group.
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114|2|2009-07-21 23:41:43|electrichandbag@yahoogroups.com|New file uploaded to electrichandbag |
Hello,
This email message is a notification to let you know that
a file has been uploaded to the Files area of the electrichandbag
group.
File : /FT-290R mk1 schematics/FT290Rmk1 schematics Part 1.doc
Uploaded by : zaktherabbit <
barfield673@... Description :
You can access this file at the URL:
http://groups.yahoo.com/group/electrichandbag/files/FT-290R%20mk1%20schematics/FT290Rmk1%20schematics%20Part%201.doc To learn more about file sharing for your group, please visit:
http://help.yahoo.com/l/us/yahoo/groups/original/general.htmlfiles Regards,
zaktherabbit <
barfield673@...|
115|2|2009-07-21 23:48:27|Martin|Re: New file uploaded to electrichandbag|
Thanks Tim for sorting the manual.
It seems that version is considerably smaller than mine, however, what may account for that is that mine includes the circuit diagrams. Ive managed to cut these and paste into a pair of word documents. Part 1 of the schematics i have just uploaded to the files area. Part 2 i will upload as soon as yahoo decides to let it work!
Martin G7MRV
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116|2|2009-07-22 12:09:11|Mansueto Grech|Re: New file uploaded to electrichandbag|
Hi,
thanks for the scans. I downloaded the file to find that, at least mine is, that page 4, the last or right hand side of the schematic, is blank. Is it some thing I am doing wrong?
Thank again.
Mans. 9H1GB
electrichandbag@yahoogroups.com wrote:
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117|2|2009-07-22 19:36:21|Martin|Re: New file uploaded to electrichandbag|
Hi Mans,
No, its not you. The schematic so far uploaded is part 1, there should be 3 pages. If you have a blank page it will be just blank lines from how i copied the images into word. The remaining sections of the schematic are in part 2, but yahoo decided not to like me uploading that yesterday, i will try again today.
Note also that the pages overlap somewhat!
Martin G7MRV
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118|2|2009-07-22 19:41:44|Martin|Re: New file uploaded to electrichandbag|
Part 2 of the FT-290R mk1 schematics now uploaded
Martin G7MRV
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119|2|2009-07-22 22:42:10|interadd|Re: New file uploaded to electrichandbag|
Martin wrote: |
120|2|2009-07-22 22:53:09|Martin|Re: New file uploaded to electrichandbag|
Congratulations, well done. Let us know when you have your callsign issued.
so, time to start studying for the intermediate...
Martin G7MRV
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121|2|2009-07-22 23:11:01|interadd|Re: New file uploaded to electrichandbag|
Martin wrote:
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122|2|2009-07-23 01:31:27|Steve|Re: New file uploaded to electrichandbag|
Congratulations Tim, keep in touch with the group.
Steve G7TAO
Sent from my iPod
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123|123|2009-07-23 08:38:38|ajfoxtrot|FT-290R Service manual?|
Hi All,
I recently discovered this group after dusting off my trusty old FT-290R after some years stored way, and wonder if anyone has a link to a service manual? (prefereably free!)
Thanks & Cheers,
Tony VK2AJF
Sydney
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124|123|2009-07-23 20:49:32|Martin|Re: FT-290R Service manual?|
Hi Tony,
Is it a mk1 or mk2?
An actual proper service manual (or technical bulletin as Yaesu seem to call them) is very rare, and ive never seen one. But, the 290 comes from an era when manufacturers still expected us to know what we were doing inside a radio, and to do much of the minor repair/realignment ourselves, so you will find that the mk1 manual recently uploaded here, along with the schematics, includes all the basic alignment procedures, as well as circuit descriptions, placement diagrams (admittedly poor) and parts lists
Do you have a fault? If so, mention it, we may be able to save you some faultfinding time
Martin G7MRV
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125|2|2009-07-23 21:37:59|Mansueto Grech|Re: New file uploaded to electrichandbag|
Hi Martin,
Yes all noted. The over large overlapping is a very goo idea as
something putting them together is very difficult. In this way both
pages can be trimmed and thus match better.
BTY. is there a PCB layout or service manual for the Mk1???
I need to make a few repairs on mine but my eyesight is not as sharp as
it used to be.... I will not write what my friend version of the cause
was, but you can imagine HI HI HI.
73's and Thanks
Mans. 9H1GB
Martin wrote:
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126|123|2009-07-24 23:35:24|Tony Farrow|Re: FT-290R Service manual?|
Hello Martin,
Thanks for the response. My rig just has FT-290R stamped on it, so it must be a Mark I. It appears to be still working OK, but in view of its age I thought I would be a good boy scout and be prepared with some documentation!
Incidentally my Word 2003 wouldn't open the first document containing the schematics at electrichandbag, but I did eventually find some schematics at
http://www.w1ngl.us/radios/ft290r/ Thanks & Best Wishes,
Tony VK2AJF
Sydney
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127|123|2009-07-25 00:31:24|Martin|Re: FT-290R Service manual?|
Hi Tony,
yes its good to be prepared. It sounds like a mk1, the mk1 and mk2 look very different! The mk1 is the type whos picture is the groups title image. I will arrange some comparison photos in the photos sections when i can
The files were made in word 97. I do think there is some compatability issue with word 2003, but later versions seem ok.
The schematics are images pasted into text boxes, so if anyone on the group is a whiz with image software and would care to stitch them into a nice jpg or the like....
Martin G7MRV
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128|2|2009-07-27 21:54:34|Bt|Re: New file uploaded to electrichandbag|
Hi martin
Got my call sign today M6VFR. Can you tell
me where the best activity is on 2 mts sideband
It's a bit quite here in rural suffolk.
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129|2|2009-07-28 00:31:42|Martin|Re: New file uploaded to electrichandbag|
Nice callsign, you'll have all the pilots envious of that! (VFR - visual flight rules)
SSB can often be very dead, until conditions pick up. 144.300 is the calling frequency, so it is best to monitor there. SSB Activity will typically be found either side of the calling frequency from 144.150 to 144.400, with various specialist modes dotted about. Above .400 up to .490 you will find propagation beacons. Try listening to .430 for the GB3VHF beacon from Wrotham in Kent.
The main thing to remember is that virtually all SSB activity is horizontally polarized, and beam antennas are the norm. You may be lucky to work locally with the whip on the radio, but you really need something horizontal. I dont know what antennas you have of course. A very simple, quick and dirty way of getting horizontal but with an omnidirectional pattern is the halo. This is what im using until i can get someone to hold the ladders! If you can get a beam up, try aiming south-east, towards holland, being in suffolk this part of europe should be within your reach
A good thing to do is to try and get involved in one of the 2m contests. These mostly use SSB and are geared towards QRP stations. There is one on 1st august. Look on the RSGB website under contests.
Above all, have fun and get on-air! Call CQ a lot (but listen a lot as well!) The more you call, the more likely you will be heard and the sooner you will make contacts
Regards
Martin G7MRV
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130|130|2009-07-28 00:35:32|Martin|/P on Yorkshire Dales tomorrow 28th|
Hi All,
I will be walking above Appletreewick on the Yorkshire Dales tomorrow, and around lunchtime i should have time to play a bit of radio. Im only taking my Alinco handheld, so will be on FM, but i will put a few CQ's out and see what happens
Martin G7MRV
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131|2|2009-07-28 14:32:37|robialbion|Re: New file uploaded to electrichandbag|
Hi Tim
Congratulations on your new callsign, get your beam sorted out and get calling!! Let me know if you want a sked into the channel islands!
73 de RobL MJ0RZD
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132|132|2009-08-11 20:46:47|kellyrichard16|Loud Clicking noise|
Hi Everyone, I am new to the group and thank you for letting me join.
I have a slight problem with my ft-290r mk1 you might be able to help me
with.
When i key and unkey the mike their is a loud click from the speaker,
even with the volume
control turned fully anti-clockwise it is still prominent. Mode
positions or different power levels
make no difference. Hope someone can offer an explanation. Thank You in
advance.
Richard (gm0grd)
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133|133|2009-08-11 22:00:48|Mick|S Meter Full Scale Deflection at switch on - AGC Problem?|
Hi,
Has anyone any experience with S Meter FSD at switch on and deaf Rx, seems to improve if left powered on for a while.
I am guessing this is an AGC problem, does anyone knowof any common causes to check?
Cheers
Mick
G1EUZ
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134|132|2009-08-11 22:03:09|Martin|Re: Loud Clicking noise|
Hi Richard, welcome to the group,
That sounds to me like there is a DC level on the speaker from somewhere. You could check for that with a meter. Be careful opeing the radio up, the speaker lead is hardwired and not very long.
Where that level is coming from though, i'll have to think about that! could be a leaky electrolytic blocking cap, whats the audio like?
Martin G7MRV
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135|133|2009-08-12 15:29:34|g3vvt@aol.com|Re: S Meter Full Scale Deflection at switch on - AGC Problem?|
In a message dated Tue Aug 11, 2009 1:00 pm ((PDT)) "Mick" mickhannam@... mickhannam writes:
Hi,
Has anyone any experience with S Meter FSD at switch on and deaf Rx, seems to improve if left powered on for a while.
I am guessing this is an AGC problem, does anyone know of any common causes to check?
Cheers
Mick
G1EUZ
Hi Mick,
There was an article in PW August 2007 in Harry, G3LLL's column on the subject with a modification to clear the problem. Also I believe ageing electrolytics can play a part in the problem. Have also seen a similar problem where this is coupled with very low FM TX power at switch on that comes normal as the radio is used. Never got as far as checking on SSB for the same problem.
Regards,
Bob, G3VVT
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136|133|2009-08-12 18:30:42|Martin|Re: S Meter Full Scale Deflection at switch on - AGC Problem?|
Mick,
if you look back through the messages on this group, you will see my account of fixing this, using Harrys method. Simply, the fix is a resistor across the AGC transistor. Its a simple fix but quite tricky to carry out. Im not too sure why it works, but it does!
Martin G7MRV
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137|132|2009-08-13 18:09:45|kellyrichard16|Re: Loud Clicking noise|
--- In
electrichandbag@yahoogroups.com, "Martin"
somewhere. You could check for that with a meter. Be careful opeing the
radio up, the speaker lead is hardwired and not very long.
could be a leaky electrolytic blocking cap, whats the audio like?
richard.gm0grd@ wrote:
join.
help me
speaker,
in
Hi Martin, Thank you for the quick reply to my problem. The recieve
audio is ok and the transmitted audio, monitored on a separate receiver
is very clear. I also noticed that the clicking noise is not heard on
the separate receiver when keying and unkeying the mic. Hope this might
help. 73 Richard (gmogrd)|
138|138|2009-08-13 18:10:24|m3snd|Telescopic antenna|
Hi group i have just picked up a 290 mk1 but it is without its internal telescopic antenna.
Can anyone suggest a place that sells the original item and how is it fitted back in?
Are there any other antennas that can fit into the same hole rubber duck type maybe or is there a mod to do this?
One of the mods posted on the net i have seen is the cap that can be cut out to increase the the highter audio frequencies of received audio;has anyone tried this mod and does it affect all audio received or just specific modes?
This is my second 290 but alas it is without a mutek front end that my first one had but i have to say its a great little rig and i am really enjoying using it.
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139|139|2009-08-15 19:51:13|kf7bsf|Looking for a FT-290|
I've been tracking this site, ebay, and several other sites trying to locate an FT-290 for sell. Does anyone have any leads or suggestions as to where I might find one of these rigs for sale?
Gene/KF7BSF
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140|139|2009-08-15 20:51:33|Martin|Re: Looking for a FT-290|
Theres several on offer now on ebay UK, the trick will be finding a seller who will ship outside the UK
Martin
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141|138|2009-08-16 15:55:48|paulallans|Re: Telescopic antenna|
Back in Dec 2002 I bought one directly from Yaesu in the USA . I called them at 714-827-7600 and ordered a Q3000020 over the phone.
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142|132|2009-08-16 16:23:42|Martin|Re: Loud Clicking noise|
just thinking, and forgive me if this sounds a bit patronising, but are your sure its not the sound of the tx relay that you can hear? Its not exactly silent on mine!
It sounds like whatever it is isnt causing any operational problems though
Martin
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143|132|2009-08-20 21:13:56|kellyrichard16|Re: Loud Clicking noise|
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144|138|2009-09-08 12:12:12|m3snd|Re: Telescopic antenna|
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145|145|2009-09-08 12:47:09|zaktherabbit|AGC fault - Its back!|
Well chaps, it seems the resistor fix for the AGC fault on the mk1, while a good simple fix, is only temporarily affective. The fault has now returned on my set.
So, when i have time, it looks like a lot of fault finding again. Perhaps now is the time to consider the global swapout of electrolytic caps!
What i would really like to do is take a dead mk1 and strip it down completely, to develop a componant position overlay to aid fault finding and repair. Unfortunatly this is my only 2m SSB radio. But if anyone else with more equipment has a dead mk1 they would be willing to donate, i'd be more than pleased to rip it to shreds for them in the name of research!
Regards
Martin G7MRV
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146|145|2009-09-08 13:41:54|zaktherabbit|Re: AGC fault - Its back!|
Quick update.
The most likely cause of this fault, is leakage, either via the electrolytic caps of the detector diodes.
The caps are easily sourced, being as they are just small electrolytics. The diodes however are obsolete. A modern equivalent of these germanium diodes should be possible, but, i have managed to source actual 1S188FM diodes. I have ordered a batch of ten, so if they do prove to be the cause, I will have a small stock of these to sell to others needing the same repair
Martin G7MRV
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147|147|2009-09-08 21:44:51|billaycock2000|Display lamp replacement|
I have an FT-690RII I want to sell or trade. Unfortunately, the front right display lamp is out. Otherwise it works fine. I prefer to offer it with the lamp working.
I would like to fix the lamp, but I need a little help.
I am not hesitant about undertaking the job, but I expect that it will go easier if I have some help. Is there anyone out there that has any tips to offer me to make the job easier or safer (for the rig)? In particular, the removal of the front to get access to the lamp is a concern.
Thanks -- Bill--W4BSG (Very new member)
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148|147|2009-09-08 22:04:25|kf7bsf@genedeal.com|Re: Display lamp replacement|
I would be interested in buying this unit. What are you asking for it?
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149|147|2009-09-08 22:07:04|zaktherabbit|Re: Display lamp replacement|
There you go Bill, maybe you wont need to risk opening it up!
I only have experience with mk1's which are very tricky to dismantle. But i think the mkIIs on the whole are much simpler
Martin
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150|150|2009-09-08 22:15:25|zaktherabbit|Buying and Selling on the group|
Hi all,
This is something i dont think we've had occur before, but can i ask that if you make a trade with anyone, that once you have decided to do so, please conduct actual negotiations over price etc off-list, as these details are not likely to be of interest to others.
I have no problem with anyone offering something to sell, or asking to buy something (so long as its FT-x90 related), indeed i will do so myself from time to time, but please keep on-list messages to things of interest to the majority.
Bill/Gene - I know ive posted this very soon after your messages, but please dont feel its directed specifically at you. Its just something ive not yet had need to consider. Your more than welcome to trade, and i hope things go well
If anyone has any comments or feelings about this, please let me know. But for now, i think the following rules make sense -
1. You can offer an item for sale so long as it is FT-x90 related
2. You can post a wanted for an FT-x90 or parts etc
3. You can respond to someone elses post
4. Actual discussions of price, shipping etc etc with a buyer/seller should be off-list
I hope this is acceptable chaps
Martin G7MRV
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151|150|2009-09-08 22:27:29|kf7bsf|Re: Buying and Selling on the group|
Martin,
I totally agree with your plan. I think we all would agree that there's a point at which a conversation/exchange should be taken off-line (or off-group). Thank for the reminder.
Gene/KF7BSF
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152|150|2009-09-08 22:30:28|zaktherabbit|Re: Buying and Selling on the group|
Thanks Gene,
didnt want to sound like i was cracking the whip! Its tricky sometimes managing a group, saying things in a way that gets across what you mean without it sounding bad
Martin
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153|145|2009-09-09 13:21:17|zaktherabbit|Re: AGC fault - Its back!|
well, im sure you all realised that was mean to say caps OR diodes!
another point to make - it has been thought that flux residue or dirt/oxidation on the pcb can cause this fault, so before trying an electronic repair, it is probably a very good idea to clean the PCB with isopropanol
Martin G7MRV
(of course, after ordering the diodes my sets come good again!)
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154|147|2009-09-09 19:16:22|Bill Aycock|Re: Display lamp replacement|
Martin
The post from Gene got to me after your general post, so I was a little
confused. Strictly speaking, that was a call for help, not an offer, but,
obviously, it had the same effect. I have replied to him, off list, because
I do agree with your position.
Thanks--Bill--W4BSG
|
155|155|2009-09-16 21:11:39|interadd@btinternet.com|Charging Nicads|
Hi Guys,
I have managed to get hold of 8 C cell 1700 ma batteries for my FT290 can anyone help me with a method of charging, 8 x 1.2 volts = 9.6 volts so i guess a mains adaptor with 9.6 volts output would do, but not sure about how many amps would be needed and how long to charge.
Also can you recommend a 10 watt amp for the ft 290, i can only go up to 10 watts output as this is limited by my licence.
Thanks in advance.
Tim
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156|155|2009-09-17 08:25:18|Geoff Blake|Re: Charging Nicads|
On Wed, 16 Sep 2009,
interadd@... wrote:
Tim, there are many ways of charging NiCd's, but you do not charge them
with a constant voltage.
The simplest way of doing it yourself is to build a constant current
charger, something like a C/10 charger. The idea is to charge the cells in
series at a current of 1/10th the battery capacity, i.e. 170mA. To fully
charge the battery will take about 14hrs from fully discharged - this
because the batteries are only about 70% efficient.
To make a constant current charger there are 100's of designs on the net,
but generally you will need to provide around 12V or more to the battery.
To provide the constant current part you could use a FET as a simple
current limiter or use a 7805 type regulator.
For faster charging, you will have to use a charge sensing type regulator,
again plenty of designs on the net. This is what I use, but I came across
a commercial unit which works equally well charging NiCd's and NimH cells.
It is a Swedich Mascot design and it was cheap enough to make it not worth
while buying a unit.
Look around for a Microwave Modules or Microset 30W amplifier, and keep
the power down. Remember you will want a 1 or 3W input version not the 10W
type.
Good luck
Geoff
--
Geoff Blake G8GNZ located near Chelmsford, Essex, U.K.
Please reply to: geoff(at)palaemon(dot)demon(dot)co(dot)uk
Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms
Please avoid sending me Word or PowerPoint attachments.
See <
http://www.gnu.org/philosophy/no-word-attachments.html -----------------------------------------------------------------
This E-mail and any attachment(s) are strictly confidential
and is intended solely for the addressee(s). If you are not
the intended recipient please notify
You may not disclose, forward or copy this E-mail or any of
its attachments to any third party without the prior consent
of the sender.
----------------------------------------------------------------|
157|155|2009-09-17 10:44:45|Geoff Blake|Re: Charging Nicads|
On Wed, 16 Sep 2009, Geoff Blake wrote:
Following up on my own post, I forgot to mention why the C/10 rate is
used. If you rapidly charge NiCd cells, when the cell is fully charged
the energy from continued charging is dissipated as heat. At C/10 a
moderate amount of overcharging will be tolerated, at (say) C/50
continuous overcharging can be tolerated, at C/0.7 (recharges the cell in
about 1 hour) charging has to be closely controlled otherwise the cell may
be seriously damaged or even explode.
Also, I missed stating that the "C" in C/10 etc is the capacity of the
cell, in your case, 1700mA/Hr. Therefore a C/10 charge rate will be 170mA.
Geoff
--
Geoff Blake G8GNZ located near Chelmsford, Essex, U.K.
Please reply to: geoff(at)palaemon(dot)demon(dot)co(dot)uk
Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms
Please avoid sending me Word or PowerPoint attachments.
See <
http://www.gnu.org/philosophy/no-word-attachments.html -----------------------------------------------------------------
This E-mail and any attachment(s) are strictly confidential
and is intended solely for the addressee(s). If you are not
the intended recipient please notify
You may not disclose, forward or copy this E-mail or any of
its attachments to any third party without the prior consent
of the sender.
----------------------------------------------------------------|
158|147|2009-09-17 12:07:28|zaktherabbit|Re: Display lamp replacement|
Hi Bill,
yes, i understood. Sorry for any confusion caused. It was just my intention to address the possibility of buying /selling, something i hadnt appreciated before. With hindsight, i should have delayed the message so as not to have jumped straight in. I certainly dont mind such posts
Regards
Martin
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159|145|2009-09-22 12:49:19|ZL1SWW|Re: AGC fault - Its back!|
Hi all,
Simon from ZL here, it's nice to see some info / activity here re FT290.
I have also go tthe dreaded AGC fault and did change the 3 electros I see in the equation. The ones I picked on were C86, C87 and C92. Changed 86 & 87 first with no apprent change but C92 improved my switchon time from 20 mins to 2mins after 3 days of no power to the unit.
Interested to see if the diodes make any difference. 1S88FM - hmm, they look like germanium diodes but have not seen any data on them. Probably need the low voltage drop..
Anyone tried lifting the emmitter of Q1017? I haven't - too hard to get at.. Lifting of the collector of Q1014 would be interesting as well.
My radio was pretty sick but now sounding pretty good otherwise. U/LSB was off so unit had total realignment. Found all oscillators off frequency. I'm getting about -118dBm for 12 dB sinad so not too bad.
Mic Audio still seems a bit thin.
Next mod will be to put a small monostable in so when I key CW line, it will pull down PTT as well for the duration of the CW work and then release after about 3/4 sec or so.
This rig will be used as a transverter driver.
Hope to hear some updates sometime.
Cheers,
Simon
ZL1SWW
www.qsl.net/zl1sww
|
160|160|2009-10-13 23:16:12|zaktherabbit|modern data modes with 290s|
Hi
Has anyone had any success with, or indeed even attempted, using modern weak signal datamodes such as JT65 or WSPR with an FT-290?
Martin G7MRV
|
161|161|2009-10-16 21:27:57|zl1ujg|FT790R (Mk1)|
Hi,
My name is Kevin ZL1UJG, a new subscriber to the group.
Just acquired a FT790R (Mk1) in almost mint condition. Only fault was it didnt work on battery. Although someone had reworked the DC connectors, it was oxidisation on the battery terminals. Also there were two (intermittent) tags on the battery holder which were behind rivets. A light scrape and some DeoxIT and its now working well on battery. I even got two sets of Batteries with it.
Useful for transverter use on the higher bands, which is one of the reasons I got it.
The review by the late G3OSS gave it a good report.(The review was in the Buyers Guide to Amateur Radio {Published in 1986})
Kevin
|
162|161|2009-10-16 22:47:05|Steve Sheriff|Re: FT790R (Mk1)|
Hi Kevin,
Welcome to the world of the FT-290 supporters group!!
You wont be disappointed with your purchase especially if you keep on top of the maintenance. Feel free to ask anything and use the resources and share anything you find out. I dare say there is more knowlege on the 290 than 790 but don't let that stop you joining in!
Steve
G7TAO
On 15 Oct 2009, at 19:20, zl1ujg wrote:
|
163|161|2009-10-17 07:41:36|zl1ujg|Re: FT790R (Mk1)|
Hi,
Did I mention I have a Ft290 Mk1 and two Mk2's...
And a raft of other elderly equipment.
What I picked up in the review was that the FT790 Mk1 has a speech processor integral with the unit. (Just a VOGAD one I suspect), but it would add a dB or 2 to weak signal work.
Has anyone experimented with speech processing with the FT290 series
I must admit I would rather spend dollars on a more basic piece of equipment than something with menu's. That's just me...
Kevin
ZL1UJG
|
164|164|2009-10-17 20:15:02|zaktherabbit|Source of microphone plugs?|
Hi chaps
does anyone know of a source of microphone plugs to fit the 290?
I intend running datamodes with mine and need access to the mic and ptt lines. The obvious way to do this is via the mic socket if i can get hold of suitable plugs
Martin G7MRV
|
165|164|2009-10-17 20:48:10|zl1ujg|Re: Source of microphone plugs?|
|
166|166|2009-10-19 20:09:11|rpcrichton|Wanted for restoration project|
Hi Group I have a Mk1 290 ,Mk2 290 a FT690 Standard C58 2m C78 70cm several TR 2300's TR 2200 TR 2200 GX
I am in need of a MK2 Carry case and strap and other accessories please if anybody has any bits and pieces in the back of a draw to spare can you think of me? also looking for a 790 all reasonable expenses met
kindest regards & best 73 Paul M1BPT JO02FV Norfolk UK
|
167|155|2009-10-19 22:28:59|rpcrichton|Re: Charging Nicads|
Tim I don't know if the Yaesu amp is 10w but the VB2200 or VB2300 are 1 watt in 10 watts out powered from a 13.8 supply
Good luck with your search Paul M1BPT
|
168|150|2009-10-19 22:29:19|rpcrichton|Re: Buying and Selling on the group|
Very Sensible Martin , Hope my question is allowed? Best 73 Paul
|
169|150|2009-10-19 22:30:35|zaktherabbit|Re: Buying and Selling on the group|
Hi Paul,
no problems with your question, thats fine
Martin G7MRV
|
170|170|2009-10-31 19:05:51|zaktherabbit|Rule change - please read|
Hi All,
As a result of recent posts, i have revised the original group rules regarding the posting of for sale and wanted posts. My original rules, upon re-reading, were a little too strict!
The new rule is as below -
IMPRORTANT NOTE - SELLING. (This is a change to the previous rules)
If you have an elctrichandbag, or its ancilliaries to sell, or you need to find a particular item, you may post a For Sale or a Wanted message. However, any actual discussions with buyers or sellers should then be carried out 'off-list'. Please dont post such things to the whole group. If you have lots of things to sell, or they are not directly relevant to these radios, use ebay or the like. Surplus to give away or 'swapsies' are ok.
If you are replying to a For Sale or Wanted, please do so directly to the original poster, not the whole group.
I hope this clears up any ambiguity (is that how you spell it?) regarding selling on the group
cheers
Martin G7MRV
|
171|164|2009-10-31 19:15:06|zaktherabbit|Re: Source of microphone plugs?|
Hi Kevin,
I had a look there, but wasnt confident that the 7 way plug listed had the correct 'geometry'
I have however found a source of the correct type. Rocket Radio in Letchworth stock them, and advertise them as suitable for FT-290s.
They have an ebay shop, which is how i ordered one. £2.55 with free posting.
I just need to build the WSJT interface unit now and see if it works on WSPR!
Martin G7MRV
|
172|172|2009-10-31 19:20:39|zaktherabbit|Great Northern Hamfest - Barnsley Metrodome 1st Nov|
Hi All,
I will be attending the rally in Barnsley tomorrow. If anyone else from the group is there, feel free to say hello. I'll have my callsign badge on, recently liberated from the RSGB convention! ALso attending should be Steve G7TAO, our moderator
Martin G7MRV
|
173|173|2009-11-01 10:29:42|tedspires|FT 290 SSB frequency error|
I have just switched on a FT 290 Mk 1 after about 15 years of storage and was delighted to find that it seemed to work fine. However, on SSB it seems to be about 2.5kHz off on Tx frequency. I picked up, on another site, that a frequent problem is that the PLL can move off frequency over time and the remedy is to retune the PLL circuit. I have been unable to locate which component needs to be retuned and wondered if anyone out there has come across this before and can advise how to go about resolving the problem. Any thoughts would be appreciated,
Ted
G7VHC
|
174|173|2009-11-01 16:43:57|Geoff Blake|Re: FT 290 SSB frequency error|
On Sat, 31 Oct 2009, tedspires wrote:
Hello Ted,
I would doubt that it will be the PLL, if the PLL moves off frequency, the
PLL control circuitry will correct the error until the offset exceeds the
range of correction. When this happens the PLL will loose lock and the
radio will cease to work.
I don't know specifically about the FT290 but most radio's flash the
readout when PLL lock is lost.
It is more likely the one of the crystal oscillators off frequency, and
most likely it is the one that "transverts" from IF to 2m. There will
almost certainly be a trimming capacitor (or inductor) for this crystal.
The alignment instructions will tell you how to adjust the crystal
frequency, but if not, switch to CW mode and tune to the frequency of a
local beacon or repeater - use one that has a reputation for being on
frequency. Then adjust the trimmer for a CW note of around 700Hz.
Alternatively, obtain the co-operation of somebody who has a SSB
tranceiver which is KNOWN to be on frequency (many are not!) and adjust
the trimmer to that that gives good sounding SSB when tuned to the right
frequency.
I am sorry I cannot be more definite, but all my FT X90's are MKII's.
73 Geoff
--
Geoff Blake G8GNZ located near Chelmsford, Essex, U.K.
Please reply to: geoff(at)palaemon(dot)demon(dot)co(dot)uk
Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms
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175|173|2009-11-01 16:44:44|ZL1SWW|Re: FT 290 SSB frequency error|
Hello Ted,
Simon from NZ here. I have a '290 Mk1 and mine was off frequency as well. I dug up a manula off the net that had the alignment details for the radio. It's part of the owners manual.
One thing I would check first is to see if FM is bang on frequency. If it is, and it sounds like maybe it is as you noted the problem on SSB only?
If SSB is bad and FM OK, I would suspect the carrier oscillators. Mine was off on USB more than LSB and made the aduio sound very thin as it would have partly been cut off by the SSB filter skirt.
If FM is bad then the PLL would need a tweak to get it right first before doing the LSB modes.
The adjustment in the manual is called SSB Carrier point adjustment. I dididn't like the procedure they used and rather just measure the carrier oscillators directly. I found tha there is enough signal to drive my HP 8920 and hopefully a sensitive counter as well if one does not have a test set. A scope probe on the case of the xtals X01 & X02 for the corresponding SSB mode L or U.
For LSB set for 10.8115MHz and USB, set for 10.8085, may as well set the CW mode as well while you are there at 10.8093MHz.
I just found the manula's way of setting was a bit arbitrary. Having done it my way, it now sounds great.
The manual is available from Mods.dk from memory.
Now just to get the AGC slow starting problem and it will be nailed!! It still works OK but have to leave it on for about 5 mins just like a valve radio to warm up. That's a really common fault and very hard to fix due to being able to access the parts in question on the board.
Hope this is of some help.
Cheers,
Simon
ZL1SWW
|
176|173|2009-11-01 22:51:42|zaktherabbit|Re: FT 290 SSB frequency error|
Simon,
what input port on your test set did you use? I have a Marconi 2955B, and also need to align the carrier point oscillator, im not sure there will be enough drive available
Ive not used by mk1 for a week, and the AGC fault has returned. I may now bite the bulet and swap out the germanium diodes in the AGC amp. Ive a few alignment jobs to do while i have the test set fired up anyway
Martin G7MRV
|
177|173|2009-11-01 23:00:56|zaktherabbit|Re: FT 290 SSB frequency error|
Ted,
Geoff is correct that the PLL is unlikely in itself to be at fault, however the reference oscillator for the PLL may well be out, this will be the case if FM as well as SSB is off frequency. Be sure to check this once the radio has had time to warm up, and check it is stable on a longish over! Tx can be off by several hundred Hz on FM with no noticable effect, but even a few 10s of Hz is obvious on SSB.
As Simon said, check the PLL reference is on-frequency using FM first, before moving onto the SSB CIO's. Its also worth, while you have the rig open, checking such things as FM deviation etc, and giving the rx front end a quick once-over as well
Martin G7MRV
|
178|173|2009-11-02 11:20:22|ZL1SWW|Re: FT 290 SSB frequency error|
Hi Martin,
On the 8920 it has two inputs, one which is high power and has a beefy attenuator inside depending on the power level option you have, the other port labelled "Ant In' is sensitive and can only take a max i/p power of 200mW. I used a 100MHz scope probe and jsut touched it on the crystal case, the unit is sensitive enough to pickk this up and can measure with the counter option in it.
Don't know about the 2955, but on the HP, you can set it to manual, key in the wanted frequency and then look at the input frequency error and go for zero. In some cases this is the best way to go on real weak stuff as it will lock on better. most of my equipment is locked to a GPS refernce at 10MHz so it's pretty accurate.
Good luck on the AGC, Let us know if you have any breakthroughs! Mine is better since I changed the caps and having been off for a month, it will now power up in about 4 minutes.
Cheers,
Simon
ZL1SWW.
|
179|173|2009-11-02 13:08:08|zaktherabbit|Re: FT 290 SSB frequency error|
I had a look online at the spec of the HP8920, its quite a bit more capable than the Marconi 2955. The Marconi doesnt have a spectrum analyser or sweep generator, doesnt work on plain SSB, and unless you have the right option (i dont!) it has no inbuilt high sensitivity receiver. That said, i got it surplus along with a Bird 43 and some other bits for £50! cant really complain! Its lowest input is a 1W port, i will try it on that. Just as for your HP, setting the frequency and using the offset indication is best for weak inputs. If all fails, im sure i can add another BNC somewhere direct to the counter input.
Im thinking of a three pronged attack on the AGC - swap the diodes, swap the elctrolytics, clean the PCB with isopropanol or electrowash. If it clears the fault, it will give a choice of three cures!
Martin G7MRV
|
180|180|2009-11-02 15:11:25|zaktherabbit|AGC repairs - the saga continues...|
Hi Guys
I have just uploaded some photos showing my repair work on replacing the two AGC detector diodes.
The radio is now undergoing a powered soak-test, prior to oscillator alignment (a trick i learnt in the repair industry - always allow a radio plenty of time to warm up before working on it, this also gives time for another brew)
A few hints for those intending to try these repairs -
1. Invest in a good low power, fine tipped iron, i use an Antex 18W iron, and a roll of medium width desoldering braid/wick. Dont try and remove these parts with a solder sucker! Also, learn the knack of freeing the part leg after using braid with a gentle push sideways (not downwards!) with a hot iron. The part should then gently lift out with a pair of pliers or tweezers.
2. Remember that the power leads for the battery pack go to large terminals, so use a more powerfull iron on those only, i use a 45w iron.
3. Take the time while the radio is open to inspect it thoroughly for dry (cold) joints, and correct these as you find them. Such faults are notoriously intermittent!
4. Clean off flux after soldering with a suitable non-residue cleaner.
Of course, whether changing these has fixed the fault i wont be able to say until its had plenty of time to actually fail again!
Martin G7MRV
|
181|181|2009-11-02 18:44:27|zaktherabbit|Opinion please - 'Freecycle' type ham radio group idea|
Hi all,
following a number of occasions, especially on this group, where requests for help have resulted in kind offers of needed parts, i have been considering the idea of setting up a group whose sole purpose would be to offer, request, and swap junk box items.
This would be based, loosely due to the broader reach, on the successful 'freecycle' network, which im sure many of you are familiar with. For those who are not, this is a network of local groups which allow Offered and Wanted posts, on the strict proviso that no money changes hands for any items.
It occured to me a similar scheme for us radio hams, especially those of us who like to build and repair, would be valuable in finding rare or unusal parts, and clearing out those junkboxes! However, because it would be national, not local, the rule regarding no monies would have to be limited to the item only, with postage perhaps paid but at cost. Ideally though of course exchange would be made wherever possible in person, especially for larger items.
I have talked to the Freecycle organisers, and although i cannot use the freecycle umbrella due to the groups nature, they were very supportive and gave permission to use their styles and rules, with some modification.
I would like to know peoples opinions on this idea please, and especially if anyone is aware of such a scheme in the UK already! I intend to set up the group shortly, and the more members we can get quickly the sooner we can become established.
Regards
Martin G7MRV
|
182|180|2009-11-02 18:46:20|zaktherabbit|Re: AGC repairs - the saga continues...|
Further to this, I carried out some alignments, and the radio is now back in the shack monitoring 144.300. So far though, sadly, theres been no activity, and with my current little halo im not able to get GB3VHF either. Unless of course, its because ive broken it in the process!
It did in fact turn out to be impossible to detect the CIOs with the 1w port of the Marconi. I really do need a proper stand alone counter!
Ive got a sked this evening with G7PZL though to give it a check out.
Martin G7MRV
|
183|181|2009-11-02 21:06:07|Geoff Blake|Re: Opinion please - 'Freecycle' type ham radio group idea|
On Mon, 2 Nov 2009, zaktherabbit wrote:
Hi Martin,
There is a group "HamFreeCycle" or something like that which is mainly
USA based but allowed me to join from the UK.
To set a UK version up will, I think, be a good idea and you have my
support.
Geoff
--
Geoff Blake G8GNZ located near Chelmsford, Essex, U.K.
Please reply to: geoff(at)palaemon(dot)demon(dot)co(dot)uk
Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms
Please avoid sending me Word or PowerPoint attachments.
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184|184|2009-11-02 21:41:52|gi0gdp|SSB Freq|
L3007 which tunes the PLL mixer oscillator probably needs an adjustment, there is hole in the PLL tin box lid to ease this adjustment (the one nearest to the memory select switch).All of this info is in the 290 manual.
Good luck.
Geoff GI0GDP
|
185|184|2009-11-02 23:06:07|Ted|Re: SSB Freq|
Thanks for the suggestions everyone, I will have a go at sorting this out and let you know the result. Don't like to ask about the agc problem which has been included in some of the comments - hope I don't have it.
Ted
|
186|184|2009-11-02 23:38:52|zaktherabbit|Re: SSB Freq|
Good luck with it Ted,
make sure you have a suitable non-metallic trimming tool for the core, its a small slot and a bit fiddly to get exactly on frequency
My set is still off on SSB, despite the work i did earlier. Its taken me until now to verify it on-air, theres been no activity at all today! However my mate Andy confirmed it sounds good and clean on both USB and LSB, and is spot on on FM, just the carrier oscillators are out on both sidebands, making me have to tune quite a way out!
I wouldnt worry about the AGC Ted, if you had the fault you would already know!!! If your radio works as soon as you turn it on, your fine. If you have to wait 30sec, 5min, half hour or more, you have the AGC fault!
Martin G7MRV
|
187|184|2009-11-03 00:30:36|Geoff Blake|Re: SSB Freq|
On Mon, 2 Nov 2009, Ted wrote:
Ted,
One point that you may not be aware of. How do you define the SSB or CW
frequency. In the case of FM or AM - carrier modes - there is a carrier
there to measure and the frequency of the carrier is - well - the
frequency of the carrier.....
--
Geoff Blake G8GNZ located near Chelmsford, Essex, U.K.
Please reply to: geoff(at)palaemon(dot)demon(dot)co(dot)uk
Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms
Please avoid sending me Word or PowerPoint attachments.
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http://www.gnu.org/philosophy/no-word-attachments.html -----------------------------------------------------------------
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188|184|2009-11-03 12:09:39|Geoff Blake|Re: SSB Freq|
On Mon, 2 Nov 2009, Geoff Blake wrote:
Sorry, the above got away, it was not intended to be posted "as is".
I was going on to say that on SSB some manufacturers define the
transmitted "frequency" as being the centre frequency of the transmitted
signal, i.e. typically 1.5kHz above or below (LSB) the carrier frequency.
Geoff
--
Geoff Blake G8GNZ located near Chelmsford, Essex, U.K.
Please reply to: geoff(at)palaemon(dot)demon(dot)co(dot)uk
Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms
Please avoid sending me Word or PowerPoint attachments.
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189|180|2009-11-07 01:26:23|zaktherabbit|Re: AGC repairs - back to the bench...|
hey-ho! after all that hard work - turned on after only being off overnight, and bang, straight to FSD! Takes about 15sec to come good, although the last time i checked it it came down to half scale then went back up!
So, changing the diodes has had no effect, pity, as ive another 8 left!
The next task then will be a complete clean of the unit with isopropanol. Im halfway through building the new workshop bench, so should have somewhere decent to work soon
How very annoying!
Martin G7MRV
|
190|180|2009-11-07 02:18:42|zaktherabbit|Re: AGC repairs - back to the bench...|
Ive just been searching the 'net for anything on this fault i may have missed. Surprisingly, i came across an entry on a thread on eham i was involved in regarding this problem -
http://www.eham.net/forums/ModsAndRepairs/6573?page=2 the poster says a hardware reset cleared the fault on his! I cant actually believe it would, has anyone tried it?
I'll give it a go on mine tomorrow, but i dont hold any hope! I think its going to be a case of alternate local heat sourse/freezer spray to finally trick this little critter down, unless the wash works
as a side note, this occurs on switch on, so im going to try warming the pcb before turning on to see what happens!
Martin G7MRV
|
191|180|2009-11-09 13:29:03|g3vvt@aol.com|Re: AGC repairs - back to the bench...|
Hi Martin,
I presume you have tried the modification put forward by Harry Leeming, G3LLL as published in PW August 2007 to cure your problem?
Regards,
Bob, G3VVT
|
192|180|2009-11-09 19:37:46|zaktherabbit|Re: AGC repairs - back to the bench...|
Hi Bob, yes Harry's fix was the first i used, worked for quite a while. Its more a medicine, treating the symptoms, though. IT now seems time to find the cause of the trouble and eliminate it directly.
For some reason, and i havent tested it out yet so this is purely theoretical, my intuition is guiding me toward the regulators!!! I wont know of course until i can stuff the thing full of probes and monitor the fault properly
Martin G7MRV
|
193|193|2009-12-03 09:41:30|xzs5ham|Battery Box|
I have just bought an FT690 MK II minus the battery box - wonder if anyone has a spare they could flog me? Guessing this the same for all handbags Mk I & II's 290/690/790 - somebody please let me know it there's a difference.
Not too worried about condition as long as it clips on ok - I can fix corroded connections & have Araldite & paint to hand if needed!
Cheers, Jerry G4GGZ
|
194|193|2009-12-03 10:22:43|Geoff Blake|Re: Battery Box|
On Thu, 3 Dec 2009, xzs5ham wrote:
Jerry,
The removeable battery box is shared between the FT290RII, the FT690RII
and the FT790RII. The battery box is NOT suitable for use on the MKI
versions which have a integral battery holder.
Some three or four years back I needed to replace a MKII battery pack and
had great difficulty in sourcing a replacement.
Good Luck
Geoff
--
Geoff Blake G8GNZ located near Chelmsford, Essex, U.K.
Please reply to: geoff(at)palaemon(dot)demon(dot)co(dot)uk
Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms
Please avoid sending me Word or PowerPoint attachments.
See <
http://www.gnu.org/philosophy/no-word-attachments.html -----------------------------------------------------------------
This E-mail and any attachment(s) are strictly confidential
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----------------------------------------------------------------|
195|180|2009-12-04 00:37:58|zaktherabbit|Re: AGC repairs - Regulators???|
Out of interest, has anyone done any testing around the voltage regulators regarding the AGC fault?
Im being drawn to the idea of a cap or semiconductor in this section being at fault.
I now have the necessary materials (isopropanol and freezer spray) to get to work properly on this just as soon as i have time
Martin G7MRV
|
196|196|2010-01-14 10:41:56|mw0cvt|Charging|
Hi all
Can anyone tell me what is the voltage and current output of the original NC-11C charger for the FT-290R MK1.
Thanks
Rob
|
197|196|2010-01-14 15:58:07|Geoff Blake|Re: Charging|
-----Original Message-----
From:
electrichandbag@yahoogroups.com [mailto:
electrichandbag@yahoogroups.com] On Behalf Of mw0cvt
Sent: 14 January 2010 00:10
To:
electrichandbag@yahoogroups.com Subject: [electrichandbag] Charging
Hi all
Can anyone tell me what is the voltage and current output of the original
NC-11C charger for the FT-290R MK1.
Hi Rob
I don't know about the original charger, but my "type specific" charger is
14V and 140mA constant current.
However I generally use a dV/dT type fast charger which charges up to 11
NiCd's or NimH. A 4000mA/hr pack takes around 2hr to charge fully from flat.
Geoff
--
Geoff Blake G8GNZ located near Chelmsford, Essex, U.K.
Please reply to: geoff(at)palaemon(dot)co(dot)uk
Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms
Please avoid sending me Word or PowerPoint attachments.
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This E-mail and any attachment(s) are strictly confidential
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198|196|2010-01-14 16:40:36|mw0cvt@aol.com|Re: Charging|
Thanks Geoff for the info, I will have a look in my junk box for something close to that
73
Rob
MW0CVT
|
200|196|2010-02-06 06:53:09|kf7bsf|Re: Charging|
My FT-290RII uses an NC 26B rated for 13.05VDC at 165mA.
73 Gene KF7BSF
|
201|139|2010-02-06 07:30:30|kf7bsf|Re: Looking for a FT-290|
After keeping my eyes on e-bay for months, I finally found an FT-290RII that met my needs. I spent a little more than I planned, but it arrived today. Inside the shipping box was an original Yaesu box and in there every piece originally sold with radio including all the manuals, spare fuses, and even the plastic bags. This unit looks brand new!
The only wear I can find are a few scratches on the bottom and a very small amount of corrosion in the battery box on one terminal which cleaned up rather nicely.
I'm looking forward to getting the unit on the air tomorrow.
73 Gene/KF7BSF
|
202|139|2010-02-07 09:01:09|kf7bsf|Re: Looking for a FT-290|
Built a power cable today and made my first qso on the FT-290. Reports were quite positive.
The only issue I have is that the battery pack is not functioning properly. I found some corrosion in the battery case and the output voltage from 9 new 1.6 volts cells is barely 9V and drops quickly eve when testing with a VOM. I'll try cleaning up the connections in the case and retest.
Anyone else have these battery case issues?
Gene/KF7BSF
|
203|139|2010-02-07 20:26:49|zaktherabbit|Re: Looking for a FT-290|
Gene,
are you able to test the cells outside of the radio? Ive had corroded terminals and the extra resistance has reduced the available operating time but ive never noticed the voltage fall that fast, and certainly not when just on a VOM. It sounds to me like one of the new cells is a dud.
You say 1.6v cells, are these alkaline cells? Thta shouldnt make any difference in fact the measured voltage of the pack should be higher than with NiCd/NiMH cells.
Remember also that the external power connector acts as a switch to disconnect the batteries, this could need a clean (spray of contact cleaner)
Martin G7MRV
|
204|139|2010-02-08 06:28:07|kf7bsf|Re: Looking for a FT-290|
Martin,
I tested each cell individually they are all good and show stable voltage. I installed the c-cells into the battery pack and tested the power at the main battery contacts. The battery pack was NOT installed during testing, nor was any power cable plugged in.
My first test was zero volts. I remove the battery pack with the cells still in place and tested each cell individually from the positive terminal to the battery case contacts that contact the cells in the other case half. I checked the cells individually in both case halves.
All cells but one showed the same voltage when tested before installation. The contact/cell that had no voltage reading revealed some corrosion, so I cleaned it up. It appears that there is considerable resistance between the tension/contact spring and the rivet holding it in place. After a good cleaning I was able to get a fairly consistent reading.
I reassembled the unit and tested the power at the main contacts. The voltage was only 9v. I believe this is a marginal voltage at best and it was here that I noticed that the VOM would cause a drop in the voltage. I attached the battery case to the radio and there wasn't enough voltage to power the unit.
I proceeded to build a power cable to connect the FT-290 to my HF power supply and verified that the unit is working. I've spent most of today learning to program and operate the unit. The FT-290 is in great shape and functions very well.
I have ordered another battery pack. I was fortunate to find an NOS battery pack and FL-2025 online from another ham. They were pretty expensive (relatively speaking), but I couldn't pass up the chance to buy these NEW! :)
The defective battery pack will need to have the corroded rivet replaced or repaired in some way or replaced with an appropriate fastener. I should also run some test on the circuit controlling the charging/disconnect to make sure there is no damage there. If necessary I can use the old unit to attempt to build a NiHM cell pack.
If you can direct me to a schematic of the charging/disconnect circuit that would be my next step. I don't think I have a schematic for that unit.
Thanks for getting back to me. I'm excited to be an active part of the group. Now I need to get a tone board and some instructions for the MH-15 mic.
73 de Gene/KF7BSF
|
205|205|2010-02-08 06:31:25|kf7bsf|Desk mic for the FT-290|
Does anyone use the FT-290 as a base station? I'm interested in getting a desk mic for station operation. I have a nice Kenwood MC-60 that I might be able to adapt. Any information?
73 de Gene/KF7BSF
|
206|139|2010-02-10 17:11:02|zaktherabbit|Re: Looking for a FT-290|
Sorry Gene, i misread your post, didnt realise your using a mk2, my info was for a mk1.
It does sound like the rivet, so shouldnt be too hard to fix.
Martin
|
207|139|2010-02-10 18:10:51|kf7bsf|Re: Looking for a FT-290|
Martin,
Sorry if wasn't clear about that. Is there a significant difference between the battery pack on the mk 1 and mk 2?
Gene/KF7BSF
|
208|139|2010-02-10 18:34:14|Geoff Blake|Re: Looking for a FT-290|
Hi Folks,
I have been following this thread out of interest.
One thing that I spotted was the line " I proceeded to build a power cable
to connect the FT-290 to my HF power supply and verified that the unit is
working. " This worried me a little, if you connect the battery directly to
a "HF power supply" (presumed to be ~13.8V @ 22A or so) it is likely that
you could damage/destroy the batteries.
Refurbishing the MkII battery packs - I have three! - the spring to rivet
junction can be problematic but normally surrenders to persistent cleaning.
I have replaced the dead NiCd's in two of the packs with NimH cells. I use a
four stage intelligent charger to recharge the batteries.
Geoff
-----Original Message-----
From:
electrichandbag@yahoogroups.com [mailto:
electrichandbag@yahoogroups.com] On Behalf Of zaktherabbit
Sent: 10 February 2010 15:10
To:
electrichandbag@yahoogroups.com Subject: [electrichandbag] Re: Looking for a FT-290
Sorry Gene, i misread your post, didnt realise your using a mk2, my info was
for a mk1.
It does sound like the rivet, so shouldnt be too hard to fix.
Martin
.--
Geoff Blake G8GNZ located near Chelmsford, Essex, U.K.
Please reply to: geoff(at)palaemon(dot)co(dot)uk
Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms
Please avoid sending me Word or PowerPoint attachments.
See <
http://www.gnu.org/philosophy/no-word-attachments.html -----------------------------------------------------------------
This E-mail and any attachment(s) are strictly confidential
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You may not disclose, forward or copy this E-mail or any of
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209|139|2010-02-11 00:27:25|kf7bsf|Re: Looking for a FT-290|
Geoff,
I was referring to the cable required to power the radio via the 12v dc port, NOT through the charger port. I needed to build the 12v power connector to verify that I had a working unit. However, I was surprised these ports where located so close together which would definite make for nasty accident.
The rivet in my battery case is damaged (as in about 1/3 of it is missing). It will definitely need to be replaced at some point. I haven't tried to refurbish anything yet since a have a new pack on the way. I've been spending most of my time just enjoying my new acquisition. This is really a fine little radio!
I would be very interested in learning more about your NimH setup, especially the charger. I like the idea of converting the case and taking advantage of the Nimh technology. Did you purchase a 4 stage charger or build your own?
Gene/KF7BSF
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210|139|2010-02-11 13:00:05|Geoff Blake|Re: Looking for a FT-290|
-----Original Message-----
From:
electrichandbag@yahoogroups.com [mailto:
electrichandbag@yahoogroups.com] On Behalf Of kf7bsf
Sent: 10 February 2010 22:26
To:
electrichandbag@yahoogroups.com Subject: [electrichandbag] Re: Looking for a FT-290
port, NOT through the charger port. I needed to build the 12v power
connector to verify that I had a working unit. these ports where located so close together which would definite make for
nasty accident.
Hi Gene, group,
Sorry if I inferred that you had connected the batteries to the PSU, I was
more concerned that somebody else may do so and thus damage the cells. I am
sure that you are aware that the cells may "decompose" violently when
subject to excessive high current charging. Incidentally, the three radio's
that I have are a FT290RII, a FT690RII, and a FT790RII, and I know very
little about the Mk I battery arrangements.
missing). It will definitely need to be replaced at some point. I haven't
tried to refurbish anything yet since a have a new
acquisition. This is really a fine little radio!
Yes, I like all three of mine! I mainly use my 290 and 790 as drivers for
microwave transverters although I now have a FT817 which has a number of
advantages. I don't know if you have a boot and shoe repairer locally, if
so, they may be able replace the rivet.
especially the charger. I like the idea of converting the case and taking
advantage of the Nimh technology. Did you
I did nothing special to use NimH cells, just replaced the missing NiCd's.
The main reasons for choosing NimH''s was that they were cheaper and had the
higher capacity 4000mA/hr. The charger was left over from a work project and
was marketed by a Swedish Company "Mascot" . At least one poster here has
suggested that it is cheaper to buy a switched mode multi stage charger than
to make one! I also have a 145mA constant current charger (came with one of
the radios) which I have to time manually.
Geoff
--
Geoff Blake G8GNZ located near Chelmsford, Essex, U.K.
Please reply to: geoff(at)palaemon(dot)co(dot)uk
Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms
Please avoid sending me Word or PowerPoint attachments.
See <
http://www.gnu.org/philosophy/no-word-attachments.html -----------------------------------------------------------------
This E-mail and any attachment(s) are strictly confidential
and is intended solely for the addressee(s). If you are not
the intended recipient please notify
You may not disclose, forward or copy this E-mail or any of
its attachments to any third party without the prior consent
of the sender.
----------------------------------------------------------------|
211|139|2010-02-11 18:01:25|kf7bsf|Re: Looking for a FT-290|
--- In
electrichandbag@yahoogroups.com, "Geoff Blake"
I used to do a bit of leather repair and have the tools necessary to replace the rivet. It's good to hear that this works as a repair. I will document my repair and post the results for others.
My net-search has indicated that the multi-stage charger is the way to go. I'm trying to locate one that can be fitted for the battery pack in the factory fashion. The initial investment may be a bit higher, but I think the Nimhs will pay for themselves rather quickly.
Thanks for the feed back. It would appear that most of the users here are from Great Britain! Is that true? I'm just wondering why the FT-290 and it's siblings are so much more popular there.
72 de Gene/KF7BSF|
212|212|2010-02-14 22:12:50|kf7bsf|Some Mk2 questions and comments...|
Group,
I am certainly enjoying the Mk2. Working SSB on 2 meters is quite fun. I'm looking forward to exploring more and getting a horizontally polarized antenna to see if I can get out a bit further.
Questions:
1) Does anyone have a spare shoulder strap kicking about?
2) After installing the FL-2025 I am seeing some odd behavior in the power output. On FM simplex I can clearly see the power level change on my external SWR/Power meter when switching from high to low power, but on SSB/CW I see no power output on my meter regardless of the power level setting. On-the-air reports definitely notice the difference, so I'm certain the amp works, but I'm puzzled that I'm getting no reading on the meter.
Can anyone explain this? Has anyone else noticed this behavior?
73 de Gene/KF7BSF
|
213|212|2010-02-15 06:09:40|kf7bsf|Re: Some Mk2 questions and comments...|
|
214|212|2010-02-15 10:00:21|Geoff Blake|Re: Some Mk2 questions and comments...|
|
215|215|2010-02-19 07:59:58|kf7bsf|Programming Tone Boards|
At the risk of being a one man user group I have another question.
I received my FTS-7A tone board today and I've read the manual through several times, but I have one question for which I cannot find a straight forward answer.
Am I limited to a single tone among all the tones or is there some way that I can program different tones for different frequencies in memory?
I realize that compared to today's modern radios that the FT-290 may not be the best choice for repeater use(and I do have a another 2 meter radio), but I do have a few repeaters I would like to operate on with the 290 and as luck would have it the tones are never the same.
Any help is appreciated. Gene/KF7BSF
|
216|139|2010-02-24 17:23:53|david269140|Re: Looking for a FT-290|
They are quite popular for a number of reasons. In no particular order.
The FT-290 is relatively cheap and a good starter rig for ssb/cw/fm.
Many were (and possibly still are) used for portable microwaving as a driver for a 10GHz transverter. Many references can be found in microwave newsletters and the FT-290.
There are five RSGB 'backpacker'144MHz contests held throughout the year in the UK. Maximum power 3W output.
Also the Practical Wireless 144MHz contest - also 3W output.
The FT-290 is often quoted as being ideal for these contests.
73 David G4ASR
|
217|217|2010-03-12 17:01:37|kf7bsf|Wanted FT-690RII Power Amp|
Anyone out there have an FL-6010 Power amp for an FT-690RII? Note this is a Mk2 model so it's the 20watt amp that clips on the back of the radio in place of the battery pack.
Gene/KF7BSF
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218|218|2010-03-12 23:18:34|g1drp|Mutek front end....do they make any difference?|
Hi All,
I have 2 Ft290 MK1s. One has a Mutek front end, the other doesn't. there is only a very small difference in sensitivity between the two. Was the Mutek front end just meant to improve the dynamic range of the receiver?
Cheers,
Ian G1DRP
|
219|218|2010-03-13 14:26:19|gi0gdp|Re: Mutek front end....do they make any difference?|
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220|218|2010-03-13 20:23:31|g1drp|Re: Mutek front end....do they make any difference?|
Hi Geoff,
Just by comparison on SSB and FM. Since changing my job 4 years ago, I have not had access to any decent RF test gear.
Cheers,
Ian G1DRP
|
221|221|2010-03-21 01:37:22|kf7bsf|FTS-7 Mismatched connectors!|
Had planned to install the FTS-7 Tone Board in my FT-690RII today, but discovered that the connector in the radio is different than that on the tone board.
Has anyone encountered this?
Looking at the tone board, it has the same connector as my FT-290RII with the tapered corners on the IC side of the connector. I was under the impression that these unit take the same FTS-7 Tone Board.
The FT-690RII has a rectangular connector with all the pins that slide "across" each other, while the Tone Board has pins that insert "into" the cable connector.
Any clues would be helpful.
73 de Gene/KF7BSF
|
222|222|2010-04-03 00:24:06|kf7bsf|Looking for a FT-790RII|
I'm looking for a FT-790RII. Anyone have one?
|
223|223|2010-04-03 23:37:31|g1drp|FT290R MK1 for sale|
I have 3 FT290R radios for sale as one lot.
One is in good condition with a Mutek front end and mic.
One is very nice with original mic and manual.
One is tatty with no telescopic antenna but has mic and manual.
Asking £125 for all three. Payppal or bank trnasfer.
73,
Ian G1DRP
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224|224|2010-04-03 23:37:32|g1drp|FT690R for sale|
Tidy FT690R MK1 with mic for sale. £75. Paypal preferred.
73,
Ian G1DRP
|
225|223|2010-04-04 00:11:39|ALLENCrdr@aol.com|Re: FT290R MK1 for sale|
Hi Ian
Would you have any idea of the postage cost to Dartford in kent.
Regards
Allen
M1cxk
|
226|223|2010-04-04 19:36:22|g1drp|Re: FT290R MK1 for sale|
Hi Mick,
£10 by Standard Parcels with suitable insurance.
Cheers,
Ian G1DRP
|
227|222|2010-04-05 11:26:01|Bill Aycock|Re: Looking for a FT-790RII|
SORRY-- BIG mistake-- I have a 690 !
Bill--W4BSG
--------------------------------------------------
From: "kf7bsf" <
kf7bsf@... Sent: Friday, April 02, 2010 5:21 PM
To: <
electrichandbag@yahoogroups.com Subject: [electrichandbag] Looking for a FT-790RII
|
228|222|2010-04-05 11:26:34|Bill Aycock|Re: Looking for a FT-790RII|
I have one. It works, has the Amp, Antenna and Battery box, but no mobile
mount. I might sell it, but don't know an appropriate price.
Bill--W4BSG
--------------------------------------------------
From: "kf7bsf" <
kf7bsf@... Sent: Friday, April 02, 2010 5:21 PM
To: <
electrichandbag@yahoogroups.com Subject: [electrichandbag] Looking for a FT-790RII
|
229|215|2010-04-05 18:42:32|Kevin|Re: Programming Tone Boards|
Hello Gene
I have checked out the manual for the mk2 and as far as I can see the FTS-7 tone board only allows one tone at a time to be generated as the output tone is set by the array of seven DIP switches all of which are used to set one tone. The memories and the call button only call this preset frequency as required.
So sorry to say Gene I think you are stuck unless the repeaters also use DTMF codes which you could input via the mic ie the Yaesu MH-15C8 or similar.
Best regards
Kevin G6UCY
|
230|221|2010-04-07 23:41:49|Kevin|Re: FTS-7 Mismatched connectors!|
Hello Gene
I think I might have the answer to your question. Amongst the paperwork the came with my new Mk2 today was a notice from Yaesu which dealt with the tone squelch units on the mk2. The notice said that due to the original connectors becoming prematurely obsolete Yaesu had to fit new ones that were not compatible. The units with the new connector were called FTS-7A
The notice said to fit the FTS-7A to make sure that the last six digits in the serial number are above those listed below
FT-290RII 300000
FT-690RII 290000
FT-790TII 140000
Units with serial numbers below those listed need the original FTS-7.
Hope this proves helpful
Best regards
Kevin G6UCY
|
231|221|2010-04-08 16:16:51|kf7bsf|Re: FTS-7 Mismatched connectors!|
Kevin,
That makes perfect sense. So I guess my question now is this: Did anyone make an adapter? If not I can try to work a trade I suppose to get the non-A model tone board.
Thanks for a thorough response.
Gene/KF7BSF
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232|232|2010-04-13 14:24:27|davidg4irq|CTCSS for FT290 Mk 1|
Having bought a 'fixer-upper' recently, I realised that the main shortcoming of the FT290 Mk1 is the lack of CTCSS for repeater use.
Following a web trawl for something suitable, I came across the following circuit which uses a PIC to generate the tones. The clever part is that it uses the 12-way memory switch to select the required tone from the front panel, so there is no need to keep opening up the rig when you need to change tone.
The original article refers to installing it where my radio has its Mutek board, but it is possible to fit it in front of the memory back-up battery if you use small components and careful design.
Hopefully this will be of interest to Mk 1 owners who would like a CTCSS facility.
The link to the article is:
www.spikey-mike.com/radio/ctcss.html
If you don't have access to a PIC programmer, I may even be persuaded to program the PIC for you if you can supply the chip and suitable pre-paid return packaging. (I may live to regret this!)
73 de David Bobbett, G4IRQ
(Oh - and apologies if this has been posted before)
|
233|233|2010-04-13 19:51:38|Gordon JC Pearce|Hello, and help!|
Hi list,
I picked up an FT-290R at a rally at the weekend, which is is pretty
reasonable condition physically (few wee scratches, battery contacts a
bit scabby) and transmits and receives very well. However, the display
isn't saying anything sensible - usually just a backwards "F" in the
middle. I did a quick search around the 'net, and tried cleaning up the
contacts and rubber strip. This didn't help matters. I searched the
archives of this list, and found that someone else had a similar problem
that turned out to be the chip on the display PCB.
So, my questions are this - how likely is it that the display driver
chips fail? Is it possible that something like the lithium battery
failing could cause these symptoms?
I tried the radio out on air by setting the frequency with my frequency
counter. I'm only a few miles from my local 2m repeater, so the
internal whip aerial got me into it and I was able to have a couple of
QSOs with some of the usual repeater locals. The audio on receive and
transmit sounds phenomenal. I just want to be able to see where I'm
going...
Thanks
Gordon MM0YEQ
|
234|233|2010-04-13 23:08:24|G4IZS|Re: Hello, and help!|

Hi Gordon,
I guess I might be the person who had a driver chip fail!
The LCD was perfectly fine - the battery was fine - the transceiver was fine, worked as you describe and had never been abused. I could see the data being sent to the driver chip but nothing sensible emerged. All connections were checked on both "sides" of the chip.
When I replaced the chip all worked as one would hope. I can only surmise the chip died ....
As it happens I was a Reliability Engineer in my working days. One thing I did was to predict chip failure rates (and use this data to tell the authorities if it was safe to fly in passenger aircraft, for example). While there is "black magic" involved in the process it does rely on science and the physics and chemistry of failure. Yes, it is perfectly possible for a chip to fail without apparent cause, but if you look inside there are many reasons why chips fail. They do not even have to be powered for failures to arise. I would predict a random failure rate of maybe 10 failures per million hours for that chip, so, ever so roughly, maybe 1 radio in 50 might suffer the fault (remember, ever so roughly), but if there is a weakness in its design/manufacture this number could be much, much worse. Since there are no records of the performance, no-one will know if I am right or wrong!
I found a scrap radio and further sacrificed it. The repaired radio still works.
73
Ron, G4IZS
|
235|233|2010-04-17 23:35:48|Gordon JC Pearce|Re: Hello, and help!|
On Tue, 2010-04-13 at 21:35 +0100, G4IZS wrote:
It was indeed ;-)
Do you have any information on the chip? Possibly even a data sheet?
There doesn't appear to be a lot connecting it to the CPU; maybe I can
figure out something suitable.
I suppose the first thing to try is to see if I can find a display,
display PCB or even just the chip. After that, well... maybe devise
some sort of replacement. A microcontroller and some sort of really
small LCD from a phone, possibly.
Are dead LCD controllers a common problem in the IC-[267]90 family?
Gordon MM0YEQ
|
236|233|2010-04-18 09:20:37|G4IZS|Re: Hello, and help!|

Hi Gordon,
I believe I did find some information on the chip but do not have it now. No, not much connects the chip to the CPU.
Have you checked the control lines from the microprocessor are not compromised? Use a 'scope and check both ends of the lines and put the probes lightly onto the "shoulders" of each chip. If one or more lines are not active then lift the connecting wire and make sure ... You can buzz through the lines to the LCD itself but make sure you use a low voltage device, and probably you should avoid using a conventional multimeter.
I am certain there are several ways of resurrecting the display function, but would they "fit" the case? It would be fairly easy to do something on the outside. I believe the best way is almost certainly to locate a (hopefully) inexpensive, damaged or otherwise not working 290 and hopefully you might find a good decoder chip inside.
Before you do any of this are you certain the processor chip is indeed working well, the transceiver on frequency and so on? If there is more than one fault .....
I have no knowledge at all concerning the longevity of chips in the family. I do know they were manufactured at a time when the life of chips was suspect. (Incidentally it is probably worse today.)
I would imagine you could program a PIC to substitute for the decoder chip itself, or maybe better, the microprocessor and decoder at the same time. You might then be tempted to provide the code to the rest of us!
73,
Ron, G4IZS
|
237|237|2010-04-19 14:20:12|telemech46|AGC Problem|
My FT290 has been showing the symptoms of the AGC problem for a while, where after so long the s meter drops back to normal. The other week it stayed across at FSD, and would not recover however long you waited. I tried a micro reset, as descibed in the user manual, and it has now cleared this fault. The reciever works fine, and I can here the angus beacon flat band from w.yorks.
For those with a faulty display, it may be worth trying this first before resorting to other measures.
regards
Neil G4TCZ
|
238|238|2010-04-23 09:32:54|kf7bsf|FT-790RII overmodulation on transmit|
I finally located a 790 mk2 and performed my preliminary tests on it tonight. The rx is good, but on transmit the signal reports indicated a lot of distortion. By speaking offside the mic at an arms length away the reports were greatly improved.
I was transmitting w/the battery pack, fresh batteries, and an external dual band vertical antenna.
I tested 3 different mics, all yeasu (MH-15D8, MH-15C8, and YM-47) with similar results. One of these mics (the MH-15C8) is used daily on my FT-290RII with good reports and my normal mic position is 3~4 inches from my mouth. My suspicion is that the internal mic preamp gain is too high.
1) Does anyone have or know the location of a service manual for the 290/690/790 Mk2s?
2) Is anyone aware of the procedure for adjusting the mic gain on these radios? I assume this is an internal adjustment if it exists at all.
3) Are there any common component failures related to the problem I describe?
Otherwise this is a very clean unit and came with the 25w amp, a battery pack, and the Mh-15D8
Any feed back would be greatly appreciated.
Gene/KF7BSF
|
239|238|2010-04-23 14:26:34|g3vvt@aol.com|Re: FT-790RII overmodulation on transmit|
Hi Gene,
Think the problem you have is over deviation which seemed common problem on this series of radio. Have found some set unbelievably high.
Ideally you need a service monitor or deviation meter to check and make any necessary adjustment. Otherwise another radio is needed, preferably with narrow filters or use the old dodge of receiving through an SSB radio to get it to sound OK. The normal FT290/790 deviation standard is +/-4.5kHz deviation, though you may elect to go for less if the usage warrants this. In the UK we have a mix of 25 and 12.5kHz standards, so I use a deviation of +/-3kHz for speech and +/- 250Hz for CTCSS on all my old FM amateur radios to fit in with both camps. Note the speech and CTCSS are additive so set the speech with the CTCSS off and vise-versa. The total comes out at +/-3.25kHz when both are operating which will fit into the normal 7.5kHz IF filter bandwidth found on our 12.5kHz standard LMR/PMR radios. For normal LMR/PMR the deviation should not exceed +/-2.5kHz with 12.5kHz channel spacing equipment.
Think I have the service information somewhere for the FT290 mkII which is basically similar, but have so far not located it. However my rough notes made in about 2000 on the subject of setting the deviation on this radio are:
The deviation pot is VR05 which is located on the speaker side of the case. When viewed from above is 2" from the RHS next to a plug and socket and 2" back (from maybe the front as notes not clear). Clockwise increases deviation and anti clock decreases. Some radios are reversed in this adjustment just to be awkward! Did adjust an FT290mkII on one of our offshore Islands at the time and found no difficulty in locating the deviation pre-set control.
Hope that helps and will forward any information I find on the mk II radio. The mk1 is no problem as the instruction manual had good amount of service information and the schematic included where the mkII had nothing at all.
Regards,
Bob, G3VVT
|
240|238|2010-04-24 07:18:46|kf7bsf|Re: FT-790RII overmodulation on transmit|
Bob,
I appreciate your response. I'm trying to read up and understand what you're talking about, but I get the gist of it. I've tracked down some information online, but service information definitely appears to be rare for this model.
I would appreciate any materials you come up with, meanwhile I will try to understand this radio a bit better.
73 de Gene/KF7BSF
|
241|224|2010-05-02 20:31:12|Thomas Trout|Re: FT690R for sale|
To: electrichandbag@yahoogroups.com
From: i.m.hand@...
Date: Sat, 3 Apr 2010 20:35:19 +0000
Subject: [electrichandbag] FT690R for sale
Tidy FT690R MK1 with mic for sale. £75. Paypal preferred.
73,
Ian G1DRP
Get a free e-mail account with Hotmail.
Sign-up now. |
242|242|2010-05-06 18:56:15|Aron|FT-290R-II Battery charger circuit needed|
Hi Folks!
I've just bought a Mk-II rig & 9 pcs of 1800mAh capacyty NiCd rechargeable C batteries. The same type was used originally in its battery pack. But I do not have a suitable charger for this 10,8V/1800mAh pack. I need help with a good & simple Nicad automatic charger circuit useable for my FT-290R-II rig's battery pack.
TNX & '73! de Aron, HA8LUA
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243|243|2010-05-14 23:36:47|gordonjcp|FT-290R testing displays|
Hi there,
I picked up a display for my FT-290R off eBay, but it does even less than the display I already have. The control lines seem to be doing approximately the right thing although without a datasheet for the controller IC it's hard to tell what that is.
Is there anyone on the list who can test the displays in an otherwise known-good FT-[267]90R, so I can tell if a) I need a display at all, and b) if I've been sold a duff display?
Gordon MM0YEQ
|
244|244|2010-05-19 11:57:29|mw0cvt|Bulb replacement help needed|
Hello
I need to replace the display bulb in my FT290 MK1, I have instructions from the internet, my question is can anyone supply me with the bulb spec and image so I can get one before stripping the set down? Can anyone also tell me if there is any way an LED can be used for longer life.
Thanks in advance
Rob
MW0CVT
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245|244|2010-05-19 19:18:58|Richard|Re: Bulb replacement help needed|
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246|246|2010-05-19 23:52:05|Antonios Kekalos|FT-290RII|
I have an FT-290RII and unable to locate the microphone. I haven't had any luck with Google. Can anyone tell me where I can get a replacement? Thank you.
--
Tony, N4RNI
Traverse City, MI
SWLR-RN072
EN74es
I'm apathetic, but I don't care
|
247|246|2010-05-21 15:25:28|g3vvt@aol.com|Re: FT-290RII|
Hi Tony,
Believe that the FT-290RII uses a similar microphone to the original FT-290R. Mine came with a YM-47 dynamic microphone that has UP/DOWN buttons, a lock to disable the functions on the rear and with the seven pin Foster microphone connector. Would think that the more common Yaesu MH-1B8 as used on their HF radios of the period could be adapted. This comes with the 8 pin Foster microphone connector and would require the connections to be identified and this to be replaced with the 7 pin type. Whilst not stocked by all component suppliers the 7 pin Foster microphone connector is still available if you shop around.
The Yaesu VHF multimode 2m mobile of the time the FT-480R used the YM-40 microphone, again with an 8 pin Foster connector and have used various microphones with this including the Adonis electret desk microphone, MH-1B8, etc. Unlike more modern radios the older ones apart from some Icom models are fairly acceptable to using other types of microphone.
Regards,
Bob, G3VVT
|
248|246|2010-05-21 20:47:59|Antonios Kekalos|Re: FT-290RII|
Thank you, Bob. As luck would have it, I dug mine up from a dark corner in our basement. Actually, I'm quite surprised the radio still works as it's been in our basement, hidden away, forgotten by me, for over 14 years. Thanks again.
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249|249|2010-06-11 08:21:29|GD1MIP|CTCSS in a Mk1 FT290R|
hello, I am a new subscriber. I have a Mk1 290. I want to fit CTCSS.
I have a CTCSS board / kit. I was wondering if anyone has done it and can give tips please. I note there is a loose multi plug next to the switch board (Scan and tone switches) what does this do?
thanks Andy
|
250|249|2010-06-11 16:50:44|Richard|Re: CTCSS in a Mk1 FT290R|
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251|251|2010-06-12 16:17:39|voltspermeter|USB noise level and lack of signals?|
My mark 1 has developed a problem with the USB switched position. The usual level of audio noise has dropped considerably, and USB signals are no longer heard. As a first guess the lowered audio noise on this switch position makes me wonder if the USB crystal has gone low activity, and the local oscillator signal has failed. LSB and all other functions are OK.
Before I dismantle the rig, I thought I'd ask "the experts" if this is a known problem in these sets.
If so where might be the best place to find a replacement? Do Yaesu still support this rig?
Keith, VK6JT
|
252|252|2010-06-15 14:49:16|John|working ssb sats|
Does anyone have experience working ssb satellites with a 290R Mk2 and 790r mk2 units? I've been trying AO-7 and I can hear it but I haven't been able to hear my own signal. I'm only running on batteries so my signal output is low. I've worked many FM birds with 5 watts so I know a lot of power isn't needed. I haven't had a chance to try HO-68 yet- it's a strong satellite and may work better for me. I have the clamp on linears for both rigs so perhaps I'll have to resort to using those and a gel battery.
Thanks,
John Greusel
KC9OJV
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253|253|2010-06-19 12:50:53|John|battery power 290/790|
I'm trying to work satellites and also some band openings on 2 meters while carrying my radios outdoors. I have noticed that with the c cell battery pack I don't put out enough power to work anyone over about 30 miles SSB simplex and the sats don't hear me. I have the linear amps for my 290 mk2 and my 790 mk2 but I don't know the best approach to keep them portable and yet use at least one linear. How big a gel cell do I need and any suggestions for a means of carrying, carting two radios (one with linear) a gel battery, digital recorder, and microphone? Anyone care to share a picture of their portable setup? How far can you transmit "barefoot" with your battery pack in SSB mode? Also has anyone adapted a newer style 8 pin microphone from a more modern yaesu? My mics are getting a little beat.
Thanks,
John
KC9OJV
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254|253|2010-06-19 12:58:05|zaktherabbit|Re: battery power 290/790|
John,
I dont have experience with the SSB sats, so i cant comment there, but you dont mention the type of antennas you are using? The 1/4wl telescopic/rubber ducks on the sets are of little use except for local FM work. A simple home made 3 element yagi would work wonders for the band openings, especially if you can arrange a simple mast to get it up 10-15ft. For the sats something like an 'arrow' dual band yagi would be ideal i think, and these too can be easily homebrewed.
If your using the clamp on linear, a simple and portable power pack can be made using 2x 6v 7Ahr SLABs in series, fitted in a plastic box with handle, including of course a suitable fuse and holder, power switch and connectors. Many designs for this, and the suitable chargers, on the web, or in the ARRL handbook
Martin G7MRV
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255|251|2010-06-25 23:27:41|ajpripley|Re: USB noise level and lack of signals?|
Before you resort to dismantling, mine did something very similar a while back. I found a connector problem - the Molex style ones, and contact cleaner did the trick.
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256|249|2010-06-28 16:42:01|Paul|Re: CTCSS in a Mk1 FT290R|
Take a look at message 72 and the photo's on the Photo section....
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257|257|2010-07-04 11:39:47|zaktherabbit|100 Milestone!|
We have just passed the 100 member milestone!
But - theres still not a lot of discussion going on! Time to start posting and replying, lets get this group busy!
73
G7MRV
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258|258|2010-07-04 14:47:54|kj4noo|EME|
Does anyone use the FT-290RII for EME ? I'm toying with getting into EME on a small scale with a single yagi , 300W amp with pre-amp and using ground gain to help. How sensitive is the receiver on these ?
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259|251|2010-07-04 19:11:44|Hector Pascal|Re: USB noise level and lack of signals?|
Many thanks for that information. I did "diagnostically" wobble the relevant connectors the last time I looked at this problem, but with no joy. I'll check again and let you know if I find the same problem.
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260|258|2010-07-04 19:12:52|JOHN GREUSEL|EME|
I think they have acceptable sensitivity and a low amount of internal noise. I was comparing my FT-290mk2 to a VR-500 yesterday. I was running both through a HX-240 transverter and listening to 10 meters with the preamp turned on. There was very little difference in sensitivity and the VR-500 is a pretty "hot" little receiver. Can you hear EME with what you have already?
John
KC9OJV
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261|258|2010-07-04 21:21:59|kj4noo|Re: EME|
I still have to build the yagi. I guess that I could try monitoring with my 2m Ringo Ranger omni antenna but I doubt that I would have much luck. I already have the 290RII and the Mirage B-2530-G amp. 73 Jeff KJ4NOO
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262|258|2010-07-04 21:35:39|zaktherabbit|Re: EME|
I havent tried mine for EME, but at last years RSGB convention i attended a lecture of the use of JT65 mode (i think!) for QRP/simple moonbounce. A demo sked was arranged, using a single large 2m yagi on a bent 10ft pole! The setup was far from ideal as there were buildings blocking the best view of the moon but signals were received in the UK from the US and vice versa, although with that setup a full QSO wasnt possible.
Perhaps this approach would be worth a try?
Martin G7MRV
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263|258|2010-07-05 08:04:55|kj4noo|Re: EME|
Yes from what I've read with the software, a single yagi and the added effect of ground gain I should be able to at least work some of the big gun stations with the large antenna arrays. I want to try it before I put major $$$$ into an antenna setup ! 73 Jeff KJ4NOO
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264|264|2010-07-23 23:42:13|jon_g4fut|FT690r on JT65?|
Anyone using the FT690r for JT65 on 6 meters? If so I'd be interested to know how you have connected the Signalink, if thats what you use.
Regards
Jon G4FUT
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265|265|2010-07-26 14:28:38|John|overmodulation FT-290 mk2|
Recently I was told my signal sounded like I had RF feedback. I had someone transmit and I listened from outside with a small scanner- a VR-500. On SSB it sounds robotic like it is overmodulated and I'm not sure it's RF feedback after all. Could this be SSB deviation and is that something I can adjust ad hoc by listening. Hasanyone else had this problem and what was the solution? Has anyone replaced all or most of the electrolytics in these sets?
Thanks,
John Greusel
KC9OJV
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266|266|2010-07-26 16:14:31|John|service depot for FT-290R mk2|
Short of someone saying changing the electrolytics will cure my over mod on SSB I'd like to find a place to service it-my FT-290mk2. Has anyone on this group had luck with Yaesu service or an independent? I don't have a problem shipping to Europe- the set is small enough and light enough that it make that plausible. The signal sounds almost robotic and over mod is the best way I can describe it. SSB and FM both work but SSB has terrible transmit audio.
Thanks,
John Greusel
KC9OJV
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267|266|2010-07-27 13:29:00|sireland63|Re: service depot for FT-290R mk2|
I had some receive problems with my ft290R that I traced to a couple of dry electros in the audio amplifier. I hadn't touched this radio for 10 years and was getting back into the hobby. When I started to have trouble on transmit as well it sounded like distortion on ssb and low diviation on FM. I bit the bullet and just replaced all electros on the main board. I yanked them out with a pair of pliers, desoldered the legs that were left dangling on the board, replaced them with new ones and cleaned up any gunge that spilt out of the old mangled electro. There wasn't much gunge as most had gone dry. Problem was solved. I only replaced the ones that were resonably accessible. Took 3 hours work and was mainly the 1uF and 10uF capacitors. The minature electros I sourced from Radio Spares (RS) but should be easily available elsewhere. Give it a go!
Regards
Steve
VK2MD
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268|268|2010-07-28 18:29:35|jon_g4fut|FT690 and external linear|
Has anyone attached an external linear to the FT690r, and I am not referring to the 6020. Is there a PTT connector on the rig; I don't seem to be able to see one and the circuit diagram is far too small for my eyesight. :-)
Jon G4FUT
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269|266|2010-07-28 21:22:57|John|Re: service depot for FT-290R mk2|
Thanks for the suggestions Steve.
Sounds like that might be the problem. I decided to send it off to Geoff at Castle Electronics in the UK as several on this group have had success there. He seems friendly and thoughtful and I expect this to be a good experience. I'll report back here when I get the set back. At the least he can do diagnostics I couldn't do.
John
KC9OJV
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270|270|2010-08-11 15:05:57|Mansueto|Low Mic Gain on ssb|
Hi all,
I have an FT290R which I use as an IF for my Microwave equipment and I keep getting told that although the modulation quality on SSB is good yet it is very low.
I tried to rectify the situation by following the alignment procedure as o page 43 section 6, but even with Mic level(VR2001), level is still very low and would have to literally speak lips to the Mic to have a descent level.
Any Ideas??
Thank you in advance
Mans. 9H1GB
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271|271|2010-09-03 13:32:51|John|Ft-290R Mk11|
Well I got my mk11 back from service and it works much better. It was a bad ground on the PLL assembly. Now I'm sounding fairly good (according to a local 2 meter friend). However (on FM) he says it sounds like I'm about 5K off frequency on transmit. He said that when we were on the local repeater and also operating simplex (fm the whole time). I have two thoughts on this- either the radio got banged hard coming back and lost it's alignment or the electrolytics are still failing and now that the bad ground is repaired that's my only problem. On the Ft-290R there is a reference (on the net- mods)about tweeking the FM tx alignment slightly with a coil. Does anyone know where that would be on a Mk11? Also does anyone have a list of capacitor values and lead configurations for the Mk11?
Thanks again for your help,
John
KC9OJV
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272|271|2010-09-04 22:24:56|g3vvt@aol.com|Re: Ft-290R Mk11|
Hi John,
The listing for the FT290RII microphone I have indicates the two versions are not compatible. The FT290R uses a 7 pin microphone, where the FT290RII shows an 8 pin version:
1. UP
2. B+
3. DWN
4. SPKR
5. N/C
6. PTT
7. GND
8. MIC
Regarding TX frequency error on FM, it will pay to get hold of a service monitor and check that all modes are where they should be before starting any re-alignment of the FM TX frequency. In the limited exposure I have had with the series the problem seems to be due to xtals ageing and the like affecting all modes. If all is fairly normal when checked with an accurate frequency meter and preferably measured via a high impedance probe to prevent circuit loading where possible, then consider aligning the FM MOD oscillator. With the FT290R the last one I handled off frequency believe the answer finally was adjustment of the PLL local frequency via L3007. This is shown in the handbook to set the reading at 145.000MHz set to FM (or believe 146.000MHz for the USA model). The measurement is at the cathode of D3002/3 and should be 135.190.0MHz according to the notes. An equivalent point on the FT290RII is PJ01 on the PLL unit 40xx which is the output to P3001 on the main unit 30xx. According to the listing on the FT290RII block diagram for fVCO this is apparently 131.115MHz which will be down to a different first IF frequency for the two versions.
If this is correct the FM TX MOD frequency of 13.9885MHz should be adjustable via T3013 which is in the base circuit of Q3026 and adjusts xtal X3001. Not worked on this with the FT290RII and the information is gathered from the limited service information I have for the model. The must be a service manual available somewhere, but have yet to find a copy.
Hope that helps, but again do ensure that the PLL local oscillator output is correct first.
Regards,
Bob, G3VVT
|
273|273|2010-09-04 23:45:34|zaktherabbit|Strange fault on an FT-290mk1|
Hi, I wonder if anyone has come across this before, and if so whether they cured it!
Ive suspected for some time my FT-290mk1 was off frequency on SSB, believing it to be by about 2kHz. Well, tonights contest gave me an opertunity to work several stations and ask for a frequency check
One station reported their dial as reading about 5kHz higher than mine, this was around 144.257. Another reported their dial as being 1.4kHz higher than mine, around .311. But then it got wierd!...
I was on (my dial indication) 144.309.7, and worked him 59. I then tuned down, and heard the same station at 144.305.3! just as strong. OK, so we think ive some non-linearity in the receive side, but! I called him on this frequency, and worked him again, at 59!
Now, i have NEVER seen that before! hearing the same station in two places yes, but being able to work him in both? whats going on there?
I would love to know if anyone has seen this before!
Martin G7MRV
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274|273|2010-09-05 00:09:58|ZL1SWW|Re: Strange fault on an FT-290mk1|
Hi,
I think I would be looking at the PLL with a specan and seeing if you have got some nasty phase spurs happening. It could be that the PLL LPF caps have gone dry. You maybe seeing phase comparator noise / pulses coming through.
Phase noise issues will become really apparent with strong signals on RX and will show as beig seen in several places. With -50 to 60dBc/HZ noise, strong sigs will show up in other places.
Cheers,
Simon.
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275|273|2010-09-05 01:07:30|Geoff Blake|Re: Strange fault on an FT-290mk1|
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276|273|2010-09-05 10:40:02|Bill Aycock|Re: Strange fault on an FT-290mk1|
Maybe he moved?
Bill--W4BSG
--------------------------------------------------
From: "zaktherabbit" <
barfield673@... Sent: Saturday, September 04, 2010 4:45 PM
To: <
electrichandbag@yahoogroups.com Subject: [electrichandbag] Strange fault on an FT-290mk1
|
277|273|2010-09-05 10:42:22|zaktherabbit|Re: Strange fault on an FT-290mk1|
Bill,
not unless every other station is also moving 4-5kHz to annoy me!
i rapidly switched between frequencies whilst he was CQing and he was just as loud on each during the same call!
Had the same with most stations, inc. a PA6 this morning!
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278|273|2010-09-05 13:58:58|g3vvt@aol.com|Re: Strange fault on an FT-290mk1|
Hi Martin,
Perhaps is more common than realized with a number of versions of what is 144.300MHz at one time!
You need accurate test equipment to resolve the problem. Follow the FT290R handbook information on checking the PLL LO output frequency as this being out will affect both TX and RX frequencies. If this is off frequency as a starter check the xtal frequencies in the PLL section are correct according to their marked frequencies using a high impedance probe so as not to load the oscillator. If these is OK a limited adjustment of L3007 in the FM mode can bring the radio back on frequency as the error affects all modes. Quite often the error will be in the order of 2kHz, though this is not to say that there will still be a disparity with other radios. A test with later models such as the FT857, etc, that use better stability synthesizer systems as mentioned in another posting can be more informative. Had a similar problem with my FT480R which turned out to be ageing of the xtals in the end, though with that the error was not as great.
Regards,
Bob, G3VVT
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279|273|2010-09-07 23:15:00|zaktherabbit|Re: Strange fault on an FT-290mk1|
well, it is indeed a problem in the PLL!
every time the set makes a transition over 10kHz (ie from 144.299 to 144.300) there is a jump in frequency back by nearly 6KHz!
It does this on Tx as well, hence my being able to work a station on both frequencies i was receiving them on. The 6kHz change then spreads across the 10kHz, so its on the correct frequency (ie dial and actual F match) at the 100kHz, only to jump again on going another k!
So, i just need now to discover whats faulty in the PLL and hopefully fix it! It looks like a data error. Unfortunately, it looks like this set uses serial data lines!
Martin
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280|273|2010-09-08 21:03:22|Geoff Blake|Re: Strange fault on an FT-290mk1|
Hi Martin,
Some VHF radios use a 10kHz step synthesizer, and smaller frequency increments are generated by tuning the "upconverter xtal" with a varicap diode which pulls it in 100Hz or 1kHz steps. I believe this is well documented in the manual, but I cannot access the .pdf's at the moment.
73 Geoff
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281|281|2010-09-10 06:46:58|zaktherabbit|Wanted - dead FT290mk1!|
Hi chaps,
i know this is a real longshot, but if anyone has a dead (oreven semialive!) mk1 FT-290 they would care to donate, i am looking for one to allow me to completely strip it.
The purpose of this would be to create a series of high resolution photos of every section of the radio, create a guide to the connections of the wiring loom, and to produce a large scale parts placement diagram of the board (something which seems impossible to find), noting in particular the various parts that are either under-board mounted or in-line with the wiring loom!
Naturally, carrying this out is likely to kill a working radio (especially creating the placement diagram which will involve depopulating the board!)
So if anyone has a dead set they would like to donate to medical science, please let me know!
Martin G7MRV
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282|273|2010-09-23 21:24:43|zaktherabbit|Re: Strange fault on an FT-290mk1|
well, problem solved!
turned out it was just badly out of alignment. Ran through the full PLL alignment procedure and alls well
Martin G7MRV
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283|283|2010-09-28 15:33:05|cd40105|ft 290 Mk1 which part or pats are now obsolete|
Hi, hope this isn't a case of too many cooks, I've been told in the MK1. ft 290 theres an obsolete part..I don't know what it is or what is does. Can anybody provide me with any answers please.
thank you ian g3yrq.
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284|283|2010-09-28 15:34:36|zaktherabbit|Re: ft 290 Mk1 which part or pats are now obsolete|
Hi Ian,
Its quite possible many parts are now obsolete in the mk1. Although many will have equivalents, without checking i would say the microprocessor and the LCD driver almost certainly, as these are custom devices.
Martin G7MRV
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285|285|2010-11-02 11:51:08|va2dv|Looking for an FT-290MKII|
I am currently looking for a clean FT-290MK2.
Accessories a plus but not a deal breaker.
Let me know what you have !
Thanks for looking !
Please contact me directly at :
Dave.allard@...|
286|286|2010-11-04 22:52:13|rpcrichton|What is the screw thread form on the mk1 290?|
Hi group , I would like to homebrew a 1/4 wave out of ultra malleable copper I note that in the times of production there was a 1/4 wave produced to replace the telescopic and also a rubber duck can anyone tell me what the description of the thread is ? I would like an original but they seem to be few and far between.
I have one of each of both series of x-90 rigs , it would have been nice to have a 4m variant also.
best 73 Paul M1BPT
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287|287|2010-11-14 02:16:55|kf7bsf|Looking for a FT-290, 690, 790 or mk2 case|
I'm looking to buy a case from any of the FT-X90 series. Prefer a mk2 case, but I should be able to work with a mk1.
I'm building a project to go with my 3 mk2s, so the matching case would be a great start.
I also have a 790mk2 that needs adjustments and or caps replaced, so I would consider buying another 790mk2, then just part out the current radio.
73 de Gene/KF7BSF
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288|288|2010-11-14 02:39:30|kf7bsf|Looking an FT-790 mk2 Technical Manual|
Greetings All,
I'm still trying to locate a tech supplement for the 790 mk2. I have the supplement for a 290 mk2 but the difference are substantial. I am willing to buy a manual, pay for scans (high quality) or whatever. My searches have turned up lots of mk1 stuff, but that's it.
73 de Gene/KF7BSF
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289|289|2010-11-15 18:53:09|J|Conversion of a 290 to a 690|
Hi
Anyone out there know if its possible/feasable to convert a 290 to a 690, as having looked at the block diagrams and schematics for both rigs it looks possible, I'm asking as I recently bid for a 690 on E-bay but it went for far more than I thought worth it (almost £200), so has anyone done this or have any thoughts about it let me know
Jim G1ASN
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290|290|2010-11-16 14:59:27|geoffrey pike|290 to 690|
Hi You could do what i did and fit a Meon transverter into the 290 battery box, probably alot easier than messing about with the synthesizer, Geoff
|
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291|289|2010-11-17 18:21:20|g3vvt|Re: Conversion of a 290 to a 690|
Hi Jim,
As Geoff notes adding a transverter could be the easiest option
(unless you have unlimited time and resources to hand!).
Hence the price differential for the rarer FT-690 compared to the
FT-290.
At a guess you would have to replace all the tuned circuits on the
RX front end, redesign the complete TX strip from the mixer onwards
and re-arrange the synthesiser to provide the injection oscillator
frequencies required. If to be used for 6m FM would also require to
have 12.5kHz channel steps available also.
Not sure the Meon as it was originally available would cope with 2m
input as believe was nominally designed for HF input of 28-30MHz
similar to the Cirkit offering of that era. Additionally only gave an
output of 0.5W and needed a PA to boost the output. That is even if
you could even source the PCB as this has been out of production for
a while unless somebody such as Spectrum have re-introduced it to the
market as a PW PCB?
Spectrum have a 2m to 6m transvertor as a kit or ready built, but is
rather larger needing to be used as an external unit. They are now
available as a single IF version that will take a higher level of
drive such as the output of the FT-290.
Regards,
Bob, G3VVT
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292|292|2010-11-19 09:10:33|hennessyben@ymail.com|290R fault|
Has any one i fault in their 290 when the meter goes FSD on RX and has no output power on TX.
Thanks
Ben
VK5TX
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293|292|2010-11-20 18:05:34|Neil Horne|Re: 290R fault|
Hi Ben,
I had a similar problem with my FT290. I followed the CPU reset sequence in the manual, which up to press has resolved the situation. Been OK now for over 6 months.
regards
Neil G4TCZ
|
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294|292|2010-11-20 23:16:27|Mansueto Grech|Re: 290R fault|
Hi Ben,
Yes almost all ft290r at some point suffer from this problem. In my case the problem was the AGC/ALC circuitry. I had to change a couple of these bad electrolytic capacitors.
BY THE WAY if you leave the set on for say half and hour the full faction is restored.
Ben hope I was of some assistance and id you require further assistance please do not hesitate to ask
Good Luck
Mans. 9H1GB
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295|295|2010-11-27 03:08:53|ndrngl2004|subtone|
hi,
I need to use a subtone .
It's ok if I inject it in the mike socket? may be it will be attenuated by the filter?
I know its better inside but I have also an ft 790 and build one subtone board it's better than two...
ciao de IZ0TUT Angelo
ps :Sorry for my english!
|
296|295|2010-11-27 11:28:32|Gordon JC Pearce|Re: subtone|
On Fri, 2010-11-26 at 14:31 +0000, ndrngl2004 wrote:
The filter for the mike has a highpass filter with a cutoff of about
300Hz. So, the CTCSS tone will be filtered out by that.
Gordon MM0YEQ
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297|295|2010-11-27 16:17:31|g3vvt@aol.com|Re: subtone|
Hi Angelo,
Within reservations it is possible to inject the CTCSS tone via a suitable coupling capacitor and series resistor at the microphone socket on pin 2 on the mk 1.
I have done it with an FT-790R mk1 as a necessity for a local amateur when we shifted our local UHF repeater GB3LF to CTCSS only operation. The CTCSS encoder was built in a small external metal box with a 7 pin microphone connector on the front and a short lead to go into the transceiver microphone connector. External 12V can fed into the unit for powering the CTCSS encoder or a feed taken from pin 4 which has 5V available as long as the current drain of the encoder is low. From memory a miniature toggle switch was placed on the front of the metal box to enable the unit to be switched off for normal simplex use. As the CTCSS level needed was greater than about 100Hz deviation even with the 300Hz high pass filter noted by Gordon it will still work. I use a CTCSS level of 250Hz deviation on all my radios and this level is fairly easy to achieve. Did note however the was a downside with this method in that the CTCSS level was influenced by speech deviation level. An FT-290 mk2 similarly modified was less susceptible to this problem.
It does work is the bottom line.
A better method would be to provide a new connection from the microphone socket to a point after the deviation control such as the wiper connection though I do note looking at the circuit diagram that there is a point marked T SQ just before the low pass filter that feeds the deviation control. With the mk 1 all the 7 pins on the microphone connector are used. The Sp connection on pin 5 could be discarded if not used and the direct connection made there or even an 8 pin microphone connecter installed to provide the spare pin. The choice is yours. I decided to keep it simple and leave the radio unmodified in both applications of the encoder.
Regards,
Bob, G3VVT
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298|295|2010-11-27 16:21:29|gi0gdp|Re: subtone|
--- In
electrichandbag@yahoogroups.com, "ndrngl2004"
I run CTCSS on my 290R MK1, you can inject the tone into Q2004, uPC577H
This is the mic amp, i inject at the TSQ test point, it has a green wire connecting to the test point post.
You will see this on the circuit diagrsm. To locate it remove the top cover and it is to the right of the ssb xtal filter and half way from the front.
Geoff|
299|292|2010-11-28 00:55:35|ZL1SWW|Re: 290R fault|
Hi Mans,
Interested that you managed to fix yours.. I have been plagued by the ALC problem and changed out two caps in the ALC circuit with not much success. I think it has improve dteh issue from taking 30mins or so to come right, it is now down to about 5 or so mins.
Do you recollect which ones you changed? I thnk I did C92 C87 and maybe C86 as well but memory fading a bit o that one.
Cheers & thanks,
Simon
ZL1SWW
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300|292|2010-11-28 13:20:10|Mansueto Grech|Re: 290R fault|
Hi Simon,
Yes, I do recollect changing All 3 Capacitors.
Mine does the same that IE everything returns to normal after around 5 minutes from switch on. Have noticed that if I switch on the rig say a hour a day the time is very much reduced. Also during the summer months the rig comes on to normal almost on switch on.
One point to notice is that probable those electrolytic capacitors in question, probably leaked dielectric in to the crappy type of PCB Yaesu used (pressed cardboard like) and that could also cause the problem. I have also a similar problem with a Kenwood TR9130 but as I was saying 5 Minutes is not such a long time to wait.
Good luck and I'll keep you posted, and please do the same
73's
& good luck
Mans. 9H1GB
|
301|292|2010-11-28 18:39:42|g3vvt@aol.com|Re: 290R fault|
Hi Mans,
First have you tried the modification discussed by Harry. G3LLL in his column of Practical Wireless of August 2007? This subject has been discussed here before a year or two back, so the thread should still be there. His modification was to add a 47k resistor between Q1014 base to emitter. Was also thought at the time that diodes D28, 29 and 30 may be involved in the matter. Additionally the rubber glue employed by Yaesu in vibration sensitive areas can go conductive with age and so can be suspect. Often quite difficult to remove.
There has been intermittent discussion regarding problems due to effects caused by deteriorating electrolytic capacitors in the FT290R mk1 and other band variants also being the cause, but until now nobody has had the knowledge or courage to name them, Simon, ZL1SWW is the first I have seen. C86 and C92 are very much possibilities in the cure. However, C87 being a 33pF ceramic or similar coupling capacitor is not as likely, though still could be in there with a chance. Who knows!
Whilst I was trawling my poor copy of the FT-290R mk1 service manual to look at the chopped up circuit diagram (which was rather time consuming), noted down all the electrolytic capacitors that could be any way possible in causing problem whether by leakage causing a conductive path internally between the layers or on the surface of the paper based PCB or a lack off decoupling by the capacitor drying up. The list is longer than you suspect and some could be dismissed as unlikely, but to be complete this is the list I found and even there some may have been missed!
C03, 04, 05, 06,10,11, 17, 19, 20, 27, 33, 45, 54, 55, 62, 65, 67, 86, 92, 94, 104, 109, 112, 123, 126, 128, 129, 131 and 137. C136 (1000uF) is less likely unless any leakage has gone somewhere it should have not. Thirty capacitor in all is the tally so far.
Quite a long list and may as mentioned have missed a few of the capacitors that are polarity marked on the diagram and have values to be expected. A lot are 10uF which may help if you are buying in bulk to do an "umbrella job". However, still would cost a substantial amount to do in full. For the lower values I would prefer to use tantalum capacitors were it not for the cost. Have only come across one faulty tantalum that went S/C in a logic system, but was harder to trace as was one of nine on a common supply rail.
Certainly you would need to use a vacuum desoldering station with a fine nozzle on the tool to do the work as one may cause faults that were not there to start with! The price of these has come down in the UK in recent years with CPC offering a cheaper desoldering station, Duratool ZD-915 at £65 + VAT. I have the Hakko 808 handheld device bought in the USA in earlier years for substantially more.
Would appreciate somebody who has done the cure on the FT-290R mk1 breaking down my list to remove none starters.
Is an ongoing problem and seems to be getting more frequent reading the mail. Also is difficult to pin down as the radio starts working normally after a period of usage and may not immediately go faulty again afterwards.
Regards,
Bob, G3VVT
|
302|292|2010-11-28 20:44:53|Mansueto Grech|Re: 290R fault|
Hi Bod,
Thanks for the reply. All noted and yes I did try the mod as suggested by Harry. I remember clearly the article but for me that did not work. One of these day I borrow my friend Capacitor Wizard ( as many of you might know this fantastic rather expensive ESR tester) and check all electrolytic. Although I am of the opinion that in my case the fault ties in the type of PCB used (rather Crappy I should add). this opinion is based on the fact that when I lightly freeze or heat the PCB from the solder side the fault manifests itself.
I frequently use the Rig as an IF for my 10Ghz portable equipment though I did now get an FT817NR as a possible backup.
Anyway Once again thanks for your thought and hint I am sure many of use found them interesting and food for thought. I sure Have.
73's
Mans. 9H1GB
PS Anyone happen to have a, maybe colour copy of the PCB LAYOUT as I believe a service manual for this rig was never available.
thanks in advance
|
303|292|2010-11-29 12:31:37|g3vvt@aol.com|Re: 290R fault|
Hi All,
Found another 10 electrolytic capacitors that may warrant investigation though most possibly unconnected with the FT-290R fault. These are: C21, 22, 23, 26, 42, 48, 96, 110, 111 and 134.
Which brings the total tally up to 40 electrolytic capacitors. For completeness will give the list again.
C03, 04, 05, 06,10,11, 17, 19, 20, 21, 22, 23, 26, 27, 33, 42, 45, 48, 54, 55, 62, 65, 67, 86, 92, 94, 96, 104, 109, 110, 111, 112, 123, 126, 128, 129, 131, 134 and 137. C136 (1000uF) is less likely unless any leakage has gone somewhere it should have not.
A careful study of those that can be excluded would help and must be the majority of the list.
Regards,
Bob, G3VVT
|
304|292|2010-11-29 15:29:15|g3vvt@aol.com|Re: 290R fault|
In a message dated Sun Nov 28, 2010 10:44 am ((PST)) "Mansueto Grech" mansueto.grech@... mans_9h1gb writes:
Hi Mans,
This was the type of PCB used in that era made from paper laminate, the fibreglass type was still fairly rare from apart from mainly high end test equipment up to then. When I started work in radio and TV servicing in the late 1950s all the devices we saw were using point to point wiring with the first PCB appearing a number of years later in the 1960s. These were paper laminate types and suffered from scorching due to local heat from components plus tracking between the layers of the PCB where high voltages were present. Could lead you on a "wild goose chase" until it was found out what the problem was. For the low voltages seen in transistorised amateur radios the paper laminated PCB were acceptable and probably a lot cheaper to produce.
Would be interested if you can localise exactly where freezing and heat have an effect on the problem as this may assist in finding a cure.
Other potential problems are where through rivets, etc have been used to provide ground connections from one side of the board to the other. Sometimes the ground connections go through a link via metal support structures and fractures of the print in these locations is not unknown. The the through rivet problem was common with the IC-240 2m transceiver and needed approximately 22 rivets removing to be replaced with short lengths of tinned copper wire to affect a permanent cure. Suspect it may have affected early Icom HF transceivers that used similar techniques on the PCB.
During studying of the FT-290R mk1 circuit diagram have noted the location of the 3V back up battery which was a question made a while back. For future reference it is on the Regulator PCB No.4xxx. This is a vertical PCB second from the front panel. How you extract it may be another problem!
Have not seen a service manual for the FT290R mk1, but the one for the FT290 mk2 is definitely available.
Regards,
Bob, G3VVT
|
305|295|2010-11-29 19:14:48|ndrngl2004|Re: subtone on a faulty ft 790!!!|
tank's for your answer also to Gordon and Bob.
I will try with an internal circuit made with a 555 with a sub tone for the repeaters of rome and a switch for the sky ( I want to try satellite!) This is a simpler e cheaper solution better than a dedicated chip. But I 'll try also the external ( i like to experiment :-) )
Ill try and tell you the story but after I resolve a little problem:
yesterday, while the 790 was receiving the smeter go full scale, the display dimmed off and the silence come in the speaker and in my heart!
I go to my chip-pusher and come with a bag of capacitor.
The surgery will become tomorrow at 19:00 zulu.
Think to me!
ciao de iz0tut Angelo
|
306|292|2010-11-30 01:31:45|vk2md|Re: 290R fault|
In my revamp of my ft290R mk1 (owned from new) I bit the bullet and just replaced all the electrolytic capacitors on the main board that were easily accessible. The radio hadn't been used for 10 years BTW. I used a brutal approach in just yanking them out with pliers and then desoldering the pins that were left behind. I was worried about damaging the pc board by using a solder wick. Half the caps oozed goo and half didn't after this brutal extraction method, so i guess some were dry after 25 years.
This resolved a whole pile of problems from no Audio and low deviation on tx.
If you have a few hours to spare and have multiple issues then you may want to try this approach.
I replaced the backup battery as well. I couldn't get a directly replacable unit, but managed to find a similar battery that had solder tags welded on it and managed to "get it to fit"!
Steve
vk2md.
|
307|307|2010-12-05 19:36:02|mickhannam|Mutek front end and antenna configuration|
Has anyone noticed that with the Mutek front end fitted the Rx performance on an external antenna is affected by the position of telescopic antenna.
With the antenna retracted Rx is weak, extend it and then shorten so it is out of its holder but not fully extended and it is OK.
Not sure if this is a problem with the telescopic touching the screened holder when it is retracted or if it is a capacitive effect when it is retracted in its holder.
Performance with the telescopic seems fine.
Any thoughts, or anyone seen the same thing?
Mick
|
308|307|2010-12-05 19:47:42|mickhannam|Re: Mutek front end and antenna configuration|
Sorry, forgot that the telescopic shorts whenit is retracted.
Mick
|
309|309|2010-12-09 16:31:57|zaktherabbit|Thought experiment - replacing PCB?|
Hi Chaps,
Just a thought experiment at the moment!
There has been much, much discussion about the AGC fault problem, and many possible fixes have been tried, none of which seem to completely cure the fault. The latests thinking seems to be that the poor grade SRBP PCBs used those days absorb any leaking electrolytes and this is what causes the problem.
Now, what im proposing as this 'thought experiment' is the complete replacement of the PCB set, using modern FR4 or better material. The reasoning behind this is thus -
paxolin boards are, im sure we all agree, crap. They are not good quality, they absorb any crud spilt into them, they are not very rigid. Modern board is much more risilient, very rigid, and will last a long time, certainly longer than poxy paxolin!
Also, these days there companies that will produce high quality, double sided, drilled, plated and silkscreened PCBs, in small quantities and at very reasonable cost. Getting replacement PCBs made is, from a cost point of view, highly practical.
So, what are the downsides to this idea? well, firstly, we would need a PCB layout, for both sides, of each board. The only practical way of obtaining this would be to use photographic techniques to copy an actual board. This of course means getting a FT-290mk1, stripping it completely, so that the boards can be copied. Im sure that the PCB company would do the copying task, but the dismantling would be our remit.
Second, once a set of boards were made, they would need to be repopulated with the parts removed from the radio. With any luck, careful work would mean everything would go back together. A plus point here, is that electrolytics could be batch replaced at the same time, likewise, certain obsolete and perhaps low performance parts could be replaced using high grade modern equivalents.
So, what are peoples opinions of this idea? If it were found to be practical, how many would want to obtain a set of boards and do this work?
The big, big problem in even getting started with this, is the need to initially dismantle a radio (preferably a working one!), which requires either someone with a spare biting the bullet, or someone with some spare cash taking the risky plunge
I'd like to hear peoples thoughts
cheers
Martin
|
310|309|2010-12-11 01:22:52|Gordon JC Pearce|Re: Thought experiment - replacing PCB?|
On Thu, 2010-12-09 at 14:31 +0000, zaktherabbit wrote:
My late father used to rebuild audio amplifiers with damaged boards
(amps of the kind of size that would take lumps out of the fibreglass
when all the semiconductors participated in a murder-suicide pact) by
desoldering all the components and photocopying the boards onto acetate
which could then be used to mask UV-sensitive etch resist.
Gordon MM0YEQ
|
311|311|2010-12-22 00:23:48|peter Laughton|FT290R circuit boards|
My 290r had a hickup today. Seems as if the mic cord had an internal break just above the plug. All fixed. Checking my records revealed that I bought it in 1979, that means its over 30 years old. Cost over $400 A back then. I bought the mobile mounting bracket and the sholder holster, along with some nicads and a charger. The nicads and charger are long gone, but the case and mount still work. A few faults over the years, pin diodes in xmiter when 18 months old was the worst. Its been subjected to several decades of vibration in my truck with only the pcb earth links needing resoldering occasionally. Interestingly, the PCB' s in mine are made of fibreglass, the electro caps are all 105 deg C types and are branded ELNA-japan. The small squelch board is bakelite though. The pcb tracks look hand drawn and are a bit rough looking. I dont think it was computer designed. The foam stuff attached near the speaker has disintergrated and I scaped it all off. The filter is a bit corroded from the foamy stuff, but everything else looks OK. Of course, the memory batteries are dead, but as its switched on all the time thats not a problem. The mode switch acts up a bit due to being in the same position all the time. A few operations clears it up and it just keeps working. I have fitted a cctss board (home made using 555 ic) inside and apart from the need for a fair bit of injection to activate the repeater, it works well. My serial number is 002520. Its is switched on 24 hrs/day in the truck and connected through a 5/8 antenna and 50 watt amp. Works well, if a bit deaf due to the front end fet being weak. I dont think there was ever a mk1, it was always the FT290R, even in the adverts. Regards all Peter Laughton |
|
312|312|2010-12-22 23:00:42|J|mutek board for possibly someone to make an etching diagram|
hi; just thoght I'd let you know I've added some photos of the mutek board in my 290r mk1 could someone possibly work out/make a diagram so anyone could then etch their own board and then make a complete new unit as its impossible to buy them.
regards jim G1ASN
|
313|313|2010-12-23 23:42:47|hennessyben@ymail.com|WANTED FT-790|
I am after a FT-790 to drive my 5.76Ghz transverter.
Thanks
Ben
VK5TX
|
314|83|2011-01-03 20:02:12|zaktherabbit|Test|
Just a test of the messaging, please ignor
M
|
315|315|2011-01-13 22:58:01|Jim|mutek for 790r mk1|
Hi
Does any one know if there was a mutek board for the 790r mk1
if not does anyone know if the mutek board for the 290mk 1 will fit
i the 790r mk1
regards jim G1ASN
|
316|315|2011-01-15 00:26:25|zaktherabbit|Re: mutek for 790r mk1|
Ive never had a 790 so dont know if Mutek did a front-end board for it. What i can say though is that the Mutek board for the 290 is not compatable. The mutek is a tuned amplifier unit, obviously in the case of the board for the 290, tuned to 2m. It would not work in the 70cm FT-790
Martin G7MRV
|
317|317|2011-01-20 19:56:24|Jim|mutek board for etching diagram|
Hi jim here,
recently purchased another 290r mk1 with mutek board but this one was of the last types they made but it was hot glued to an original mutek board for the SLNA 145sb so if any one wants to make their own boards check the pics in the album ''mutek board'' in the photos section good luck and regards jim G1ASN
|
318|318|2011-01-24 00:06:20|Aron|FT-290RII+NC72C charger|
Hi All!
I have a mkII rig & 9 pcs of 1800mAh D-cells in the battery pack.
There is a real cheap and little wall charger NC72 for the new generation of Yaesu handheld radios. They have battery packs of 9,6 V when fully charged. My pack (because of including 9 cells) is 10,8 V.
This charger gives 12V & 500mA charging current.
Culd I use this NC72 charger for my mkII rig or not?
'73! de Aron
|
319|319|2011-01-25 10:56:53|raimo|PL Tone|
Hi All.
I would like to work satellites (ft290r1 / ft790r1)
and it is needed PL tones.
Is there any simple way to do it ?
Ready made chip or ?
73s de rami, oh6bi
|
320|319|2011-01-26 00:03:31|glennpringle|Re: PL Tone|
Hi Rami,
Try this company for the PL (CTCSS) tone encoder. There is an article in the database on where the inject the tone for best results.
http://www.cstech.co.uk/radio.html Hope this helps
73s
Glenn
G0TGZ
|
321|319|2011-01-26 00:06:49|zaktherabbit|Re: PL Tone|
Rami,
As Glenn has shown, there are several companies that supply suitable encoders. It is also relatively simple to build one. The link below is to a simple circuit using a PIC microcontroller
http://www.spikey-mike.com/radio/ctcss.html I have tested this and it works fine. In fact, Im in the process of organising a small run of PCBs for this circuit. They were meant to be available some time ago but ive not got around to it yet.
Martin
|
322|319|2011-01-26 12:45:13|raimo|Re: PL Tone|
Thanks Martin and Glenn.
link:
http://www.spikey-mike.com/radio/ctcss.html didnt open
but
http://www.cstech.co.uk/radio.html opened
I will start planning.
I have old Icom mike which has plenty of buttons.
First to check how it is built. It came to mind that
encoder could be inside the mike ....
Maybe there is Yaesu mike with encoder.
...
by the way, I wrote here last summer about my 290, it was not
working and forgot to comment here.
Radio started working itself after staying in dry town QTH
one or two weeks. 290 was long time at summer cottage (island)
and where is more moisture in the air.
...
73s de rami, oh6bi
|
323|323|2011-01-26 12:46:14|gerbiltronics|AGC fault with FT-790R Mk1|
Hi all
I have a Mk1 FT-790R which I purchased some time ago as defective (it had the much-mentioned AGC fault). I have recently cured this by doing the usual 47k resistor mod across the b-e junction of Q1018 (the FT-790R circuit appears somewhat different to the FT-290R in this respect, but the principle is the same).
However, the s-meter appears to have a very slow decay on FM (i.e. if you are receiving an S9+ signal and this suddenly disappears, the meter drops to zero only gradually). In fact the s-meter decay rate is the same on FM as it is for USB/LSB modes - the only mode that DOES have a fast s-meter decay rate is CW.
Not sure yet whether this is just an s-meter issue or whether AGC is also subject to the same slow recovery, although monitoring of un-squelched receiver noise suggests that the AGC is OK.
Has anyone else experienced this with the FT-790R? Is it just an annoying "feature" of this model (unlikely, surely?) or do I have another fault with this example? I'm trying to work my way through the forest of switching diodes and other circuitry in the AGC control stages, but so far with no definite conclusions.
Regards
Kevin, ZL3KE
Shaky City, NZ
|
324|319|2011-01-26 12:46:32|raimo|Re: PL Tone|
I found FT790 / YM-50 optional DTMF microphone schema and uploaded
it to files section as Yaesu YM-50.pdf file.
How is this type of mike for sending PL tones, or are the PL tones
different than DTMF tones ?
73s de rami, oh6bi
|
325|319|2011-01-26 12:57:06|zaktherabbit|Re: PL Tone|
Rami,
yes, DTMF and PL (or CTCSS) tones are different. DTMF (Dual Tone Multi-Frequency, also known as Touchtone) are dialling tones, used for sending numbers, ie for accessing an IRLP node, or a PSTN dialler on a repeater (they are the tones a telephone sends)
CTCSS (Continuous Tone Coded Squelch System, also known as Private Line [PL, motorola] and QT[Quiet Tone, philips i think) uses a continuous low frequency tone (called sub-audible, as its filtered out by the receivers audio stages) to enable the audio output of the receiving station. This was originally intended for shared PMR repeaters, where each subscriber would be allocated a tone. With the tone activated they didnt have to listen to other users traffic, but the receiver would still indicate that the channel was in use (ie rx LED etc)
IN amateur use, DTMF is used as stated above, and occasionally for paging. CTCSS is used to prevent signals not intended for relay through a repeater from being relayed. Only a strong enough signal, correctly modulated and with the correct tone, will activate the repeater. In satellite use this prevents normal terestrial signals from being relayed and hence wasting the sats power.
Use of CTCSS on repeaters has mostly superceded the use of the 1750Hz toneburst now.
The main thing to consider with a CTCSS unit for the FT-290 (mk1) is where to fit it! If your radio does not have a Mutek board, there is a space there, if it has, you must either make a very compact board (maybe SMT?) or else mount it outside the radio. Sorry the link to Mikes circuit didnt work, it worked for me a moment ago. His circuit wires in using the memory switch to select the tone, and automatically enables to tone unit when repeater shift is selected.
Martin
|
326|326|2011-02-01 12:33:35|Jim|cstech.co.uk tone encoder fitting to 290r mk1|
Hi Jim here,
Having recently purchased and built a couple of tone
encoders from C S TECHNOLOGY Ltd at www.cstech.co.uk (I purchased the 47 tone version) I have now fitted one into a Spare 290r mk1 and having tested it it seems to work. Please see the photos in ''CSTECH''
folder in photos, one is the schematics and the other is where to connect inside the radio it'self.
Hope this helps anyone who is going to fit a tone encoder into their radios regards Jim G1ASN.
|
327|326|2011-02-01 18:00:54|raimo ilkka|Re: cstech.co.uk tone encoder fitting to 290r mk1|
Thanks Jim.
I have to order one unit and try.
73s de rami, oh6bi
|
328|328|2011-02-21 00:32:42|ve7bgp|New FT-290R Owner|
Last Thursday I had a good fortune to pick up a nice old FT-290R Portable from some SK items that came into our Club Meeting. Yesterday I loaded it with 8 Pre-Charged RayO'Vac Platinum 3000 MAH Batteries and got good signal reports on a couple of our non PL Repeater. They still exist in Canada. I already picked up some info on some of the Mods the former owner performed. Mine has a BNC Connector on the Front in place of the Telescopic Antenna. I suspect it might have a Mutex Board. My old AEA Hot Rod Antenna looks great on this rig. I also have had a Really Nice FT-208R Handie the last Couple of years I am proud of for Classic Exchange Contests, It helped me win top score for FM mode a couple of times. These Buddies also join my FT-GX Brothers my Venerable old FT-757GX Having a lot of fun with it in the CW ARRL DX Contest this Weekend and It's Bigger FT-767GX Brother What a Great all round Rig!!! I am member of the FT-767 Group. Mine has the 2 meter Transverter Module. Its neat to see another new member Joined yesterday. Just like it was a big thrill to have my FT-290R Join my GX Brothers in my shack. I am looking forward to next CX Contest in September and some Portable QRP SSB in the June Contest. I will be back after the CW Contest Back to fun with my Wonderful "You are Part of the Pile-up" QSK FT-757GX June '84 SN.
73
Gerry VE7BGP
|
329|329|2011-02-24 23:36:30|m0xvf|Re: 290 R Mk 2|
Hi all,
I have owned my Mk2 290 R since December,and love it for use portable and at the home QTH.Its works ok but there a couple of things I would like to put right as it were.The display bulb has gone (no suprise) and the audio on FM is "superb" apparently,but SSB audio lacks any punch,so I would like to ask forum members for any info on changing the display bulb(nightmare like the Mk1 ? ), and the location for the audio trimmer-is there a seperate adjustment for SSB audio ?
Many thanks and would appreciate any help.
Jeremy
M0XVF
|
330|330|2011-03-09 22:28:07|ve7bgp|FT-290R II Pdf Manual|
Hello All
I have added the FT-290 MKII owners Manual to the files Section this Morning.
73
Gerry VE7BGP
|
331|331|2011-03-27 23:59:51|rpcrichton|high (er) performance antenna|
Hi Group , I am looking for a screw in 1/4 wave to see if I can improve the performance whilst keeping my 290 mk 1 as original , I have all 6 sets mk 1 & 2 on 2 6 & 70cms in my collection.
Any suggestions
Best 73 from Stockport Uk Paul
|
332|332|2011-03-28 22:40:23|Andrew Davis|Re: whip antenna on 290R|
My 290R has the original screw-in whip which looks close to a quarter wave to
me, allowing for slight loading due to its proximity to the case etc. Any
longer antenna connected instead of that whip would not present the same
impedance to the radio.
________________________________
Andrew Davis
VK1DA Canberra --- VK2UH Yass
web:vk1da.info, vkfaq.ampr.org
|
333|333|2011-03-30 23:39:40|Jim|lost frequencies after a short caused a fault|
Hi I've got a problem I've just recently designed my own low noise pre amp based on the old ''mutek board 145snla'' and due to a cock up i caused a short on the 12v live feed to it and this resulted in the radio now only working from 144.000mhz to 145.995mhz, has anyone any ideas to get the frequencies back that I have lost ie 146.00mhz to 148.000mhz.
regards jim G1ASN
|
334|333|2011-04-02 10:09:11|Andrew Davis|Re: lost frequencies after a short caused a fault|
Hi Jim,
assuming you are referring to the 290R:
on mods.dk there is an article about how the 290R selects the frequency band, based on a set of diodes on the controller board. The combination needed could be found there.
Good luck fixing it.
Andrew Davis
VK1DA Canberra --- VK2UH Yass
web:
vk1da.info,
vkfaq.ampr.org
From: Jim Hi I've got a problem I've just recently designed my own low noise pre amp based on the old ''mutek board 145snla'' and due to a cock up i caused a short on the 12v live feed to it and this resulted in the radio now only working from 144.000mhz to 145.995mhz, has anyone any ideas to get the frequencies back that I have lost ie 146.00mhz to 148.000mhz.
regards jim G1ASN
|
335|335|2011-04-03 23:06:20|Liviu|FT290R squelch problems|
Hello,
I own for a long time, with my 23 cm and 3 cm DB6NT's Xverters, YAESU FT290R. Until now I was very pleased with "toy". He did excellent work. For some time I have a delicate problem. After starting, the first 20 minutes transceiver function normally and all commands ok. After 20 minutes, in FM mode, the squelch can not be stopped in any way and seems that squelch button has no function. Have the same RX, but only with squelch always on and that made me nervous. Now try to fix that bug.
I have INSTRUCTION MANUAL FT290R, all schematics inside, all units details, but MAIN UNIT details missing. Have anyone SERVICE MANUAL FT290R ? I need especially MAIN UNIT details.
Without this details, it is very hard to physical locate the components from the scheme drawn in FT290R INSTRUCTION MANUAL and positions in PCB. To find C97 and C94 in MAIN UNIT PCB, to extract and replace I spent almost all day. So it's hard to continue in that way, somewhere there must be a complete information about MAIN UNIT. coils, capacitors, transistors and resistors positions, voltages, bla bla bla.
Can anyone help me ?
Best regards
YO4FNG Liviu
|
336|335|2011-04-03 23:14:02|Jim|Re: FT290R squelch problems|
--- In
electrichandbag@yahoogroups.com, "Liviu"
|
337|337|2011-04-03 23:17:16|Jim|- lost frequencies|Hi Jim G1ASN here just to update I have since found a mod that dealt with my problem so I bit the bullet and opend up the rig and cut the jumper and the frequencies are now all back. Regards Jim G1ASN
|
338|335|2011-04-09 08:06:36|Liviu|Re: FT290R squelch problems|I need only complete MAIN UNIT PCB details. Resistors and capacitors positions on the PCB. Where can I find ?
YO4FNG
Liviu
|
339|335|2011-04-10 00:41:23|Liviu|MAIN UNIT 290R - Component layout diagrams/photos?|I can not believe that there is nowhere the MAIN UNIT (for 290R) layout diagram. Can not lose a lot of time to identify components from the pdf schematic to reality. Any help ?
YO4FNG
Liviu
|
340|335|2011-04-13 10:02:46|zaktherabbit|Re: MAIN UNIT 290R - Component layout diagrams/photos?|Unfortunately, the photograph in the manual is the only layout anyone has found.
I would create a full diagram if i could get hold of a scrap set to dismantle and map, but so far i havent been able to do this.
Im afraid the only way is to locate the parts using a multimeter and eyesight!
M
|
341|335|2011-04-13 13:04:28|Mansueto Grech|Re: MAIN UNIT 290R - Component layout diagrams/photos?|I too am looking for a board layout for the FT290R.
Cannot believe that Yaesu don't have or didn't make one for this model!!!!!!!!!
73's
Mans. 9H1GB
|
342|335|2011-04-13 18:21:58|rpcrichton|Re: MAIN UNIT 290R - Component layout diagrams/photos?|Hi group all the info is in the technical supplement, Now posting to the files page as a pdf in a zip file best 73s Paul m1bpt handheld and yaesu collector Stockport UK
|
343|2|2011-04-13 18:24:42|electrichandbag@yahoogroups.com|New file uploaded to electrichandbag |Hello,
This email message is a notification to let you know that
a file has been uploaded to the Files area of the electrichandbag
group.
File : /FT-290R_Allignment_and_schematic.zip
Uploaded by : rpcrichton <
m1bpt@... Description : Ft full schematic and main tx allignment technical supplement
You can access this file at the URL:
http://groups.yahoo.com/group/electrichandbag/files/FT-290R_Allignment_and_schematic.zip To learn more about file sharing for your group, please visit:
http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.html Regards,
rpcrichton <
m1bpt@...|
344|335|2011-04-13 19:46:31|Liviu|Re: MAIN UNIT 290R - Component layout diagrams/photos?|
Tnx answer, already saw that.
It's over my head to understand, at that time, how the guarantees were made all over the world in YAESU's representative office. I do not think they could afford to lose hours to identify the components on MAIN UNIT pcb. It would have taken forever to send the transceiver back to Japan for repair and to bring it to the buyer.
I will try to ask YAESU for help; in any case the MAIN UNIT layouts was first designed and made after a factory project. Any respectable company can provide plans for equipments out of production. I have appealed until today many companies for that kind of help and all sent me the required details. Has anyone done that before ?
YO4FNG
Liviu
|
345|335|2011-04-13 20:27:51|Andrew Davis|Re: MAIN UNIT 290R - Component layout diagrams/photos?|
Liviu,
I have an alignment manual PDF. But only a few selected components are identified. It is not a really detailed manual but perhaps it is of some help.
2.6 MB attached. it will be linked from this email but stored on Yahoo groups server.
73
Andrew Davis
VK1DA Canberra --- VK2UH Yass
web:
vk1da.info,
vkfaq.ampr.org
From: Liviu I can not believe that there is nowhere the MAIN UNIT (for 290R) layout diagram. Can not lose a lot of time to identify components from the pdf schematic to reality. Any help ?
YO4FNG
Liviu
|
346|2|2011-04-15 23:01:34|Liviu|Re: New file uploaded to electrichandbag|
Already have this. It's just a small extract from Instruction Manual FT290R and it's not what I was looking for.
Tnx anyway.
YO4FNG
Liviu
|
347|347|2011-04-15 23:38:35|jswarbrick@xtra.co.nz|Hi New Member|
Hi,
Greetings from New Zealand..
I'm currently waiting for delivery of an FT 290R II along with the 25w Amp, battery box, case, antenna,charger and the manual etc.. The rig wil give me some ability to get onto 2m SSB which is a mode I have not explored before.
I also like mountain topping so I'm hoping the 'new' rig will be good for that.
If anyone has some easy to follow plans for a 2m Yagi for SSB or FM work then point me in the right direction...
Also is there a particular type of 'c' cell that is reccomended for the battery box or is it better to run it off of a SLAB??
Thanks
John
|
348|347|2011-04-16 08:07:35|Geoff Blake|Re: Hi New Member|
Hi John and welcome
|
349|347|2011-04-16 10:10:39|jswarbrick@xtra.co.nz|Hi New Member|
Hi,
Greetings from New Zealand..
I'm currently waiting for delivery of an FT 290R II along with the 25w Amp, battery box, case, antenna,charger and the manual etc.. The rig wil give me some ability to get onto 2m SSB which is a mode I have not explored before.
I also like mountain topping so I'm hoping the 'new' rig will be good for that.
If anyone has some easy to follow plans for a 2m Yagi for SSB or FM work then point me in the right direction...
Also is there a particular type of 'c' cell that is reccomended for the battery box or is it better to run it off of a SLAB??
Thanks
John
|
350|347|2011-04-16 10:13:23|Andrew Davis|Re: Hi New Member|
John,
the designs for yagis are plentiful. You need to decide whether it's something you need to carry and assemble on site, or an antenna you can build and carry in assembled form. How long a yagi do you need, what are you aiming to achieve?
A search engine will yield plenty of hits. A lot of people have found Kent Britain's designs for "cheap yagis" quite easy to replicate and quite effective. Search for "cheap yagis" or WA5VJB.
Mountaintopping with 25w combined with a 4 element beam will yield moderate distances up to say 200km depending on terrain. Could be as low as 10km when surrounding mountains are higher, and when you are in an area without many locals active on 2m ssb. Generally a calling frequency or a sked will make all the difference. Random contacts on 2m ssb would be plain optimistic in the area I live in, but if you are near a major city it might be ok for you. It is common for there to be a time of day when locals like to make the best of conditions (typically early morning within an hour or two of sunrise) or propagation via aircraft reflections. Knowing when that time is, and the right frequency for making calls, will make a big difference to how many contacts are possible. Getting to know the local operators who use 2m ssb will also be helpful as they are a source of advice, possibly loan antennas and most importantly, contacts once you get on the band.
hope this helps...
73
Andrew Davis
VK1DA Canberra --- VK2UH Yass
web:
vk1da.info,
vkfaq.ampr.org
From: "jswarbrick@..." Hi,
Greetings from New Zealand..
I'm currently waiting for delivery of an FT 290R II along with the 25w Amp, battery box, case, antenna,charger and the manual etc.. The rig wil give me some ability to get onto 2m SSB which is a mode I have not explored before.
I also like mountain topping so I'm hoping the 'new' rig will be good for that.
If anyone has some easy to follow plans for a 2m Yagi for SSB or FM work then point me in the right direction...
Also is there a particular type of 'c' cell that is reccomended for the battery box or is it better to run it off of a SLAB??
Thanks
John
|
351|347|2011-04-16 22:48:00|zaktherabbit|Re: Hi New Member|
I use the designs of Martin DK7ZB -
http://www.qsl.net/d/dk7zb//start1.htm they are very easy and very forgiving. The 3-el field beam i use on 2m is made from tube and hardware from an old FM broadcast band antenna, Martin helped me with modifying the calculations to take account of the different material dimensions. The result worked so well first time i never bothered to improve it!
Martin G7MRV
|
352|347|2011-04-16 23:33:20|Liviu Babi|Re: Hi New Member|
hello John
my webpage:
http://www.qsl.net/yo4fng/You can see at 144 MHz button the complete detail for building DK7ZB antenna.
It's easy
73 !
From: zaktherabbit I use the designs of Martin DK7ZB -
http://www.qsl.net/d/dk7zb//start1.htm
they are very easy and very forgiving. The 3-el field beam i use on 2m is made from tube and hardware from an old FM broadcast band antenna, Martin helped me with modifying the calculations to take account of the different material dimensions. The result worked so well first time i never bothered to improve it!
Martin G7MRV
|
353|347|2011-04-17 21:39:50|John Swarbrick|Re: Hi New Member|
Hi Geoff,
Thanks for the welcome...
I have had a good look at SOTA. While we have some good hills and mountains here in NZ we do not have a SOTA association. Go Figure!!
Anyhow thanks for the advice.
Cheers
John
From: electrichandbag@yahoogroups.com [mailto:electrichandbag@yahoogroups.com] On Behalf Of Geoff Blake
Sent: Saturday, 16 April 2011 6:08 p.m.
To: electrichandbag@yahoogroups.com
Subject: Re: [electrichandbag] Hi New Member
|
354|347|2011-04-17 21:40:53|John Swarbrick|Re: Hi New Member|
Hi Andrew,
We have a similar situation here in NZ with activity levels on 2m SSB.
Anyhow I’ve been putting a few feelers out on the local nets so I can sort out some prearranged QSO’s etc...
Thanks for your thoughts and advice
73
John
From: electrichandbag@yahoogroups.com [mailto:electrichandbag@yahoogroups.com] On Behalf Of Andrew Davis
Sent: Saturday, 16 April 2011 11:50 a.m.
To: electrichandbag@yahoogroups.com
Subject: Re: [electrichandbag] Hi New Member
John,
the designs for yagis are plentiful. You need to decide whether it's something you need to carry and assemble on site, or an antenna you can build and carry in assembled form. How long a yagi do you need, what are you aiming to achieve?
A search engine will yield plenty of hits. A lot of people have found Kent Britain's designs for "cheap yagis" quite easy to replicate and quite effective. Search for "cheap yagis" or WA5VJB.
Mountaintopping with 25w combined with a 4 element beam will yield moderate distances up to say 200km depending on terrain. Could be as low as 10km when surrounding mountains are higher, and when you are in an area without many locals active on 2m ssb. Generally a calling frequency or a sked will make all the difference. Random contacts on 2m ssb would be plain optimistic in the area I live in, but if you are near a major city it might be ok for you. It is common for there to be a time of day when locals like to make the best of conditions (typically early morning within an hour or two of sunrise) or propagation via aircraft reflections. Knowing when that time is, and the right frequency for making calls, will make a big difference to how many contacts are possible. Getting to know the local operators who use 2m ssb will also be helpful as they are a source of advice, possibly loan antennas and most importantly, contacts once you get on the band.
Andrew Davis
VK1DA Canberra --- VK2UH Yass
web: vk1da.info, vkfaq.ampr.org
From: "jswarbrick@..." Hi,
That’s a really good website...
I’ve also got a load of bits from some TV antennas here so I’ll get into construction mode tomorrow. I should have enough bits for a couple of antennas. I might start with a simple one to get me on SSB after a fashion then look at a more refined design later..
I really like the fact he gives the differing dims for different diameters of elements etc...
Thanks a lot
73
John
From: electrichandbag@yahoogroups.com [mailto:electrichandbag@yahoogroups.com] On Behalf Of zaktherabbit
Sent: Sunday, 17 April 2011 8:46 a.m.
To: electrichandbag@yahoogroups.com
Subject: [electrichandbag] Re: Hi New Member
I use the designs of Martin DK7ZB -
http://www.qsl.net/d/dk7zb//start1.htm
they are very easy and very forgiving. The 3-el field beam i use on 2m is made from tube and hardware from an old FM broadcast band antenna, Martin helped me with modifying the calculations to take account of the different material dimensions. The result worked so well first time i never bothered to improve it!
Martin G7MRV
|
356|347|2011-04-17 21:41:37|John Swarbrick|Re: Hi New Member|Hi Liviu
Great website!!
Thanks for pointing me towards it..
73
John
From: electrichandbag@yahoogroups.com [mailto:electrichandbag@yahoogroups.com] On Behalf Of Liviu Babi
Sent: Sunday, 17 April 2011 9:31 a.m.
To: electrichandbag@yahoogroups.com
Subject: Re: [electrichandbag] Re: Hi New Member
hello John
my webpage:
http://www.qsl.net/yo4fng/
You can see at 144 MHz button the complete detail for building DK7ZB antenna.
It's easy
73 !
From: zaktherabbit Hi,
Well after a wee wait 'my' 290 arrived and I took it away with us over the easter break. I have had some good fun working pedestrian portable into the local repeaters using the c cell battery pack and the standard rubber ducky antenna.
I also had some fun tonight working into a 2m SSB net that we got together with a few QSO's to folk atound my home QTH here in Hamilton.
So I made my first 2m SSB QSO...
All in all I'm having fun.. Only 1 thing if the battery box is flexed slightly the rig cut off and you have to switch the rig off unmount the battery box remount and then switch on again.. Odd anyone got any ideas on this??
73
John
|
358|357|2011-04-25 23:36:49|zaktherabbit|Re: Easter Break with the FT 290 R II|Hi John,
Glad your having fun
Sounds like the terminals on your battery box my be a touch corroded/oxidised? A quick go over with a PCB rubber or a fibreglass pencil will clean them up nicely. Im not sure what the terminals are like, but its also possible they are just not making a great contact, and perhaps need a little tightening/adjusting?
Martin
|
359|357|2011-04-26 17:14:36|kf7bsf|Re: Easter Break with the FT 290 R II|John,
Martin's advice is "spot on" and you can also adjust the clips to get a more secure fit of the battery box as well. I have 3 battery boxes and discovered one of mine was slightly warped requiring a bit more tension to get a solid fit.
Gene/KF7BSF
|
360|360|2011-04-28 14:13:21|zaktherabbit|290 mk1 SLAB battery mod?|Im considering changing the C-cell NiCds and tray in my mk1 for a suitable 12v Sealed Lead Acid Battery (SLAB). The reason for this is that all my other battery supplies are of this type (ranging from 7Ahr to 38Ahr!), so it makes sense to change and use the same charger system (also makes adding solar power for field use a doddle).
Before i go stripping the rig, has anyone else on the group done this already? It would be easier if i could find out from someone whos already done it what spec/size battery to use, save me trolling through Yuasa's website looking at specs.
Martin
|
361|347|2011-04-28 14:17:25|zaktherabbit|Re: Hi New Member/SOTA|Sounds like the perfect excuse to contact SOTA and organise a NZ branch! ;-)
Im also a SOTA activator, although not as prolific a goat as some. Im hoping to get on one or two hills this coming week to make use of the royal wedding callsign NoV.
Incidentally, i use a fibreglass fishing pole as a SOTA mast, its 10m long but has to be used lower (thicker sections) for VHF beams etc, but its incredibly versatile. Theres a photo of my bungee guying system in the photos section
Martin
|
362|335|2011-04-28 14:19:31|zaktherabbit|Re: Component layout diagrams - junk set request|My offer still stands to organise this if anyone does have a dead/junk set to offer.
It would take me quite some time, but we would then have a complete guide to what parts are where
M
|
363|363|2011-04-28 21:52:17|rfload|FT-290RII mods|Hi All,
Is there a way to modify the FT-290RII frequency range from 144 - 146 MHz to 144 - 148 MHz ?
Thanks
Muliawan
YD1BQV
|
364|363|2011-04-28 23:15:31|zaktherabbit|Re: FT-290RII mods|Take a look in the files section, theres a file called 'all possible mods' or something similar, the frequency range mods are in there
Martin G7MRV
|
365|365|2011-04-28 23:47:35|David|Back up battery|I have found the back up battery has run down, giving intermittent tuning action. Does anyone know how to buy a new one? It is a button cell with two solder lugs. Thanks.
73
Dave
G3PVH
|
366|365|2011-04-29 14:44:44|dbztuzujdhgtrjzthxh|Re: Back up battery|Hi Dave,
you can buy an exact replacement, but they can be hard to come by and often have sat on a shelf for some time.
An easy alternative is to fit a socket and use a common cell (CR2025) used on PC motherboards (the socket can be easily salvaged from an old motherboard too).
I can upload some pics if you want to know just how easy it is.
ian.
|
367|365|2011-04-29 14:45:17|Andrew Davis|Re: Back up battery|Hi Dave,
I had that problem in mine too.
I could not find an equivalent type with solder lugs in the right places. For a very small cost, less than the value of the cells themselves, I bought a cell holder and soldered that into the board. I can now swap a new cell into the radio without any soldering. I did have to drill a hole in the board to take one of the pins on the holder, but that's all. And the plain cells that are used in other devices (CR2025?) are readily available.
This process required the board to be moved slightly out of its normal position to allow safe drilling and to allow access to the reverse side of the board. Let me know if you need any other info about how to install the holder.
Having used the radio for a few years without memory backup it is still a thing of great wonder to turn it on and find VFO A and B still on the previous frequencies and to find the memory frequencies are still correct. I use mine as an IF for 13 and 9 cm, one requiring 144 and the other requiring 147 so having those frequencies in the two vfos is very convenient.
73
Andrew Davis
VK1DA Canberra --- VK2UH Yass
web:
vk1da.info,
vkfaq.ampr.org
From: David I have found the back up battery has run down, giving intermittent tuning action. Does anyone know how to buy a new one? It is a button cell with two solder lugs. Thanks.
73
Dave
G3PVH
|
368|365|2011-04-29 22:22:01|David|Re: Back up battery|Hi Ian and Andrew
Thank you very much for the advice. I will get a battery holder.
73
dave
|
369|221|2011-05-07 07:30:19|kf7bsf|Re: FTS-7 Mismatched connectors!|Greetings All!
Though it's been a year since I've followed up on this issue, I do monitor the Group and enjoy that so many people are still enjoying the FT-290 series radios. I now have a set of 3 Mk 2's in 2m, 6m, & 70cm. I call it my tri-bander stack. Great little rigs!
I'm back to resolving the tone board issue in this email thread. I have a FTS-7a that I need to trade and/or modify for an earlier FTS-7 rig connector. If anyone has any suggestions I would appreciate any information I can get.
I may just break down and build an external tone board and even see if I can figure out a way to switch it between the 3 rigs, but I'm just poking to see what suggestions or trades might be out there.
Does anyone need an FTS-7a tone board?
73 de Gene/KF7BSF
|
371|288|2011-05-07 07:33:59|kf7bsf|Re: Looking an FT-790 mk2 Technical Manual|Back again!
I still would like to obtain a technical manual for the 790 Mk2 & 690Mk2. Anyone have any resources on these?
73 de Gene/KF7BSF
|
372|372|2011-05-07 07:40:17|kf7bsf|Mk2 Battery Box|Greetings Mk 2 fans!
I recently inventoried my Mk 2 gear and discovered I have a spare battery box. If anyone needs one send me a PM.
I'm uncertain of the policy on making such an announcement, so if the moderators need to delete this post I'll understand.
73 de Gene/KF7BSF
|
373|221|2011-05-09 03:59:51|kf7bsf|Re: FTS-7 Mismatched connectors!|UPDATE!!!
After looking into the tone board connector a bit further, it is NOT the tone board that is the issue, but the connector inside the radios. My 2m has the correct connector and my 6m and .70cm rigs have the newer connectors.
SO!!!
Looks like I need to salvage a couple of connectors from some parts rigs. Anyone out there collecting parts rigs? I have given up on find a supplier for the original parts and may update the board and harness connectors, but I'm more hesitant to change the board connector.
Again any information would be appreciated. I'm sure someone out there has or knows something.
Gene/KF7BSF
|
374|374|2011-05-12 10:16:23|kf7bsf|Power Problems?|Group,
I have amassed a trio of ft-x90RII radios. I'm hooked on these things. What great little rigs. I have been using my FT-290RII as a base station for about 1 year and it's a treat. I have the FL-2025 amp and get about 3w on low power and 25w on high power. I use it regularly on the repeaters and the high power gets me respectable ssb use on the local net. The only real shortcoming is the single pl-tone limit without taking the amp off.
However, I recently got my 70cm 790 on the air and though I could hit the local repeater just fine, the power output is extremely low. With the FL-7025 amp, I'm showing about 1w on low power and a little over 1.5w on high power. I've double checked all my connectors between the amp and the ps, but no difference. I tested the unit in cw mode directly into a dummy load with no change.
To add to the puzzle, my 6m 690 rig with the FL-6020 is exhibiting the same low power readings under the same circumstances.
My next test will be to remove the amps and test the rf output using the battery pack to determine if the base unit is producing the expected 2.5w on high power. That would help eliminate an amp vs. rig problem. I also plan to repeat the tests using my clubs calibrated meter as well.
My question is this, are there know issues that I should be looking for as I track down this power output problem?
I would appreciate any insights anyone could share regarding this. This is the only place I know of to ask these questions.
73 Gene/KF7BSF
|
375|2|2011-05-18 08:47:50|electrichandbag@yahoogroups.com|New file uploaded to electrichandbag |Hello,
This email message is a notification to let you know that
a file has been uploaded to the Files area of the electrichandbag
group.
File : /FT790R_user_it.pdf
Uploaded by : ndrngl2004 <
angeloandreoletti@... Description : the 70 cm handbag manual in italian
You can access this file at the URL:
http://groups.yahoo.com/group/electrichandbag/files/FT790R_user_it.pdf To learn more about file sharing for your group, please visit:
http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.html Regards,
ndrngl2004 <
angeloandreoletti@...|
376|376|2011-05-18 22:04:41|GM8BJF|Usual AGC desensing fault - successful fix|
The FT290R Mk1 that I use for Microwave portable operation as an IF radio has been showing the ususal desensing due to the AGC voltage rising and pushing the S meter full scale in the absence of a signal.
The fault only came on when out /P and when the weather was cold which is normal in GM.
Back home (in the warm)the radio was fine. I could induce the fault with a can of freezer spray applied around the area of Q1014 and D1028 - 30. After a bit of floundering around replacing components in that area to no avail, I did the Mod described by G3LLL, adding a 47k resistor between the base and emitter of Q1014 and it seems to have effected a cure. The radio can now be left in the domestic enviromental test chamber (aka refrigerator) overnight and comes out working fine in the morning.
I feel sure that it was a bit of dodgey design on Yaesu's part not to have a load resistor on the output of the AGC rectifiers and simply depend on the transistor base current to load the diodes. I am not sure quite why it only shows with age, but I suppose that as they are all at least 25 years old now and entitled to be a bit dicky!
Hope that is of some use,
73s
Brian, GM8BJF.
|
377|376|2011-05-19 08:43:35|Andrew Davis|Re: Usual AGC desensing fault - successful fix|
Brian
Thanks for posting that result, it is good to know of that cure though mine has yet to display the problem. Must admit I tend not to operate often at 2C and lower but it does happen sometimes in the morning on field day at 1800m.
Regarding Yaesu's design, I am frankly amazed that these radios are still operating at all, given my experiences with other gear of that era and earlier. Getting it to work from one year to the next was sometimes an achievement. The fT2FB fm mobile used to be inoperative most of the winter mornings until I was half way to work, possibly due to negative C temps. Would have been useless in your climate...
73
From: GM8BJF The FT290R Mk1 that I use for Microwave portable operation as an IF radio has been showing the ususal desensing due to the AGC voltage rising and pushing the S meter full scale in the absence of a signal.
The fault only came on when out /P and when the weather was cold which is normal in GM.
Back home (in the warm)the radio was fine. I could induce the fault with a can of freezer spray applied around the area of Q1014 and D1028 - 30. After a bit of floundering around replacing components in that area to no avail, I did the Mod described by G3LLL, adding a 47k resistor between the base and emitter of Q1014 and it seems to have effected a cure. The radio can now be left in the domestic enviromental test chamber (aka refrigerator) overnight and comes out working fine in the morning.
I feel sure that it was a bit of dodgey design on Yaesu's part not to have a load resistor on the output of the AGC rectifiers and simply depend on the transistor base current to load the diodes. I am not sure quite why it only shows with age, but I suppose that as they are all at least 25 years old now and entitled to be a bit dicky!
Hope that is of some use,
73s
Brian, GM8BJF.
|
378|365|2011-05-19 23:06:49|David|Re: Back up battery|many thanks to everyone, rig working again fine. What a miracle.
73
dave
|
379|379|2011-06-16 21:46:52|Jim|spare mic wanted|Hi, does any one have a spare/unwanted YM-47 mic that they would be willing to part with if so contact me by my email. yours jim G1ASN
|
380|380|2011-06-19 04:53:48|ZL1SWW|Where to mod the board for AGC fault - Meter hard over.|Hi All,
I decided to have a look at my FT290 again after it had the meter at FSD for half an hour when I tried to have a contact on my 3.4GHz transverter as my FT-817 was running on 1296.
This was getting frustrating so dug inside to do the AGC mod. Didn't have 47k SMD resistor on hand so used a 56k. It works OK.
As this radio is such a pig to service, I decided to take some photos with the thought it might benefit others. Using a bright light and the pace desolderer, I could identify the pads.
I have pushed up a folder with 3 photos of the relevent details. I use SMD as it will not foul the battery case and like SMD anyway.
Look for the "AGC FAULT MODS" folder in the files area.
Cheers,
Simon
ZL1SWW
|
381|381|2011-06-21 18:34:37|Jim|AGC FAULT ON 790 MK1|Hi I have a 790 mk1 with I think the same problem the power meter is hard over to full deflection when I switch on would this be an AGC fault?. I have a picture of the possible point on the underside of the circuit board and I will load it up into the photos section of the electric handbag site as ''AGC FAULT ON 790 MK1'', I would be glad of your input and advice yours 73 jim G1ASN
|
382|381|2011-06-25 09:34:41|ndrngl2004|Re: AGC FAULT ON 790 MK1|Ciao jim,
my 790 was in similar condition display off, meter at the end of the scale, no audio.
I turn on the display with new caps in the vr 1012 zone and adjusting it for 5,7 V on the catode of diode 1060 just on it's side. the meter and the display are now normal and I can listen a noise of a frie pan for a wile and the silence come again. the noise came bach if I leave the radio off for a wile. then the tragedy :-)))))). I attempt to repair in the late evening and I was so tired also because it a pain in the *** to work in this area. I can't even belive how I can do it but I detach the black wire soldered on the shield visible in your photo and i cant recognize were it was soldered!!! if you have the radio still open please tell me were I have to put it!
73 de Angelo iz0tut
|
383|383|2011-07-04 11:57:01|Michael|UK Service / Alignment?|Does anyone know of somewhere in the UK that I can get
one of these rigs serviced / realigned? I've acquired a
Tokyo VHF- but there is a fair RX/TX frequency split at the moment.
TIA
Mike
|
385|383|2011-07-04 14:13:11|GD1MIP|Re: UK Service / Alignment?|Mike Castle get lots of good feedback. but if your in the NW of England try Harry Leeming (contact details in PW)
Andy
GD1MIP
|
386|386|2011-07-10 17:09:52|Anthony|ft 290r|My 290 has gone deaf on usb & cw,lsb & fm are ok, anybody has any idea,
Thanks in advance Tony.
|
387|386|2011-07-10 18:48:58|zaktherabbit|Re: ft 290r|Tony, has the S-meter peaked out as well?
Martin G7MRV
|
388|383|2011-07-11 09:43:48|Michael|Digital Modes?, was: Re: UK Service / Alignment?|Thanks for the replies, now for the next question :-)
Has anyone used these rigs for digital modes?
The reason I ask is I have a Tokyo HF transverter
teamed up with the 290, and it works extremely well
on PSK31 for receive, but I'm having difficulty
actually getting QSO's. My suspicion is the modulation, as
adjusting the volume of the drive is giving me an 'all or
nothing' response on the power/swr meter. Any advice for
digital with the venerable beasty?
By the way, I have attempted to check by listening with
a second receiver, but even with a dummy load, it completely
overloads the front end.
cheers
Mike G8LKD
|
389|386|2011-07-11 09:44:43|Andrew Davis|Re: ft 290r|Tony,
I think you are saying that it is deaf on usb & cw, whereas lsb and FM are ok.
Idea:
The USB and CW modes share a common bfo crystal. LSB has a different one, and FM brings in the FM IF without any BFO needed.
I therefore would check for signal from the BFO if you:
a. can locate it on the board
b. have a receiver or other suitable test gear to check its signal and frequency.
You should find that there is a signal from the BFO on LSB mode, but perhaps none on USB and CW. There should not be one on FM either.
Look at the circuit and see whether a failure of the BFO on USB/CW may mean a component has gone faulty in the oscillator - I would suspect an electrolytic capacitor bypassing the supply voltage, or possibly a bias resistor or the active device itself. The last thing I think would cause this would be a faulty crystal but that could happen.
73
From: Anthony My 290 has gone deaf on usb & cw,lsb & fm are ok, anybody has any idea,
Thanks in advance Tony.
|
390|386|2011-07-11 18:01:22|Anthony|Re: ft 290r|
OK Andrew i'll check the bfo & xtal,I thought it might be the xtal but at least I no where to look now,its not completely deaf just a higher pitched hiss plus muted sound,thanks for your help
Tony
|
391|386|2011-07-11 18:01:33|Anthony|Re: ft 290r|
No just much higher pitched hiss & muted audio
Thanks for help
Tony
|
392|386|2011-07-11 18:04:04|zaktherabbit|Re: ft 290r|
ok, in that case then i would also go with Andrews opinion. Mine was originally off on one of the sidebands (cant remember which) and needed the BFO aligning. The symptoms for that were higher pitch noise, although i dont recall the effect on sensitivity
Martin G7MRV
|
393|393|2011-09-09 08:26:29|gsmendelson|Charging connector for FT290R II specs?|
I have an FT290R mark II with the battery pack. The battery pack has 2 sockets on the side for power. One is a large one to power the radio, the small one under it is to charge the batteries.
Looking at the schematic, if you put a plug into the charge socket it disconnects the batteries from the radio and you can safely charge the batteries in place.
Being a 1995 vintage radio, it was designed for ni-cads and was just a low current power supply. It would charge the batteries in about 12 hours and if you removed it within 3 days, not cook the batteries.
I no longer have the charger. In the pack I have 2500 mAh nickle metal hydride AA cells in sleeves. This give me a lot more power than the C sized ni-cads I used to have.
I charge them with a smart charger that shuts off when it detects the cells are charged, so they are safe without a thermal cut-off.
BUT (there's always a but, isn't there) I can't find a plug that will fit the charge socket. So for now, I remove the battery pack from the radio and connect crocodile clips to the round holes on the top of it to charge it. I've tried several different plugs that "fit", some never make contact to the center pin, some contact the center pin, but not the outside.
Most are just too big.
So if you are still reading this and have the proper charger, would you please measure the diameter of the hole in the middle and the outside of it?
Thanks in advance,
Geoff.
Geoff Mendelson 4X1GM/N3OWJ
|
394|393|2011-09-11 15:02:03|barrycrossley@ymail.com|Re: Charging connector for FT290R II specs?|
Geoff
I recently purchased a second hand FT290R mkII without a battery box or charger. I managed to locate a brand new battery box but still no charger, so ended up buying a new specialist nicad charger. The plug that came with the charger was of course the wrong size.
I managed to find an old power adaptor with multiple plugs and one of these fitted. The outside diameter is 4mm but I am having trouble measuring the centre pin diameter - it seem to be 1.5mm.
Watch out for polarity though, it is centre negative.
Hope this helps.
Barry
M1CHF
|
395|360|2011-09-27 09:23:09|Robert|Re: 290 mk1 SLAB battery mod?|
Hi Martin
An older thread but myself and a friend have been considering doing the same sort of mod. Did you press on with it and if so how did it work?
Rob
|
396|396|2011-09-27 09:28:14|Robert|Swapping Mutek to another rig?|
I have a non Mutek 290r in good condition and a friend has passed me his 290r to take the Mutek board out and transfer to mine (on the basis his FT290 only gets used to monitor the local repeater). Only slight concern is the instructions for the install suggest some mods carried out when installing the Mutek may not be that straightforward to reverse. Has anyone taken out a Mutek board from a FT290r so the donor remains viable or is this going to give some problems in re-commissioning? I have not started work on this yet and its highly likely opening up both rigs and doing a side by side comparison will reveal a few clues but it seemed to make sense to ask for some input first!!
Rob MJ0RZD
|
397|397|2011-09-27 13:24:08|rpcrichton|Antenna required|
Hi Group I have 2 immaculate ft 290r one mutec on Sunday I was on a raynet duty when the wind blew the 290 off its picnic table and snapped the original telescopic antenna , does perchance anybody have a spare for sale or know where I may get one.
best 73s Paul m1bpt
|
398|396|2011-09-27 14:06:14|gi0gdp|Re: Swapping Mutek to another rig?|
|
399|396|2011-09-27 16:09:17|Michael|Re: Swapping Mutek to another rig?|
I currently have two FT-290, and one Mutek, which isn't in either of them. Having reviewed the fitting instructions, I don't think I have the nerve to try it, so if anyone wants the board, please tell me. Alternatively, if anyone thinks they can fit this to one of my rigs
for a reasonable fee, please tell me.
Mike
|
400|396|2011-09-27 17:10:42|zaktherabbit|Re: Swapping Mutek to another rig?|
Rob,
Perhaps a simpler idea, if both rigs are in similar condition, would just be to swap the entire rig?
Martin G7MRV
|
401|396|2011-09-27 18:28:53|Robert|Re: Swapping Mutek to another rig?|
Thanks for the feedback guys!
To answer the replies so far, swapping the rigs did cross my mind already but to be brutally honest the mutek rig is a bit rough (though swapping out the casing etc could make the difference), I suspect the 'spare' Mutek board would be sought after if you put it up for sale, last I saw one on ebay it went for about £70, I wouldn't insult your intelligence by saying something like 'send it over'!!!! ;o)
Thank you to Jim for the email and uploading the photos, this looks like an entertaining weekend project, time to get the lead solder out..., again!!!
73 de Rob MJ0RZD
|
402|396|2011-10-03 22:20:44|geoffrey mendelson|Re: Swapping Mutek to another rig?|
On Sep 27, 2011, at 6:10 PM, zaktherabbit wrote:
Even better idea. Buy him a $35 (plus postage) BAOFENG.
73,
Geoff.
--
Geoffrey S. Mendelson, N3OWJ/4X1GM
|
403|403|2011-10-11 17:20:38|siggi.ingason@gmail.com|FT-290R for sale + PYE Power supply + Mobile Mount|
Hi,
I have a FT290R is very good condition with the original leather case, mike etc. I also have all the packing and instruction manual, circuit diagram and the NiCad charger NC-11C. The power supply is made by PYE and although old it's in good working order. The mobile mount has been stored in the garage and is in fair condition but again is in 100% working order.
At the moment this is not advertised anywhere else, but I will be placing it on other forums next week.
If anyone is interested in the lot, then let me know. If tyou want more details or if required I can send photos of the rig etc..
I'm looking for £115 + Postage (UK only).
Siggi (near Southampton)
siggi.ingason@... G4/TF3SI
|
404|292|2011-10-11 17:59:43|adrian_b_a|Re: 290R fault|
--- In
electrichandbag@yahoogroups.com, "hennessyben@..."
if all else fails take of top lid with 2 screw and apply hairdryer for a few min to the contents ( I did it whilst powered up and I could see the s meter returning to zero).
Hope that helps fellow sufferes
kind regards
Adrian G4JGH|
405|292|2011-10-11 20:23:25|Liviu Babi|Re: 290R fault|
Sorry, have to say that changing capacitors it's the only and unique solution. Replace them with tantalum type.
I have done that and for now the problems were solved. This thing took me almost two complete weeks and not without adventures. Transceiver several times and have not started. Be very careful to the wires that cross the main unit, very easy to break.
FT290R is built in the 80s and it is difficult to do "surgery" on him. Several times I wanted to throw him to the ground or throw it away.
The hardest thing is to locate the capacitors on the pcb's back face, because it's nowhere to find a complete description of the main unit. There is no manual to contain details about the main unit. View my posts on the forum.
I wish you success, patience and good eyes
keep in touch
YO4FNG
Liviu
|
406|292|2011-10-11 20:55:34|Gordon JC Pearce|Re: 290R fault|
On Tue, 11 Oct 2011 11:23:23 -0700 (PDT)
Liviu Babi <
electronicguest@... It's probably better to replace them like-for-like, if you're going to replace them at all.
*For now*, yes. I don't know why you'd replace perfectly okay electrolytics with horrible unreliable tantalum bead caps. You get about ten years out of them before they fail dead short...
The through-hole components are certainly awkward, crammed in like that. Fortunately I work on a lot of old gear and already had soldering iron tips in "oh you've got to be kidding" size. It's kind of fun though, feels a bit like being a blacksmith at a forge after working on normal-size surface mount stuff all day ;-)
--
Gordon JC Pearce MM0YEQ <
gordonjcp@...|
407|292|2011-10-11 21:35:06|GM8BJF|Re: 290R fault|
I have a couplke of FT290R Mk1s I use as microwave IF radios. I had exactly this problem and found that the mod described by G3LLL was a good fix. I posted about this back in May. This is what I said at the time.
"The FT290R Mk1 that I use for Microwave portable operation as an IF radio has
been showing the ususal desensing due to the AGC voltage rising and pushing the
S meter full scale in the absence of a signal.
The fault only came on when out /P and when the weather was cold which is normal
in GM.
Back home (in the warm)the radio was fine. I could induce the fault with a can
of freezer spray applied around the area of Q1014 and D1028 - 30. After a bit of
floundering around replacing components in that area to no avail, I did the Mod
described by G3LLL, adding a 47k resistor between the base and emitter of Q1014
and it seems to have effected a cure. The radio can now be left in the domestic
enviromental test chamber (aka refrigerator) overnight and comes out working
fine in the morning.
I feel sure that it was a bit of dodgey design on Yaesu's part not to have a
load resistor on the output of the AGC rectifiers and simply depend on the
transistor base current to load the diodes. I am not sure quite why it only
shows with age, but I suppose that as they are all at least 25 years old now and
entitled to be a bit dicky!
Hope that is of some use,
73s"
Also if you search on G3LLL on this site you will find the original mod. I did have a go at changing caps but that was absolutely no use ofr me.
73s
Brian GM8BJF
|
408|292|2011-10-11 22:40:21|Gordon JC Pearce|Re: 290R fault|
On Tue, 11 Oct 2011 19:12:32 -0000
"GM8BJF" <
brian.flynn@...
Judging by the callsign you've been at it longer than I have, but in around 25 years of repairing electronic stuff I've replaced maybe half a dozen electrolytic capacitors. Two of them were very recently and clearly popped smoothing capacitors on a PC motherboard, and were the only ones I can say for certain were the only part at fault; the others were implicated but not exclusively to blame in various odd analogue faults.
In the interests of full disclosure I'd like to point out that I'm omitting the many, many dried-out electrolytics in Amstrad satellite receivers that I used to fix as a Saturday job at a TV repair place when I was at school. They were bloody horrible things and I'm not sad to see the back of them. There's a house with one of the old Astra 1 dishes still on it with the big AMSTRAD pink-and-white logo that I drive past on my way to work every morning, it still makes me shudder...
--
Gordon JC Pearce MM0YEQ <gordonjcp@...|
409|292|2011-10-11 23:22:37|Geoff Blake|Re: 290R fault|On 11 October 2011 21:40, Gordon JC Pearce <
gordon@... I would be careful. After a lifetime of working on professional test
equipment (HP, Tek, MI, Wayne Kerr, Rohde & Schwarz, etc) I can tell
you that certain types of aluminium electrolytics are prone to failure
after 20 years or so. Faults may not be obvious, short circuits are
rare, but leaky or major reduction in value are quite common. Similar
applies to bead tantilums.
Frequently certain manufacturers equipment - not using the best of
electrolytics - exhibited a serious drop in performance, but nothing
you could put a finger on. A complete replacement of all electrolytics
would often bring a miraculous improvement in performance.
No doubt the same will apply to the FT290.
73 Geoff G8GNZ
--
###############################################
Geoff Blake, Â G8GNZ Â Â JO01fq: Â Chelmsford, Â Essex, Â UK
<
geoff@... Using Linux: Ubuntu 11.04 on Intel or Debian on UltraSparc
and even on the NAS. Â Â Avoiding Micro$oft like the plague.
###############################################
|
410|410|2011-10-14 16:17:45|jmrhzu@btinternet.com|Reviving an old FT290R|Hi
I'm new to the group and I've just bought a mk1 FT290R that is in a slightly sorry state and I'm in the process of repairing it.
It had several faults and it looked like the previous owner gave up trying to repair it.
The two main faults on mine were lack of Tx power and the s meter was sticking over on receive. Both these were easy to fix and I was pleasantly surprised how accessible the main RF board was in terms of desoldering and swapping out parts (compared to other portable radios that is)
It was also miles out of alignment and I'm in the process of following the alignment guide. Not too impressed with the presentation and methods in the guide but so far so good.
This radio has the little Mutek board in it and the receiver certainly seems very sensitive.
The mode switch is loose so at some point I'll have to see how easy it is to remove the front panel. Anyone got any useful tips on how to get the front panel off?
Regards
G0HZU
|
411|410|2011-10-14 18:14:34|Gordon JC Pearce|Re: Reviving an old FT290R|On Fri, 14 Oct 2011 11:29:26 -0000
"
jmrhzu@..." <
jmrhzu@... I must get around to swapping my Mutek from one to the other
Take it to your friendly neighbourhood radio-fixing enthusiast and get them to do it. Remain out of earshot if your sense of decency stops short of foul language.
No? Okay, well then if you take off the strap buttons and large Philips screws on the sides you can get at smaller Philips screws that hold the front panel bracket on. Unscrew the aerial, and with your ridiculous 50W car battery terminal soldering iron remove the braid from the aerial tube. You can now pull the front forwards a tiny bit, enough to get at the connectors.
You might not need to do this if all you want to do is tighten the mode switch, since if you whip the bottom covers off to get at the batteries you can see the big blue mode switch right there in the middle. Pull the knob off the splined shaft and nip up the slotted nut.
--
Gordon JC Pearce MM0YEQ <
gordonjcp@...|
412|410|2011-10-15 01:16:38|g0hzu|Re: Reviving an old FT290R|
Hi Gordon
Thanks for the hints.
Ideally, I'd like to remove the whole front panel so I can also clean some dust out from the LCD area behind the front lens but if I can do the mode switch as you have suggested I think I'll leave the dust where it is :)
I also have a Standard C58 here which was the alternative to the 290 back in the early 1980s. I've had the C58 about 25 years and it's still working fine.
I've got the 290 aligned now although I also had to adjust the PA bias to get good SSB audio quality. There didn't seem to be any instructions how to do this so I set it for the lowest bias that sounded good enough.
The overall instructions for the synthesiser alignment were quite odd
in the manual and I ended up using my own approach in order to get the frequency as accurate as possible for SSB on the clarifier etc.
Sadly, this 290 is missing its internal battery holder so I'll have to get one of those from ebay and it also doesn't have the leather? case or strap.
Regards
Jeremy
G0HZU
|
413|413|2011-10-15 13:23:45|Geoff Blake|Re: Setting up the clip-on linear FT290RII|
Hi All,
Does anybody have any info on setting up the clip-on linear for the
FT290RII please. I believe that there are two versions, a 10W and a
25W versions. I am not certain which I have.
Thanks Geoff G8GNZ
--
###############################################
Geoff Blake, Â G8GNZ Â Â JO01fq: Â Chelmsford, Â Essex, Â UK
<
geoff@... Using Linux: Ubuntu 11.04 on Intel or Debian on UltraSparc
and even on the NAS. Â Â Avoiding Micro$oft like the plague.
###############################################
|
414|410|2011-10-15 22:35:17|GM8BJF|Re: Reviving an old FT290R|
The battery holders for 4 "C" cells are available from Maplin. Two are required. Can't remember the part number but their one is pretty much identical to the original. I had to do this to mine as the originals had disintegrated.
73s
Brian,
GM8BJF.
|
415|415|2011-10-15 22:35:34|g0hzu|FT290R mk1 Schematic Merged Widescreen Version!|
Just to let you know I've uploaded a merged version of the FT290R mk1 schematics into the file area.
I got fed up going cross eyed tracing the discrete pages so here is a super widescreen version created in paint shop pro.
You can see the joins but it's still very useful.
FT290R mk1 Schematic Widescreen Version
Enjoy!
Regards
Jeremy
G0HZU
|
416|413|2011-10-15 22:35:47|g0hzu|Re: Setting up the clip-on linear FT290RII|
Hi Geoff
I've uploaded the FL-2025 intro manual with schematics to the files area here:
FL-2025 Manual
You can see it uses a Mitsubishi power brick inside M57727 to get 25W on 2 metres.
Hope this helps
Jeremy
|
417|413|2011-10-16 01:54:08|Geoff Blake|Re: Setting up the clip-on linear FT290RII|
Thanks Jeremy, a quick job for tomorrow.
73 Geoff G8GNZ
|
418|410|2011-10-16 22:07:44|g0hzu|Re: Reviving an old FT290R|
Wow thanks for this info, Brian.
I'll check out the battery holders the next time I'm in Cheltenham.
Regards
Jeremy
G0HZU
|
419|410|2011-10-16 22:27:37|geoffrey mendelson|Re: Reviving an old FT290R|
On Oct 16, 2011, at 1:58 AM, g0hzu wrote:
You may want to get AA holders instead. I replaced the C cells in my
290R II with AA long discharge NiMH batteries. They are available
almost everywhere, hold 80% of their charge a year, can easily be
recharged and at 2500 mAh, hold a lot more than the NiCad batteries
they replaced.
The Mark II uses a different case design, it is custom fitted for the
C batteries, so I had to use adaptor sleeves. This gave me no power,
the AA batteries top is slightly shorter than the C cells. I had to
put metal washers on the tops of them to make contact. Because of the
annoyance of putting it back together and still making contact, I
charge the batteries in the case.
Geoff.
--
Geoffrey S. Mendelson, N3OWJ/4X1GM
My high blood pressure medicine reduces my midichlorian count. :-(
|
420|415|2011-10-18 18:11:18|R Kelly|Re: FT290R mk1 Schematic Merged Widescreen Version!|
Hi Jeremy, Many thanks for taking the time to re-draw the schematic,
It makes things a whole lot easier.
best 73 Richard.
|
421|415|2011-10-18 19:16:21|Mansueto Grech|Re: FT290R mk1 Schematic Merged Widescreen Version!|
Hi Jeremy,
I keep getting Document cannot be found error when I click on the link. Am I doing something wrong?
73's
Mans. 9H1GB
|
422|415|2011-10-18 20:30:33|Gordon JC Pearce|Re: FT290R mk1 Schematic Merged Widescreen Version!|
On Tue, 18 Oct 2011 19:16:18 +0200
Mansueto Grech <
mansueto.grech@... This is because Yahoo! Groups insist on this totally clownshoe naming scheme for files, where they pack about an extra 128 random characters into the URL. Presumably, this is so that when you attempt to send the link in an email bits of it get lost as it wraps around several lines.
You can get to the file from the Files section of the Yahoo! Group pages, or you can follow this link here:
http://tinyurl.com/5ujktqe Finally, I've taken the liberty of uploading it to my own webserver in case anyone *still* has trouble with it - Yahoo! seemed reluctant to serve the file at all. Here it is:
http://www.gjcp.net/media/ft290_schem11.jpg If anyone else needs any files similar to this hosted, without jumping through Yahoo's hoops, then drop me an email off-list. As long as you've got the rights to distribute them, I'm happy to host them.
--
Gordon JC Pearce MM0YEQ <
gordonjcp@...|
423|415|2011-10-18 22:07:44|Mansueto Grech|Re: FT290R mk1 Schematic Merged Widescreen Version!|
Hi Gordon,
Thanks for the reply and the link
Again thanks 73's
Mans. 9H1GB
|
424|415|2011-10-24 20:18:19|JMR|Re: FT290R mk1 Schematic Merged Widescreen Version!|
Hi Mans
Sorry but I made an error with the link (it doesn't work!) but you can still find the widescreen schematic if you look in the Files area of the EH group.
This is over in the left column on the ElectricHandbag homepage. Just click on 'Files' and it should be amongst all the files stored there.
Regards
Jeremy
|
425|425|2011-10-27 13:10:47|Michael|Mutek for sale|
I've put the Mutek board I don't really
feel like installing on Ebay.
It's item number 160672632281 on ebay.co.uk if you
are interested. I've never seen it working
so I'm offering a 14 day money back on return.
cheers
Mike
|
426|426|2011-11-13 23:51:06|g0hzu|FT290R mk1 RF tests|
I've done a load of RF testing on my recently acquired mk1 290 and wondered if this might be of interest.
Therefore, I've posted up a folder in the files area called "FT290R Tests by G0HZU"
At the minute there's only one document in there and this shows the audio response of the radio for FM pre-emphasis and de-emphasis.
It also shows the combined (cancelled?) effect of these when two FT290rs 'meet' on the air.
There's also a plot of SSB audio response.
I've done a whole load more testing eg synthesiser phase noise and receiver tests and transmitter tests for linearity etc and I'll try and add more docs in the near future.
Regards
Jeremy
G0HZU
|
427|426|2011-11-14 19:49:23|zl1ujg|Re: FT290R mk1 RF tests|
Hi,
Nice work on the tests of the 290 Mk1.
Kevin ZL1UJG
|
428|426|2011-11-15 12:50:49|g0hzu|Re: FT290R mk1 RF tests|
--- In
electrichandbag@yahoogroups.com, "zl1ujg"
Thanks for the feedback. I've now added another document to the files area and this explores the modulation performance of the mk1 FT290R a little further.
It shows some basic modulation linearity checks on FM and SSB transmit modes.
Regards
Jeremy
G0HZU|
429|426|2011-11-15 15:14:10|Mansueto Grech|Re: FT290R mk1 RF tests|
Hi Jeremy,
Well done indeed. Very nice and informative.
Tahnks
Mans. 9H1GB
|
430|430|2011-11-15 20:10:38|Jim|replacment relays for the 290 mk1|
Hi,
Does anyone know where there is a supply of Fujitsu relays for the ft290 mk1, the relay in question is RL2001 on the main chassis.
The part number is M1190001 and the description is FBR211AD009M I have found that this relay is now discontinued by the manufacturers Fujitsu.
If none are available does anyon have a suggestion as to which relay could be used as a replacement.
thanks in anticapation jim G1ASN
|
431|431|2011-11-16 16:03:45|colin|Foil view of PCB|
Does anybody have a foil view of the main PCB around Q1014, Q1015 and Q1016? I am trying to find faults in that region and it is hard to locate compeonents on the solder side of the PCB!
Thanks
Colin - G8FRA/M5FRA
|
432|431|2011-11-17 19:30:06|colin|Re: Foil view of PCB|
Forget my last message I found what I needed in the files section. I replaced Q1014 as my tester showed it had an hfe of 2, used a BC847. Also replaced one of the diodes I crunched when changing a cap used an OA91. When I got everything back to normal the fault was still there. Tried a 47K across b-e but in the end used a 56k. S meter now near zero and full power out. Audio out sounds a bit quiet when receiving the local repeater. Maybe more caps need changing...
Colin - M5FRA
|
433|433|2011-11-17 19:30:17|colin|More on the AGC/ALC fault|
I got the radio working again by replacing Q1014 as my tester showed it had an hfe of 2 - used a BC847. Also replaced the diode I crunched - used an OA91. When I got everything back to 'normal' the fault was still there so put a 47K across b-e. That got it working but the S meter does not register any RX signal strength and I cannot set it up using the alingment procedure in the manual. There are also some other issues with the TX O/P, it is down slightly on what it was.
Overall I think the 47k resistor is not a fix for this problem but a bodge that gets the radios working again. If I had the patience and foil side layouts then I might continue looking around Q1014, 1015 and 1016 especially at R66 and R67 and Q1015. As it is I am inclined to ebay the set and get what I can for a partly working radio. Life is too short and there are lots of other more interesting projects and better IFs for 3cm!
Colin - G8FRA/M5FRA
|
434|433|2011-11-18 06:21:20|zl1ujg|Re: More on the AGC/ALC fault|
Hi,
I have just put the 47k in my old FT290 Mk1 which had showed the problem. Yes it had apparently fixed the slow AGC startup. And the S- meter is really mean.
It is interesting that even with replacing Q1014 it showed the issue
I had a quick look at the schematic and wonder whether there is a path for leakage to the base of the Q1014 AGC transistor.
Putting the 47k there will reduce the sensitivity of the circuit to input currents, so the AGC and ALC may not work efficiently. (Better than being locked up (or down) though.
It just needs some way of decreasing the threshold again. Have larger values of resistance been tried?
Its possible that humidity or moisture in the flux/ PCB is an issue with the Mkl's over time.
Without the 47k has anyone measured the base-emitter volts of the Q1014 transistor?
ZL1UJG
|
435|433|2011-11-18 10:29:13|GM8BJF|Re: More on the AGC/ALC fault|
Thats a shame. Sounds as if the radio has multiple faults.
73s
Brian
|
436|433|2011-11-18 11:17:39|M5FRA - Colin|Re: More on the AGC/ALC fault|
Brain, it is annoying. I found a broken resistor on a part of the board
that I had not touched, replacing that restored full audio O/P. All
that is left now is the S meter and I guess anybody can live with that.
What gets to me is that the 47k is a bodge, the real fault is still
there. As I said I have other projects waiting and I just do not think
it is worth spending a lot of time poking around with no clear
direction. The SDR radio awaits as does learning how to use the VNWR!
Colin - G8FRA/M5FRA
www.m5fra.org.uk
------ Original Message ------
From: "GM8BJF" <
brian.flynn@... To:
electrichandbag@yahoogroups.com Sent: 17/11/2011 22:06:11
Subject: [electrichandbag] Re: More on the AGC/ALC fault
|
437|437|2011-11-19 06:26:18|zl1ujg|AGC/ALC|
Hi,
Interesting... The TX on SSB is not there or very low, FM appears to be ok
Checked the RX sensitivity, and it seems to hear -120 dBm solidly on all modes. (It also sounds like AGC is very mean or has a very high threshold.)
Since I didnt have C rechargable batteries, I decided to put two 6V 1.3 Ah SLA batteries in the compartment. Put a 750mA polyswitch in series (RXE075), so prevents any problems. (The 2 SLA batteries are about 30% dearer than just two C type batteries, so its quite a price saving)
Two 15 ohms in parallel across the charger diode, lets it charge ok via 13.8v PSU. (looks a little like the Elecraft K2 setup)
Also saw a posting in the files section about the TX SSB response.
Very nice work.
Kevin
ZL1UJG
|
438|437|2011-11-19 07:17:33|zl1ujg|Re: AGC/ALC|
Hi,
I also tried CW, and full output...?
So I suspect C86 (and possibly C87 as well) is probably leaky.
It still doesnt explain why the 47k works on Q1014 b-e unless the leaky electrolyte has turned on Q1014 slightly.
Cleaning the PCB (top and bottom) after removal of the capacitors is necessary I think...
Kevin
|
439|437|2011-11-23 11:57:01|zl1ujg|Re: AGC/ALC|
Hi,
I hadnt bothered to check deviation on FM, and found out there wasnt any either, when using the YM-47 microphone. I tried a YM-49 microphone from the FT790 Mk1, and deviation and SSB looked good. I could tap the YM-47 dynamic insert and about 5% of the time it worked.
I might have some bits to convert it into a electret mic, as the molding allows that. (Getting the right dynamic insert could be a little tricky otherwise) The mic cable looks to have a spare wire for the DC feed, but not for a speaker...like on the YM49
Kevin
ZL1UJG
|
440|440|2011-11-27 18:55:21|Wayne|FT-690R Carrier Balance|
I'm trying to perform an alignment on an FT-690R. I'm having a problem with setting the Carrier Balance. I can find the null point using VR1001, and while this reduces the carrier somewhat, there is still a significant carrier present on a monitoring receiver. Where should I look now to fix this problem?
Thanks
Wayne.
|
441|441|2011-11-27 20:42:12|steve.w.harris@btinternet.com|botched AGC repair or second fault?|
firstly thanks to all posters for the advice that is here, using it i have succesfully fixed the TX fault on my FT290 mk1 and attempted the AGC 47k resistor fix. now the set works on TX all modes with a reported good audio and RX on SSB & CW works well but on FM the busy light is on all the time, squelch has no effect and altough the s-meter seems to correctly show a signal there is no audio out from the speaker. there a background hiss.
the question is, have i botched the agc repair or could there a second fault? joints look good and the resistor is in the correct place.
Steve G7BCE
|
442|441|2011-11-27 21:58:14|Mansueto Grech|Re: botched AGC repair or second fault?|
Hi Steve,
Don't mean to be a joy killer, but to ensure you really cud the problem,leave the unit unpowered for a few day and then power it up again and if it works then you've really cured it. I am telling you his because I have yelled many times Ulrika and ended back to square one.
Anyway good luck and let us know the outcome please.\7's
Mans. 9H1GB
|
443|440|2011-11-28 13:52:29|g3vvt@aol.com|Re: FT-690R Carrier Balance|
Hi Wayne,
Looking at the diagram for the FT-290R which should be basically similar, VR1001 on the MC1496P balanced modulator Q11012 does the carrier balance which is probably what you are adjusting.
Going back to radio basics the other item that is involved in the process is where the carrier is situated on the SSB IF filter response. The carrier is usually placed so that from memory with the lower edge of the IF passband (-6dB point) at 300Hz you would expect about -20dB attenuation due to the filter action at the carrier frequency (and be able to pass up to 2.7kHz at the upper end with a 2.4kHz BW filter). If the carrier placing is offset towards the filter passband the carrier null will be reduced and create difficulties as you describe. A similar effect could be due to problems with the MC1469P + associated components or the SSB IF filter being defective or even audio pickup from the microphone TX audio stages upsetting the result.
Suggest you first try adjusting the SSB CARRIER POINT ADJUSTMENT according to the Instruction Manual and then the CARRIER BALANCE ADJUSTMENT to see if improvement is made before going deeper into the problem.
You can use an alternative method of checking out how things are working which I did when building the Elecraft K2 from a kit and setting up the various parameters. With this the Spectrogram software was used with a PC and sound card to get the IF response and carrier setting points. To enable this the RX antenna input was driven with a noise generator you can build from one of the Elecraft Mini Module, N Gen kits:
www.elecraft.com/ . The software was free or shareware up to V5.17 which can possibly be still obtained from various sources. With this you see the IF response on the PC screen which was a valuable aid when starting from scratch.
Regards,
Bob, G3VVT
|
444|433|2011-12-03 14:23:50|colin|Re: More on the AGC/ALC fault|
I got the radio out to test a couple of days ago and it worked first time, no sign of the 290 fault. In the end I replaced about 12 electrolytics, a transistor and did the PW mod. All looks OK now except the S meter does not work which is not a real problem as it was useless before. I was going to use the radio as a 2m IF for 10Ghz but my health is not as good as it was and humping around a lot of gear and batteries for 10Ghz /P is not really sensible so the radio is on ebay.
Colin G8FRA/M5FRA
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445|440|2011-12-03 22:56:09|Wayne|Re: FT-690R Carrier Balance|
Thanks Bob.
You were spot on. The ssb carrier point needed alignment. Works well now.
Wayne.
|
446|446|2011-12-04 15:35:34|electrichandbag-owner@yahoogroups.com|Message from Group Owner - Change to moderation|
All,
As of today, i have removed the need for moderation by the owner/moderators for all postings, including new members.
This is an experiment, based on the fact that so far, no members of this group have posted messages that breach house rules, and I have not required to put a member back on moderation.
Please make sure you read and understand the group rules. If in doubt please ask. Anyone posting against the rules, flaming, spamming etc etc will be put back on moderation and may be banned.
Removing the moderation reduces the amount of admin required, but it also requires trust.
Lets keep this group the polite and curteous exchange that it has always been
Regards
Martin G7MRV
Group Owner
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447|447|2011-12-05 00:48:05|g7vhj|Newbie with display/freq problems. 290 mk1|
Hi All,
Thanks for the fantastic group i have gleaned much information already.
I hope someone can help with a problem i have with a mk1 290.
The display is off frequency with the radio, I.E if i want to put out a call on 145:500 the i need the radio to display 145:525 to be on the right frequency.
The radio display is 25KHz off on all modes and whatever frequncy i try.
The Manual suggests that it is the 18MHz x-tal at fault but after changing this i am convinced there is something i am missing.
Is there a variable cap/res that allows the display to be altered to the same freq as the pll?
Many thanks Pete de G7VHJ
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448|447|2011-12-05 01:16:58|Gordon JC Pearce|Re: Newbie with display/freq problems. 290 mk1|
On Sun, 04 Dec 2011 22:17:55 -0000
"g7vhj" <
g7vhj@... Have you gone through the alignment procedure? I'd take a look at the VCO and ref oscillator sections of that.
The display shows you what the PLL is programmed for. If the reference oscillator or any of the local oscillators are out, the transmit and receive frequencies will be out.
--
Gordon JC Pearce MM0YEQ <
gordonjcp@...|
449|449|2011-12-05 14:20:01|Jim|Blown PA replacement|
Has anyone had to relpace the pa chip in a 290 mk1 as I have a couple of fixer ups all with blown pa's.
My problem is knowing what other parts I need to replace to bring everything back to normal.
I do have some pa chips on order.
I also have a 790 mk1 with the same problem has anyone ever relpaced the chips in both types of radio
regards g1asn
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450|447|2011-12-06 00:08:14|g7vhj|Re: Newbie with display/freq problems. 290 mk1|
--- In
electrichandbag@yahoogroups.com, Gordon JC Pearce
I must admit i haven't gone through the alignment yet as i was hoping that the fault might have been easier than that,
O.K i guess its time to fire up the sig gen and scope and start probing the board.
regards Pete de G7VHJ|
451|449|2011-12-06 08:25:59|Mansueto Grech|Re: Blown PA replacement|
Hi Jim,
I have replaced a few. Usually just replace the PA which by the way is a transistor not one of these hybrid chips. If memory serves me well I believe its a 2SC1947. Again I'd memory serves me well
Please also take note that if the unit has been connected, supply wise, wrongly, check the reverse diode too. Apart from that I have never encountered another faulty components.
Hope I was of some help and please email me if you need other clarifications.
73's and good luck
Mans. 9H1GB
|
453|453|2011-12-14 10:32:16|zl1ujg|FL-2010 Linear(?) for FT290Mk1|
Hi,
Decided to check the operation of my FL2010 amplifier.
The standing current was a little low.
The manual said 150mA PA collector current. And it was 60 mA. Adjusted that up. With the FT290 driving it at 2.5 w, it maxed out at about 12w at 13.5v.
The manual says a nominal 10W.
I looked at the base DC volts on the decoupled side of the base choke.
Activated, but no RF drive (SSB but not talking), and the volts was 0.7v DC.
With FM drive, similar power expected with SSB PEP, I measured -0.3 volts, while talking to a workmate. I thought I had the meter leads around the wrong way. I was about to change them, but realised they were correct.
I have seen this bias collapse before on 2M PA's and transceivers and most require at least simple transistor and two diode bias.
The Kenwood TS700 suffered from this issue, but it had a 22 ohm in series with the base bias. A simple reconfiguration improved the linearity considerably
The FL2010 PA device is a 2SC2094, which is about 15W max out in a T31-E package.
I will investigate using a 2SC1946A device which has 30+ watts capability with the same package, and is sometimes used in budget 2M PA's of around 30W output.
Kevin
|
454|453|2011-12-14 16:47:10|gi0gdp|Re: FL-2010 Linear(?) for FT290Mk1|
Hi Kevin,
To be honest any PA above a few watts should be biased with a temp compensated emitter follower,
regards
Geoff
|
455|453|2011-12-15 06:40:08|zl1ujg|Re: FL-2010 Linear(?) for FT290Mk1|
Hi,
Unfortunately the single diode biaing is all too common, not only with homemade amplifiers, but even commercial "amateur" amplifiers having the diode biasing, even up to reasonable RF power of 50 to 100W.
Many years ago, I modified a MMT144-28 10 watt transverter PA from single diode biasing (with the base DC volts already collapsing) to two diode and emitter follower design.
The results when measuring TX 2-tone IMD were dramatic. The 3rd order was about -32 wrt each tone, and higher orders fell off 10 to 15 dB/ each order from memory.
The original design, I think had -25 dB 3rd order and the higher orders fell off very slowly.
I guess there are still lots of bipolar "linear" :P amplifiers in circulation, and will be for many years to come. FET PAs have made some inroads.
Kevin
ZL1UJG
|
456|456|2011-12-25 21:30:09|signalman341|The good old FT290R MK1 debate continues|
Hi,
I have just joined the group today and I have read with interest the email trail in respect of the above, it would seem that after all these years thesre must be a common failing that stil eludes us all.
I have just got my other 290 out of the loft , this rig has the above classic fault which I experienced some years ago and placed some comments on eham.
I tried the damping resistor dodgw today and that did'nt work at all, I was pleased that Hanzinzl had placed some pics on this site to confirm that I had correctly located the necessary pads to solder the resistor to.
I have tried several values of resistor from 47K up to 1M and the fault is still there, I do agree with many of the commnebts that this dodge, when it does work is only masking the real problem and indeed could impact on the 290 performance.
I then removed the resistor doge completely, the fault still being apparent and tried out what I did back in 2009.
Like others in this group I found that warming the rig gently with a hair drier in the vicinity of Q1014 seems to clear the problem in the short term, in my case for 10's of seconds, then the fault is back.
Originally in 2009 I could warm the set up in a simialr manner and the fault would clear for quite an amount of time, I could then induce it to return by using freezer spray.
It would seem therefore that the problem lies with one of the semiconductors, which one is question, I am tempted to replace Q1014 with one from a completely dead 290 I bought for spares.
Hopefully I might be able to track this one down as I would like to fix my faulty 290 and also a friend of mine who is experiencing the same.
I'm open to comments, it's nice to have a group like this to bounce ideas off.
Merry Christmas and Great new Year to you all.
Steve
|
457|456|2011-12-30 12:57:08|peter Laughton|Re: The good old FT290R MK1 debate continues|
Its leakage in the board-remove the transistor and swing it on its legs only-clear of the board. Probably work ok now. My 290 is 32 years old and apart from some crook pin diodes 18 months old, nothing done to it. Its switched on 24/7 in the ute. perhaps thats got something to do with it. Also, mine uses ELNA brand caps, a good jap brand-not chinese.
regards
Peter
From: signalman341 Hi,
I have just joined the group today and I have read with interest the email trail in respect of the above, it would seem that after all these years thesre must be a common failing that stil eludes us all.
I have just got my other 290 out of the loft , this rig has the above classic fault which I experienced some years ago and placed some comments on eham.
I tried the damping resistor dodgw today and that did'nt work at all, I was pleased that Hanzinzl had placed some pics on this site to confirm that I had correctly located the necessary pads to solder the resistor to.
I have tried several values of resistor from 47K up to 1M and the fault is still there, I do agree with many of the commnebts that this dodge, when it does work is only masking the real problem and indeed could impact on the 290 performance.
I then removed the resistor doge completely, the fault still being apparent and tried out what I did back in 2009.
Like others in this group I found that warming the rig gently with a hair drier in the vicinity of Q1014 seems to clear the problem in the short term, in my case for 10's of seconds, then the fault is back.
Originally in 2009 I could warm the set up in a simialr manner and the fault would clear for quite an amount of time, I could then induce it to return by using freezer spray.
It would seem therefore that the problem lies with one of the semiconductors, which one is question, I am tempted to replace Q1014 with one from a completely dead 290 I bought for spares.
Hopefully I might be able to track this one down as I would like to fix my faulty 290 and also a friend of mine who is experiencing the same.
I'm open to comments, it's nice to have a group like this to bounce ideas off.
Merry Christmas and Great new Year to you all.
Steve
|
458|456|2011-12-30 13:39:27|scj9874@aol.com|Re: The good old FT290R MK1 debate continues|
Hi Peter,
thanks for getting back to me, I actually have the 290 on the bench at the moment. I have found that heating the area around Q1014 up gently and the fault will go temporarily. I have taken the voltage readings during fault/no fault conditions and the base of Q1014 does vary quite considerably from -5.7v (fault) to 1.82v (no fault) both measured with respect to chassis.
You mention leakage in the board, are we assuming that there is some contaminent that has caused the electrical leakage.
Steve
In a message dated 30/12/2011 10:57:09 GMT Standard Time, peterlaughton@... writes:
|
459|456|2011-12-31 23:50:20|peter Laughton|Re: The good old FT290R MK1 debate continues|
Whats your pcb board made of ? The early ones were a type of phelonic bakelite which would be hydroscopic. Remove the suspect transistor, cut the board away from around it, then redo the tracks with bits of wire and just hang the trans in mid air by its leads. Use a bit of silicon to support it.
The heating dries the board temporirily and allow correct operation. But as the moisture is already in the whole board, it migrates out to rewet the crook area.
My 290 has a fibreglass board, but the components are not silk screened on it, so I think mine is an early production type.
regards
Peter laughton VK2XAN
From: "scj9874@..."
Hi Peter,
thanks for getting back to me, I actually have the 290 on the bench at the moment. I have found that heating the area around Q1014 up gently and the fault will go temporarily. I have taken the voltage readings during fault/no fault conditions and the base of Q1014 does vary quite considerably from -5.7v (fault) to 1.82v (no fault) both measured with respect to chassis.
You mention leakage in the board, are we assuming that there is some contaminent that has caused the electrical leakage.
Steve
In a message dated 30/12/2011 10:57:09 GMT Standard Time, peterlaughton@... writes:
|
460|456|2012-01-02 00:41:17|Mansueto Grech|Re: The good old FT290R MK1 debate continues|
Hi Steve,
I too am suffering from the same problem On both mine it is more pronounce during the cold humid winter days. I too am of the opinion that the PCB used in that rig id the main culprit. I also have been given a Somerkamp FT290R " supposedly built in Germany" and in this case it has been unused for a good 15 years yet even though the the top and bottom covers , chassis and the SO239 are corroded to an unusable extend yest I powered it up slowly and believe it or not the unit work fine first go.
Steve I gather that you have a faulty FT290 which you are cannibalising for spares, I wish to ask a favour if you can part with the chassis and SO239, better still top and bottom covers, in order to restore this still fully functioning Somerkamp FT290R, I would be interested to purchase these items.
If you can part with these item please contact me off reflector.
Thank you in advance
73's and Happy new year to All
Mans.9H1GB
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461|430|2012-01-09 19:49:20|iv3ddm|Re: replacment relays for the 290 mk1|
Hi Jim.
Sorry for delay to reply but I have just join this group.
I do not know where you can find the relay, but in the next link, in the second part, you can find a modification to replace the relay with an electronic switch:
http://www.ko4bb.com/Manuals/Yaesu/Yaesu_-_FT-290R/FT290R_mod_it.pdf In my FT290R, in the past I put a relay of the same size but with different pin, doing the spinning.
I think that soon I'll try the circuit I have indicated to You.
73 Giorgio iv3ddm
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463|463|2012-02-06 23:26:29|shaunm6spw|SSB drive,lack of|
Hi guys,i have a mint FT-290R2 that i recently acquired,it is doing 2.8watts into a dummy load on FM yet on SSB it only peaks at 0.5w (half a watt) when i speak into the hand mike in a normal voice,yet if i whistle it goes upto 2.5 watts,what im here to ask is there an internal adjustment inside that i can do to improve the SSB drive?
thanks in advance,Shaun.
|
464|463|2012-02-07 00:22:33|Geoff Blake|Re: SSB drive,lack of|
Thie power levels you speak of are what I would expect. Whereas FM is
a constant power mode and 3W (nominal) is right for the FT290R2, on
SSB the power is exactly related to the input - or should be!
A whistle is quite a loud tone and can easily drive the 290 to full
output and beyond. However the human voice, when speaking, has a quite
low power density - connect a microphone to an oscilloscope and look
at the relative waveforms. Typically, the average power of the human
voice is between 20% and 30% of the peak, when talking continuously
(no pauses).
If you increase the microphone gain to increase the average power, the
peaks will (want to) increase too. The output stage will not handle
this power - if it did they would sell it as a 10W or maybe 20W rig! -
and it will distort the transmitted signal. This distortion manifests
itself as splatter - a distorted version of your signal perhaps 10kHz
wide, maybe more - and it will make you unpopular with other local
operators.
To properly measure the output of a SSB transmitter, you need a peak
power meter, which does what it says. Unfortunately there are several
devices on the market which call themselves a peak power meter, but
few read a true peak power.
As I said at the start, and depending on the characteristics of your
voice, I would expect to see around 0.5W average power output, exactly
as you are getting.
73 Geoff
|
465|463|2012-02-07 01:48:37|shaunm6spw|Re: SSB drive,lack of|
Hi Geoff,aslog as this is normal for this transceiver then fine,i may have to get the matching 25w linear for this radio then maybe this would enable upto 10w output on SSB,im really chuffed with the 290R2 as its a real nice radio & audio reports so far on FM have been excellent,thanks for your input,Shaun :O)
|
466|463|2012-02-07 03:20:28|Geoff Blake|Re: SSB drive,lack of|
Hi Shaun,
I am afraid that you may be missing the point. Your radio may well be
giving the right power out, it is just that your meter is not reading
the signal peaks. The 25W linear, if driven to its full output, will
produce a peak output of 25 watts, which will be 2-3 S-points higher
and outside your licence limit, although you will have to take feeder
loss into account.
I would not go looking for a FL2025, they are not that common and I
would expect you will have to pay more than it is really worth.
Instead, I would save my pennies and perhaps get a FT817 which you may
know covers 160 m to 70 cm at 5W or so.
I use my FT290R2 and my FT790R2 as microwave transverter drivers and
run them both in the low power mode.
Whereabouts are you, within radio range of Chelmsford?
73 Geoff
|
468|463|2012-02-07 13:58:55|shaunm6spw|Re: SSB drive,lack of|
Hi Geoff,well im using a Revex W520 meter,its the same as the Welz's & it reads PEP,it reads PEP good enough on my HF sets,so i don't see how it should be any different on the 290R2??
Also the meter on the actual radio only makes it to S1 on the scale when speaking on SSB while on FM it reaches halfway into the red.
As for the linear no im not going out of my way to find one & yes i know they are quite rare now,my fri & end has a microwave modules 25w linear that came with his mk1 290 and he has said i can use it as he don't use it anymore,so i may take him up on his offer,yep i will make sure its not doing anymore than it should do as per terms of my licence,i would'nt want to be like a lot of "G's /M0's" on HF using more than 400w with their big linears now would i ;O) ,
thanks for your help,Shaun :O)
|
469|463|2012-02-07 20:29:28|Geoff Blake|Re: SSB drive,lack of|
Hi Shaun,
I don't know the Revex product, however, unless it has an amplifier as
part of the peak reading circuitry I would doubt that it has a fast
enough attack time to read true peak power. The relative ability to
read PEP depends on the coupling factor on each band. The best way to
measure the PEP is to use an oscilloscope.
I would go along with the choice of the Microwave Modules amplifier,
they were well made and should last if not abused.
Regarding power, I know what you mean, and it is often those who
should know better who abuse the system. When I used to run valve
linears, my maximum output on 2 m was 350 W or so and about 150 W on
70 cm. Today I cannot much exceed 100 W on any band and I have
capability on most bands from 160 m to 3 cm.
73 Geoff
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470|463|2012-02-07 23:57:08|g0hzu|Re: SSB drive,lack of|
Hi Shaun
The Revex 520 is similar to my Welz SP220 power meter.
My Welz is pretty hopeless at measuring true PEP and also on the 2W scale the switchable PEP function doesn't actually do anything different. i.e. it doesn't even add any 'hold' capacitance. I've seen evidence to sugest that the Revex is just as bad.
On the higher ranges eg 20W and 200W it does at least attempt to try and capture 'some idea' of PEP by having a longer time constant after the detector when the PEP function is selected. But it's still pretty poor.
Also, these meters aren't very accurate up at VHF anyway. They are very good across the HF band for measuring CW signals.
The Yaesu YS60 is a very similar looking meter but it does boast an active PEP detector circuit (using opamps) as opposed to the crude and ineffective Welz and Revex that use a totally passive circuit.
So you need to find a better power meter that can indicate PEP.
Regards
Jeremy
G0HZU
|
471|463|2012-02-08 21:04:43|g3vvt@aol.com|Re: SSB drive,lack of|
Hi Shaun,
Most of the RF power meters that are said to display PEP do not and to this your Revex W520 is no exception. All that is done when you switch to PEP is that an electrolytic capacitor is placed across the meter that raises the averages of the voltage applied. With heavy compression it will seem like the meter is indicating PEP where in fact this is not really the case. Even some that have to be supplied with 12v may only use this for a lamp rather than supply a proper peak level indicator and hold circuit. Out of all the RF power meters available on the market very few actually indicate PEP.
However it is possible to modify RF power meters to indicate PEP with an add on circuit, though currently the only one that seems to be on the market presently is for the Bird 43 Thruline RF wattmeter.
In the past a small ready built PCB was available from a company in N Wales called Technical Software at £12 inclusive. Aged users of the BBC computer may remember this company as suppliers of RTTY/Slow Scan software and interfaces for the BBC computer. This unit went off the market a long time back, but there was an article by John Fielding, GW4NAH in Radio Communication magazine of January 1989 on P48 that also gave the circuit diagram which could help one to duplicate the unit. Sadly the callsign of GW3NAH nor that of the proprietor of Technical Software are any longer listed, so may be both SK? I purchase a few of these circuit boards when they were available and have one installed in a JRC ATU plus another in a old KW PEPMETER, PEP test set that has it's own two tone generator built in. Both seem to work very well though in the devices used are only suitable for HF use. Compared to a Weston Electronics PM-2000 HF PEP meter I have in the shack they seem to be reasonably comparable.
Have an old Heathkit HM-2102 VHF power meter that also does not read PEP, so thinking about building my own copy of the circuit on Veroboard as SSB is used here on both 2m and 4m. Nothing special about the components apart from maybe a 1uF 63V poly capacitor which is not normally found in the average junk box. Uses a 358 series dual op-amp and probably could be just as well the LM324 or similar. There is an error on the given circuit as two RF decoupling capacitors are missing compared to the original built PCB as supplied. I still have the original instruction sheets that came with the PCB in my document files.
Regards,
Bob, G3VVT
|
472|463|2012-02-09 14:47:44|shaunm6spw|Re: SSB drive,lack of|
Thanks for all your help guys,i did'nt expect miracles from the revex,but i now know they are not the best & the reasons for it,still can somebody please explain why the meter on the radio itself only goes upto an S1 on SSB in normal speech,then it goes into the red on FM,surely it should peak more than S1 on the meter on SSB???
and is there an internal adjustment to make it do better? thanks,Shaun :O)
|
473|463|2012-02-09 19:20:30|Geoff Blake|Re: SSB drive,lack of|
Hi Shaun,
The meter on the radio reads carrier level, thus on FM it reads full,
whereas on normal SSB speech it reads between 20 and 33%. I would
point out that the meter is only a "guessing-stick" and is in no way
accurate! The meter itself is probably linear to about 10% but that of
the driving circuitry is anybody's guess.
This topic comes up every month or three on the FT817 and FT897 yahoo
lists. It is often presaged with a post saying on (say) 100W, my
"super dooper" power meter only reads 95 W when the output is set to
100 W. Few people seem to realise that a professional in-line power
meter, like a Bird 43 or similar has a typical accuracy of +/- 10% of
FSD. To measure RF power to better than a few % needs cal. lab.
conditions and equipment. In my experience I would not trust a typical
amateur power meter to read better that +/- 20% on a good day.
73 Geoff
|
474|463|2012-02-10 13:18:07|gi0gdp|Re: SSB drive,lack of|
If this question comes up so often then perhaps the Foundation/Intermediate syllabus needs looking at?
Anyway the Revex meter wont read "PEP" on its low power setting.
On the other 2 setting ranges it attempts to measure PEP with said capacitor and reads low, often 60-70% of the expected value
If there aren't any IP issues with the previously mentioned pep pcb and circuit i think it would be a good idea if i was to scan it and put it into the files section so others can build it.
This will go some of the way to giving better readings on SSB,
regards
Geoff Pike
|
475|463|2012-02-10 14:43:48|Geoff Blake|Re: SSB drive,lack of|
To be fair, the vast majority of questioners were not UK Licencees...
73 Geoff
|
478|463|2012-02-12 02:17:58|Andrew Davis|Re: SSB drive,lack of|
Shaun,
For what it's worth I use a rule of thumb when watching a meter using ssb voice. If I have set a full scale power level using a tone, CW or FM mode, then I expect to see a typical SWR/power meter show about 1/3 of full scale reading when using voice and using the international standard test sound "aaaaaaaaaaaahhhhhhhhhhh". :)
This works because the meter shows the average power level, and the voice waveform is not constant, the level fluctuates continously. If the meter shows any more than full scale on voice, it usually indicates overdriving which usually results in splatter, ie interference to adjacent frequencies.
If you look at a meter calibrated in watts, 1/3 of the voltage reading corresponds to about 1/9 of the power reading. power is proportional to the square of voltage. Meters read voltage.
This echos the advice given earlier, that a low apparent reading is probably quite ok and does not indicate anything wrong with the transmitter. It was good advice.
As far as the power level that's safe with the FT290R on FM, I strongly suggest sticking with the manufacturer's settings. With transistors, you can have rated power for a long time, or higher than rated power for a short time, choose which you prefer.
73
From: shaunm6spw Hi Geoff,just done some tests using my ft-950 on the 100w setting into a dummy load & you are right mate,the Revex only reads about 70w PEP,so thats your point proven mate as far as im concerned,so i would guess my ft-290R2 is doing nearer 1w PEP on SSB rather than 0.5w as the Revex meter was telling me,was gonna ask,what is the
safe level for me to set the power output to on fm via the internal ALC VR? as i know about the s point to db factor,but what is the safest maximum power output the 2sc1971 transistor can be driven at?? as i have seen the spec for this transistor is 6w,so would it be safe to run it at 4-5w?? thanks a naive M6 ;O),regards,Shaun.
|
479|463|2012-02-12 04:36:45|Andrew Davis|Re: SSB drive,lack of|
Correction: in para 2 I wrote "any more than full scale" but I meant to write "any more than half of full scale".
From: Andrew Davis Shaun,
For what it's worth I use a rule of thumb when watching a meter using ssb voice. If I have set a full scale power level using a tone, CW or FM mode, then I expect to see a typical SWR/power meter show about 1/3 of full scale reading when using voice and using the international standard test sound "aaaaaaaaaaaahhhhhhhhhhh". :)
This works because the meter shows the average power level, and the voice waveform is not constant, the level fluctuates continously. If the meter shows any more than full scale on voice, it usually indicates overdriving which usually results in splatter, ie interference to adjacent frequencies.
If you look at a meter calibrated in watts, 1/3 of the voltage reading corresponds to about 1/9 of the power reading. power is proportional to the square of voltage. Meters read voltage.
This echos the advice given earlier, that a low apparent reading is probably quite ok and does not indicate anything wrong with the transmitter. It was good advice.
As far as the power level that's safe with the FT290R on FM, I strongly suggest sticking with the manufacturer's settings. With transistors, you can have rated power for a long time, or higher than rated power for a short time, choose which you prefer.
73
From: shaunm6spw Hi Geoff,just done some tests using my ft-950 on the 100w setting into a dummy load & you are right mate,the Revex only reads about 70w PEP,so thats your point proven mate as far as im concerned,so i would guess my ft-290R2 is doing nearer 1w PEP on SSB rather than 0.5w as the Revex meter was telling me,was gonna ask,what is the
safe level for me to set the power output to on fm via the internal ALC VR? as i know about the s point to db factor,but what is the safest maximum power output the 2sc1971 transistor can be driven at?? as i have seen the spec for this transistor is 6w,so would it be safe to run it at 4-5w?? thanks a naive M6 ;O),regards,Shaun.
|
480|463|2012-02-12 17:36:51|g3vvt@aol.com|Re: SSB drive,lack of|
Hi Shaun,
The power setting on the FT-290R can be whatever your heart's desire, but comes at a price!
Depends how good you are at sourcing new PA transistors and have the ability to change them. Maybe also have to reset the biasing to cope with any parameter changes of the new PA transistor that on an odd occasion may be needed.
Yaesu give instruction in the FT-290R manual on how to set the PA power output at 2.5W on FM using the ALC control for good reason and that is to ensure that the radio gives long and reliable service.
Have seen this idea pop up over the years with various low power portable radios where some individual believes they know better than the manufacturers. The last one was with the Yaesu FT-817 where understand this resulted in a rash of PA failures. If the manufacturers believed it was safe to run at a higher power you could safely bet that they would do it.
The instruction manual for the FT-290R (mk1) was really a gem as it has included all the instructions need for quite a number of parameter checks and adjustments together with the circuit diagrams that was not provided in later manuals from the FT-290 mk2 onwards.
Regards,
Bob, G3VVT
|
481|463|2012-02-13 00:16:55|Geoff Blake|Re: SSB drive,lack of|
Hi Shaun, group,
I would always observe the manufacturers design figures, i.e. 3 W. I
would keep to this level not because of the rating of the PA
transistor but the ratings of the PA circuitry as a whole. One big
limitation is the heat-sinking of the PA transistor and another is
VSWR protection. If you think about it, any reflected signal back
from the aerial/load appears in the PA transistor (normally there is
nowhere else for it to go) and adds to the dissipation. The designers
choose their numbers for good reason. If you overrun the PA you do it
at your own risk.
Back in the days of valve equipment there used to be two sets or
ratings CCS - continuous commercial service - and ICAS - intermittent
commercial and amateur service. However valves are much more tolerant
of short-term overload, transistors are just fast fuses. HF rigs like
the FT101, particularly those that run "TV sweep tubes" like the 6JS6
and the 6LQ6 run them at quite high levels, exceeding their design
ratings somewhat, especially as they are not designed for such usage.
It is OK (?) for SSB, where the mean power is perhaps 30% of the peak,
but on FM overrunning the PA is a valve/transistor killer.
Most digital signals are continuous signal modes and thus it is good
advice to run the radio at typically 30% of full output. Part of this
reduction in output power is to improve the signal quality, important
on most digital modes, but also to protect the PA stage. Of course,
modes like PSK31 etc. require much lower power.......
Finally, I would not consider you naive, you are learning and ask
advice, that is important. When I was first licenced (40 plus years
back) I had the advantage of having worked about 10 years in
electronics, much of that on transmitting kit. However, I still
learned to be cautious the hard way!! Also the only stupid question is
the unasked one!!!
Good luck & 73
Geoff
|
482|482|2012-02-15 02:04:07|chuckbland|Identifying the microphone|
I just had the pleasure of acquiring a 290R-II.
It has the "standard" mic with just the UP, DWN, FST buttons. The little plate on the back where the slider switch is, is gone.
I'm lookin' for docs on the mic and info about the switch.
Can anyone help?
Chuck
NA6BR
|
483|482|2012-02-15 15:33:48|g3vvt@aol.com|Re: Identifying the microphone|
Hi Chuck,
A long time since have last seen your email address, possibly from the days when building the Elecraft K2 in 2004 which still has an important place in my shack.
The service notes I have for the FT-290RII give no clue to the microphone internal wiring apart it was supplied with the usual signal lines, though with the 8 pin Foster plug. With the plate missing is even more difficult as could either be the correct MH-10EB or the similar type used on HF with the FT101 series which was the MH-1B8 as they are externally very similar.
With the correct microphone the function of the switch is LOCK with the OFF position to the left looking at it face on. This disables the UP, DOWN and FAST buttons. With the HF version this becomes a tone switch that changes the audio bandwidth quality, so the difference should be fairly obvious. For the YM-47 used in the FT-290R, the switch made contact with the PTT ground for the UP/DOWN buttons when enable ON.
Had to telephone an old friend of mine on one of our offshore islands who has the same radio to find the differences. If you need any further help can call him again to find if there is a diagram for the microphone in the FT290RII Instruction Manual. Presume the microphone could be fairly easily modified if it is the HF variant. Have a brand new MH-1B8 bought as a spare many years ago for reference.
Regards,
Bob, G3VVT
|
484|482|2012-02-15 21:07:21|chuckbland|Re: Identifying the microphone|
This must be a tone switch. There is a capacitor mounted on the back of the switch. I was guessing it had that kind of function. I'll search the model numbers and see what I come up with.
Thanks for the pointers.
Your recollection of the K2 link is correct. I was on that list for quite a while and only dropped because I wasn't reading it. My K2 works, so I didn't see the need to lurk the list.
Thanks again for your reply.
Chuck
|
485|482|2012-02-15 23:49:23|Jim|Re: Identifying the microphone|
hi chuck a local ham has the same radio bought as original
the plate on the back of his microphone is''MH10'' i hope this helps
regards g1asn
|
486|482|2012-02-16 20:04:44|Nick Tsakonas|Re: Identifying the microphone|
Hello Chuck,
I have an FT-290R-II which I bought used. It came with a microphone that does not have a FAST button, but my FT-890's mic has a FAST button.
see the images on these links, maybe you can recognize your microphone
this is the original FT-890 microphone
and this is the original FT-290RII microphone
also see the attached files for info on each one of them. They are excerpts from their manuals.
also, have keep this link handy...
Does this help you? If you want more info, tell me and I can check the specifics at home.
73, Nick, SV1DJG
From: chuckbland I just had the pleasure of acquiring a 290R-II.
It has the "standard" mic with just the UP, DWN, FST buttons. The little plate on the back where the slider switch is, is gone.
I'm lookin' for docs on the mic and info about the switch.
Can anyone help?
Chuck
NA6BR
|
487|482|2012-02-17 04:52:41|Jeff Herhold|Re: Identifying the microphone|
Hi Chuck!
I have one of these fine little rigs, and the microphone that came with it has the label on the front. It is a DTMF Microphone, model MH-15CB. The lock switch on the back works correctly, so I assume it is the original version.
Jeff WI7D
Wed Feb 15, 2012 1:49 pm (PST)
hi chuck a local ham has the same radio bought as original
the plate on the back of his microphone is''MH10'' i hope this helps
regards g1asn
--- In
electrichandbag@ yahoogroups. com, "chuckbland"
Hi Chuck and all the group.
Since I was trying to fix an SSB transmitting bug in a friend´s FT-290 R-II, I have a drawing of the MH-10FB, original mic on this radio.
It is hand drawn (sorry), but readable and I think would be helpful for somebody.
I´ve just uploaded it to the group´s Files folder.
Best 73 de EA1EBJ
(San)
|
489|2|2012-02-17 17:28:11|electrichandbag@yahoogroups.com|New file uploaded to electrichandbag |Hello,
This email message is a notification to let you know that
a file has been uploaded to the Files area of the electrichandbag
group.
File : /Sideband PEP.pdf
Uploaded by : gi0gdp <
gi0gdp@... Description : Radcom Article on PEP
You can access this file at the URL:
http://groups.yahoo.com/group/electrichandbag/files/Sideband%20PEP.pdf To learn more about file sharing for your group, please visit:
http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.html Regards,
gi0gdp <
gi0gdp@...|
490|490|2012-02-17 22:37:08|chuckbland|Problem with UP and DWN buttons|
Using the MH-10E (non-DTMF) mic, I'm finding the UP and DWN buttons aren't working.
According to schematics I've found, the mic is wired correctly internally and to the radio. When one of the buttons is pushed, it connects to the B+ line. All the switches are closing and nothing is happening.
If I disconnect the mic and short either the UP or DWN lead to ground, the radio does respond.
It is almost like the mic should be feeding GND instead of B+ to those switches.
I'm also wondering if I don't have the wrong mic.
Any opinions?
Chuck
NA6BR
|
493|493|2012-02-29 12:35:31|briandowner2003|NC-11 charger|
Hi,
I have just aquires a FT-290R mk 1 without a charger. I notice from the circuit the charger connects via a diode directly to the batteries therfore any charging circuitry would be in the NC-11.
I have looked at all the files online but cannot see any info on the internals of the NC-11, is it just a series resistor as most early chargers?
Many thanks
Brian G3ZQI
|
494|494|2012-02-29 14:01:48|Jon|Replacement Capacitor Pack for the FT 290R|
Could anyone tell me if there is a supplier of an "electrolytic capacitor replacement pack" for the FT 290 to replace all the 20+ year old capacitors that have started themselves to go into retirement! I have seen something similar for other rigs, but not managed to find anything for the "old faithful".
I am aware that there are a number of articles about fitting the replacements and curing the slow warm up problem, but could someone reference an article for me or just tell me where they exist in the archive.
Many thanks
|
495|493|2012-02-29 14:04:19|Hector Pascal|Re: NC-11 charger|
My NC11 charger failed so I dismantled it. To the best of my recollection, it was a simple centre tap transformer with 2 diodes and a capacitor on a pcb for full wave rectification. It may also have had a fuse (?). It probably relied on the poor regulation of the transformer to keep the charging current reasonably constant for NiCads. If I can find the parts again, I'll give you some further information.
David, VK6JT
|
496|493|2012-03-01 04:22:07|Hector Pascal|Re: NC-11 charger|
OK Brian, it was even simpler than I remembered!
Plate on charger says NC11-C NiCd Battery Charger
input   AC220/234 50/60 Hz 6VA
output DC 11.6V 150mA. plug tip is shown +ve, outer -ve
inside it:
Double insulated transformer type DE-122C
Single secondary winding. One secondary side goes directly to the outer of the "dc"plug.
The other secondary side goes via a 315mA type T 20mm fuse to the anode of a 1N4001 diode.
Cathode of the diode goes to tip of "dc" plug.
I am more and more convinced that this is only "constant" current if the voltage sags due to higher current draw in a poorly regulated transformer!
David, VK6JT
|
497|493|2012-03-01 09:29:47|briandowner2003|Re: NC-11 charger|
Hi David,
Many thanks for the excellent info, as I thought it the cheap type of the charger often seen in those days. As you say it probably relies on the transformer to provide the constant current (HI) and the user to disconnect after the prescribed 14 hours
I will probably build a better one to extend the life of the batteries.
73 de brian G3ZQI
|
498|494|2012-03-02 00:01:00|zaktherabbit|Re: Replacement Capacitor Pack for the FT 290R|
Im not aware of any such packs,
Hmmm, i'll take a look at what would be required
Martin
|
499|494|2012-03-02 00:57:41|Gordon JC Pearc e|Re: Replacement Capacitor Pack for the FT 290R|
On 01/03/12 22:00, zaktherabbit wrote:
More disc ceramics and fewer electrolytics than you'd suspect... ;-)
--
Gordon JC Pearce MM0YEQ
|
500|493|2012-03-02 19:44:58|geoffrey mendelson|Re: NC-11 charger|
On Mar 1, 2012, at 9:29 AM, briandowner2003 wrote:
That charger is based on the properties of Ni-Cad batteries. If you
dump a small amount of current into them, they will charge and it
would take days to cook them, if at all. High current chargers o the
era worked by pushing large currents into the battery packs, and
stopping when the circuit was broken, usually by a temperature sensor.
Usually it works, but I have many NiCad battery packs that were
"cooked"by that method.
Modern chargers use a more sophisticated method, by monitoring the
voltage of the cells.
This is absolutely required for NiMH cells.
I have the FT-290 Mark II, and I replaced the the C NiCads that were
in it with 2500mah NiMH slow discharge AA batteries in plastic sleeves
to make them fit. The positive tip of the AA batteries is too short to
work in the case, so I had to add washers to make contact.
I charge them in the pack with a NiMH battery charger I got for $15
off of eBay. It senses how many cells and adjust the voltage and
current and shuts off when they are full, before they begin to heat up.
I probably could get C NiMH batteries, but they are not available
except as AA batteries in C size cases, at C sized prices, and buying
the off of eBay involves expensive postage as they are relatively heavy.
Geoff.
--
Geoffrey S. Mendelson, N3OWJ/4X1GM
My high blood pressure medicine reduces my midichlorian count. :-(
|
501|493|2012-03-03 00:27:51|briandowner2003|Re: NC-11 charger|
Hi Geoff,
I managed to get 8 x 3000mAh batteries of eBay for $20, I wonder what they will be like. I will have a look for a charger similar to the one you mention but if nothing comes up I will probably use one of the Microchip Max charge controllers and build one myself, there maybe some room to fit it in the 290
73 de Brian G3ZQI
|
502|502|2012-03-11 08:52:49|briandowner2003|FT-290 R1 Audio stage Oscillating|
Hi everyone,
I am in the process of repairing an old R1 that has a problem with the audio stage. On turn on all appears OK, normal noise from the speaker, volume control works ok and the squelch is ok but then it start to whistle like its going off tune and the audio starts to get more gravely untill there is just very heavy spikey audio.
I have monitored the input to the chip with another amplifier when this occurs and all is ok. I suspect the uPc575C2 audio chip is going into self oscillation.
Has anyone had this before?
How do you cure it?
I have changed the chip to no effect
Many thanks
Brian G3ZQI
|
503|502|2012-03-12 00:31:59|dbztuzujdhgtrjzthxh|Re: FT-290 R1 Audio stage Oscillating|
Hi Brian,
the most common problem with FTx90's is the electrlytic caps - particualy around the audio amp area. Typicaly they show sign of corosion around the pins (but not always). I've replaced some 22uF that look fine, but measure 5uF when removed.
73
ian
|
504|504|2012-03-31 12:28:48|briandowner2003|CTCSS Board|
Hi,
I was wondering if anyone had a CTCSS board for an R2 and wanted to part with it
Good price paid + P&P
73
Brian G3ZQI
|
505|505|2012-04-06 18:17:31|PETER B|ctcss|
Is it possible to use an external ctcss unit, for instance, connected to the ptt line in the mike. I have three Ft 290's and a few Ic 2e clones.
It seems a shame not to be able to use them, via the repeaters.
I am not physically or electronically competant to install one internally.
73. PETER G0HPH
|
506|505|2012-04-07 08:06:23|Mansueto Grech|Re: ctcss|
Hi Peter,
Yes it is possible to use an external ctcss unit, although it is suggested to inject the signal after any pre emphases the rig might have.
Check this site.
http://www.spikey-mike.com/radio/ctcss.html
Hope I was of some help
73's and good luck
Mans 9H1GB
|
507|505|2012-04-07 16:36:57|PETER BROOKES|Re: ctcss|
Thanks Mans
I've looked at the site you linked me to, "Spikey Mikey," and it seems OK
I will give it a try. Fingers crossed.
Thanks again.
73,
Peter. G0 HPH
|
508|505|2012-04-07 22:31:34|Mansueto Grech|Re: ctcss|
Hi Peter,
All noted. If you need any help please do not hesitate to ask.
73's
good luck
Mans. 9H1GB
|
509|509|2012-06-30 18:04:06|dbztuzujdhgtrjzthxh|Failure to boot properly|
Hi All,
I recently acquired (another) FT290 Mk1.
Generally it seems in excellent condition with no evidence of any work inside.
The (I suspect) original NiCds had leaked somewhat allowing electrolyte into the contacts of the battery carriers resulting in high resistance (0.5~20 Ohms) between several rivets and the springs. This showed up as erratic behaviour where the cells would show charge, but the set wouldn't run reliably. This was fixed by replacing the two carriers.
The final (for now) problem has been that on occasion, the set would start-up and only provide coverage from 144.000 to 145.975. That might seem ok for some, but here in VK we like a couple more MHz.
I repeatedly followed the reset procedure without any change until I altered one parameter - the display light.
It seems on this set, some of the caps are deteriorating near the CPU and the extra load provided by the lamp is enough to confuse the CPU on boot.
A reset with the lamp off followed by leaving the memory backup turned on seems to have sorted out this "issue".
At some stage I'll replace the electrolytics on the CPU board to make sure, but so far it's running well again.
73
ian
|
510|509|2012-06-30 18:14:32|Gordon JC Pearce|Re: Failure to boot properly|
On 27/06/12 15:40, dbztuzujdhgtrjzthxh wrote:
Any particular reason for suspecting the electrolytics on the CPU board
or is this that mythical "ZOMG ELECTROLYTICS MUST REPLACE THEM" thing
that people do?
If it's working, leave it alone ;-)
--
Gordonjcp MM0YEQ
|
511|511|2012-06-30 19:38:42|Mansueto Grech|FT290r case|
Hi all,
A fried donated his old Somerkamp FT290R which works perfectly well but the chassis top and bottom covers are so corroded that you could practically see through it.
Does anyone happen to have an FT290r which is beyond economical repair who might consider parting with.
BTW Somerkamp and Harsh use the same chassis just the front sticker at is different.
Thanks in advance
Mans. 9H1GB
|
512|511|2012-06-30 20:55:21|briandowner2003|Re: FT290r case|
There is a top &bottom on EBay in the uk reasonable price
290723371568
Not mine, don't know if they fith the one you have
|
513|509|2012-06-30 21:12:17|Geoff Blake|Re: Failure to boot properly|
On 30 June 2012 17:14, Gordon JC Pearce <
gordon@... Gordon, Group,
From a professional POV, gained from working on and repairing
electronic equipment for nearly 50 years now, I can say that after
perhaps 20 years of life, most, if not all electronic equipment,
perhaps with the exception of some military spec. equipment, some will
show benefit from a general replacement sweep of all electrolytic
capacitors.
This is not an opinion formed by a few overheard comments, nor am I in
the pay of component suppliers! It is a professional opinion formed
from the measurable improvement in the performance of calibrated
equipment when such measures are taken.
Of course, the quality of components used, hence the comment regarding
military kit above. Experienced engineers will recognise "replace on
sight" types as well as those of better quality. However there are
also "forgeries" in the capacitor world, for example, there has been a
type of capacitor, widely used on PC motherboards which has been
widely copied, but has quite a short service life - the electrolyte
was not quite right. At least two major PC manufacturers fell foul of
this one.
Finally, as a closing note, this must be considered in terms of cost.
Certainly, employing a professional service to replace all the
electrolytics in a FT290 will almost certainly cost more that it is
worth, that is one of the reasons why I now own/use a FT817, but in
the case of something which is irreplaceable it is often the only
option.
I am minded of a certain piece of measurement equipment, used by
coil/transformer manufacturers to measure the inductance and "Q" of
high current inductors. These were manufactured in the 1970's and
obviously were no longer available - nor was there a functional
equivalent available.
I was asked by a client to see if we could refurbish one, almost
regardless of cost. We did, mainly by replacing all the electrolytic
capacitors, and found that it performed bang on spec., whereas before
surgery it was marginal in performance (measurement accuracy) at best.
When we returned the instrument to the client, I had a phone call from
the engineering director thanking us for our efforts and wishing to
schedule the other three of those instruments for refurbishment. In
addition we had several others sent in from other companies, companies
I never knew existed.
In short then, the "ZOMG ELECTROLYTICS MUST REPLACE THEM" old wives
tale may be just that, but like many old wives tales, it is based on
more that a modicum of truth.
73 Geoff
--
#################################################
Geoff Blake, Â G8GNZ Â Â JO01fq: Â Chelmsford, Â Essex, Â UK
<
geoff@... Using Linux: Ubuntu 11.04 on Intel or Debian on UltraSparc
and even on the NAS. Â Â Avoiding Micro$oft like the plague.
#################################################
|
514|509|2012-06-30 23:05:17|Gordon JC Pearce|Re: Failure to boot properly|
On 30/06/12 20:12, Geoff Blake wrote:
Yup. Where I'm coming from with that is that crappy switched-mode power
supplies notwithstanding (those bloody Amstrad SRD1000s!) I've replaced
about half a dozen genuinely faulty electrolytics in all the time I've
been fiddling about with electronics, and I replace about that many disc
ceramics or MLCC surface-mount caps a week.
I've also had to scrap some nice old analogue synths that have been
brought to me after someone has decided "oh it's faulty it must be a
capacitor" and set about it...
--
Gordonjcp MM0YEQ
|
515|511|2012-06-30 23:31:53|Mansueto Grech|Re: FT290r case|
Hi Brian,
Thanks for the info.I'll have a look
Thanks again
Mans.9H1GB
|
516|509|2012-06-30 23:50:30|Geoff Blake|Re: Failure to boot properly|
On 30 June 2012 22:04, Gordon JC Pearce <
gordon@... Hi Gordon,
I am not quite sure that I understand what you are saying. As I read
it, with the exception of SMPSU's, you have only replaced a dozen or
so electrolytics. If so, either you have been very lucky, or most of
the equipment that you have worked on used (canned) paper capacitors -
now those were the days.....
I think that you have to consider the failure modes of various
components. Resistors changing value by say 10% manifest themselves in
several ways, by shifting operating points of active components etc.
whereas a 10% shift in a capacitor is unlikely to be noticed.
Similarly, an increase in ESR of a capacitor is not likely to be
obvious outside a SMPSU. However, such changes (10% or increased ESR)
can make operation marginal, especially if repeated over several
components.
Geoff
--
#################################################
Geoff Blake, Â G8GNZ Â Â JO01fq: Â Chelmsford, Â Essex, Â UK
<
geoff@... Using Linux: Ubuntu 11.04 on Intel or Debian on UltraSparc
and even on the NAS. Â Â Avoiding Micro$oft like the plague.
#################################################
|
517|511|2012-07-01 09:00:54|Mansueto Grech|Re: FT290r case|
Hello Again Brian,
Had a look at the item you suggested an yes they are the right ones but I also need the chassis and back-plate.
Thanks for taking thy time to help me appreciated it very very much
73's
Mans. 9H1G
|
518|511|2012-07-01 10:31:04|briandowner2003|Re: FT290r case|
Hi Mans,
I would contact the seller through EBay and see if he has the other parts. If he has the covers he may well have the chassis and backplate, if he has broken up a broken 290
Cheers
Brian
|
519|509|2012-07-01 17:48:53|dbztuzujdhgtrjzthxh|Re: Failure to boot properly|
Hi Gordon,
no, my intention to replace some electrolytics is not based on some "ZOMG".
Nor will it be undertaken on the basis that "If it's working, leave it alone".
Firstly, as stated, it is "not working" and on that basis, a repair is desirable.
Secondly, my personal experience of several FT290s shows that many of the original electrolytics are reaching 'end of life'.
Often corrosion is evident around the legs (caused by leaking electrolyte), but even when not, the capacitance, if measured, can be out by a large margin.
For reasons unknown to me, the caps around the audio amp seem particularly prone to failure. On the last set I worked on, one cap (C137) had one leg corroded through and another (C132 - 47uF) only measured 5uF when tested.
In general I agree with you that there is often little benefit replacing parts wholesale, but there are times where failure of one part will cause the destruction of many (a specific reference to HP141T PSU caps).
Back to the point: if you'd like to suggest an alternative plausible explanation for the symptoms observed, I'd be happy to follow it up.
73
ian
|
520|520|2012-07-23 23:03:50|paolo passerini|S-meter staying HI|
Hi, I'm Paolo IW2HEU. I joined this group because I need help for a trouble happened to my ft-290r. I reported an issue with the S-meter. When I power on the radio the S-meter gauge goes on S9 position. After a several minutes (10 -20 or more) the gauge starts to lower and stop at abt S1 after a lot of time. During this time I don't have any problem with sensitivity;so I don't think the ALC line is involved in. I suspect on an elctrolytic but I actually never start to look for the trouble. I saw there was a similar post (an early day's one) from radiovintage 2000 and g3vvt in 2007.
Does anyone has exeperience of this issue?
Many thanks, 73
excuse me for my english
Paolo, IW2HEU
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521|520|2012-07-25 17:45:04|zaktherabbit|Re: S-meter staying HI|
Hi Paolo,
Look in the files section, there is a simple mod using a 47k resistor across one of the transistors, this much improves the problem.
It seems to be widely considered that the problem comes from the quality of the PCB material. There are many discussions on here about this problem.
One simple way to improve it, is to make use of the radio as much as possible!
Martin G7MRV
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522|522|2012-07-28 22:50:38|rhpickett|Microphone element for YM47 Microphone|
Hello Everyone,
I recently acquired a FT290r with an intermittent in the microphone. Traced it down to a loose connection at the microphone element itself. One of the tabs glued to the side of the element has come loose. I attempted to reconnect with no success.
Currently looking for a replacement dynamic mic element of the proper size and impedance. I have found one 500 ohm element that will work but I will have to do some major surgery to
fit it into the existing case (larger than the original)
Does anyone know of a source for microphone elements?
Thanks!
Rex, K0REX/7
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523|523|2012-08-12 18:06:57|kb1qzh|New Member With F290R Questions (LCD and mods)|
Hi Everyone,
I had bought a FT-290R Mk1 from a weak signal ham a few months ago and I'm just getting to using. I bought it for future use with a transverter. The seller had modified it for a transverter and let me know it had a LCD problem. I have powered it on but no QSO yet, just listening.
The LCD Problem:
The left most digit doesn't turn on unless you press on the screen. How should i go about fixing this?
Upgrades:
What can I do to get more use out of the radio? Add tone support? The Mutek front end? is there a LiPo battery pack that can be used?
Thanks,
Frank b
kb1qzh
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524|523|2012-08-12 18:17:40|Gordon JC Pearce|Re: New Member With F290R Questions (LCD and mods)|
On 12/08/12 17:06, kb1qzh wrote:
The little contacts on the PCB, the rubber strip, or the glass need
cleaning. It's a simple job that requires taking the radio apart until
it looks like one of those frankly terrifying pictures of a gearbox with
a five-spanner rating that you find in Haynes manuals.
Once you've got the panel apart, very carefully cleaning the edge
connector on the LCD PCB with some IPA will probably sort it. It's
worth swapping the backlight bulb for an LED while you're in there. You
don't want to get it apart twice.
The Mutek front-end is pretty good. I mostly only use mine on simplex
FM or SSB, so the lack of CTCSS isn't really a problem for me.
Since the FT290 runs off about 10kg of HP11 batteries, there's a lot of
space for them. If you wanted to run a LiPo you'd need to squeeze in a
regulator and charging circuit, but that would still give you masses of
space for the battery pack. If you do this, you'll have a battery life
measured in days but your FT290 will no longer be suitable for weight
training.
--
Gordonjcp MM0YEQ
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525|523|2012-08-13 10:20:08|Mansueto Grech|Re: New Member With F290R Questions (LCD and mods)|
Hi Frank,
All you need to do is to carefully remove the display unit and slowly and carefully dismantle it parts. Mainly if memory serves me well, it is made of a main PCB with to strips of conducting rubber and the actual display. Just clean the conducting rubber and the LCD display and reassemble.
That should do the job for you.Â
MAY I SUGGEST to take some pic whilst disassembling to aid you during the reverse process.
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526|523|2012-08-13 12:51:29|g3vvt|Re: New Member With F290R Questions (LCD and mods)|
Hi Frank,
There a few articles by Ian G0JRE and others in mods.dk for the Yaesu FT-290R regarding the replacement of the lamp. I you follow these at least one of them mentions the problem with the LCD digits and how to cure the problem you have. The important thing it does give a step by step method of accessing the LCD as well as the lamp. Took the time to download these from the mods.dk site and have them in my FT-290R notes file for future.
Regards,
Bob, G3VVT
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527|523|2012-08-13 17:44:11|kb1qzh|Re: New Member With F290R Questions (LCD and mods)|
Thanks everyone!!
Question on lamp replacement (might as well do the LED conversion, right?) Is the LED something special or can I use from the local electronics store?
73
Frank
kb1qzh
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528|509|2012-08-15 16:13:28|dbztuzujdhgtrjzthxh|Re: Failure to boot properly|
Hi all,
to continue the story, I pulled the `290 apart to give access to the CPU board today.
There are only two electrolytics on that PCB, so I replaced them both (both 10uf 16V). As they are only about 4mm diam, I replaced them with tants.
Interestingly one looked fine while the other showed more than its share of leakage.
Naturally you can't see any sign of leakage until the cap has been removed!
http://groups.yahoo.com/group/electrichandbag/photos/album/884029765/pic/956380291/view|
529|529|2012-08-27 21:20:44|Gary VK2KYP|RX Mute|
Hi All, I brought a second hand FT290 Mk1 one of its problems is when you go to transmit your voice appears out of the speaker. There seems to be a problem with the muting of the Rx when I am transmitting.
Has anyone else experienced this and how did you solve this problem?
Thank you
73 Gary VK2KYP
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530|529|2012-08-29 22:49:06|Gary VK2KYP|Re: RX Mute|
Good Moring from VK.
I have solved a few problems in my FT-290R
1) A previous owner must have had trouble with the audio output stage as this has been replaced by a LM388 amplifier mounted on a piece of veroboard. This amplifier was getting RF into it and 1000pF capacitor across its input solved the audio rectification problem.
2) The common ALC/AGC problem was solved with a 47k resistor across the base emitter junction of Q1014.
I am now chasing the lack of CW side tone. The side tone is being generated but is not finding its way to the LM386 audio amp.
I am looking for a copper side overlay of the PCB to help me trace the side tone routing.
Thank you
73 Gary vk2kyp
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531|447|2012-08-30 23:09:52|dbztuzujdhgtrjzthxh|Re: Newbie with display/freq problems. 290 mk1|
Hi Pete,
did you ever sort out this problem?
I've recently acquired an FT290r and although to appears to be in very good shape, like yours, it's 25kHz off freq.
To be exactly one channel off seems to be more than a simple coincidence to me.
Like yours, mine Tx and Rx on the same freq. which is 25kHz below what is displayed.
73
ian
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532|447|2012-08-31 08:46:58|Pete Gow|Re: Newbie with display/freq problems. 290 mk1|
Hi Ian.
Yes it was sorted and it was the VCO that was off, very small adjustments were made
until it came into line and then it was out with the scope and sig gen to get the final alignment.
73 Pete de G7VHJ
To: electrichandbag@yahoogroups.com
From: dbztuzujdhgtrjzthxh@...
Date: Wed, 29 Aug 2012 09:17:25 +0000
Subject : [electrichandbag] Re: Newbie with display/freq problems. 290 mk1
Hi Pete,
did you ever sort out this problem?
I've recently acquired an FT290r and although to appears to be in very good shape, like yours, it's 25kHz off freq.
To be exactly one channel off seems to be more than a simple coincidence to me.
Like yours, mine Tx and Rx on the same freq. which is 25kHz below what is displayed.
73
ian
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533|447|2012-09-08 12:20:53|dbztuzujdhgtrjzthxh|Re: Newbie with display/freq problems. 290 mk1|
Cheers Pet, thanks for the reply.
Rather disturbingly, mine my set has returned to a more common 1.5kHz error (as measured on an uncalibrated, std.XO HP5315A).
Nothing has been adjusted in the meantime, however I did replace the cap soldered to T2005. Not sure if the cap had an effect, heat from soldering or something completely unrelated. Not exactly a satisfactory solution, but I guess it will have to do for now.
73
ian
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534|534|2012-09-13 16:25:10|kate9966|Plastic hold down for LCD display|
Hi all,
I have a question, I have a unit where the little plastic frame that holds the LCD down firmly against the elastomer strips has a broken tab.
The result is that you can't see the display unless you gently press on it with a finger, or eraser or some such.
I actually tried to screw it down by drilling a tiny hole and putting an 80-00 screw and nut through it, but that didn't work.
I'm guessing that just replacing the plastic frame would take care of the problem.
Another problem I've considered is, do those elastomer strips ever get old??? I've cleaned them a couple of times with IPA and a q-tip, and given that pressing on the display makes it work I'm thinking that it is just the frame.
Any thoughts? Anyone know where I might get a working plastic frame? or have any other ideas on fixing this?
Other than this, the radio works fine, well, except for the backlight, and memory battery, and possibly a minor alignment.
Thanks for your thougths,
Mike
KB0ozn
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535|535|2012-10-31 09:57:06|Michele|My Electric Handbag|
Hello everybody,
since the group has been silent for a while, let me waste some bandwidth by telling the story of my FT290R (first series). This was the first all-more VHF radio I had when I was "young", and had a lot of fun with it, hiking mountains to get the longest hops, etc.
Then in the early 2000s I sold it to get money to buy the "brand new" FT817.. after few years, guess what ? Yes, I missed it... so this autumn I started a search to get one, and eventually found one for a reasonable price. Cosmetically kind of ok, it had the usual electrical "quirks" due to age: FM starting to work after few seconds being turned on, S-meter sometimes sloooowly going back to "0", etc.
So I decided to take the "brute-force" approach and I changed ALL the electrolytic capacitors; I took it as a hobby (what it actually is) and replaced maybe 2 or 3 caps a day (and not every day), taking it slowly, relaxing and enjoying doing it... It took me 10 euros of components and 3 weeks of time, but eventually more than 40 caps were replaced. I also did an alignment, that was somehow needed after caps replacement (expecially carrier balance in SSB mode). Now (knocking of wood) it seems to work flawlessly... I bought new C-size 4000 mAh NiMh batteries, whose charge will possibly last forever... now I am ready to have some fun again with the "new old" FT290R.
73,
Michele IZ2EAS
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536|536|2012-10-31 10:38:36|Michele|Addenda...|
In my previous mail I forgot to ask... The memory knob of my FT290R is cracked; I glued it and it works fine, but I really would like to replace it with a good one; does anybody have an extra memory/band knob that doed not use, and want to part from it? (BTW, I am in Italy...)
73,
Michele IZ2EAS
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537|535|2012-10-31 13:06:24|Geoff Blake|Re: My Electric Handbag|
Hi Michele, group,
As a long term advocate of block replacement of electrolytics, well
done and I hope that your FT290R is back to 99% operation. Have you
had the opportunity to carry out any measurements of the sensitivity,
frequency accuracy etc.
As a (now retired) test equipment engineer I can confirm that much
equipment of perhaps 20+ years of age show a noticeable deterioration
in performance due to ageing electrolytic capacitors, however this is
dependent on the manufacture of the capacitors, as they say, "you get
what you pay for" and generally the domestic market (I include much
amateur equipment here) is built down to a price rather than up to a
quality standard.
73 Geoff, G8GNZ
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538|536|2012-10-31 14:11:20|John S|Re: Addenda...|
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539|536|2012-10-31 18:33:44|Michele|Re: Addenda...|
Hi John,
thanks for the link, I do know the seller.. actually, he is selling the whole set of knobs, kind of an overkill in my case... I just need one!
73,
Michele IZ2EAS
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540|535|2012-10-31 18:41:07|Michele|Re: My Electric Handbag|
Hi Geoff, group,
yes, I too found more effective to change them all... the cost of the components is very low, the originals are 30 years old anyway, and since I was there and the radio was opened on the bench...
Now it seems to be working 100% (fingers crossed...); I re-aligned the PLL LO (slightly out of frequency), and re-balanced the SSB carrier. Everything else seems to be in spec, including sensitivity (I did a quick-and-dirty test using a modern receiver).
It will be fun to use it....
73, Michele IZ2EAS
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541|535|2012-10-31 20:38:38|Geoff Blake|Re: My Electric Handbag|
Hi Michele, group,
I am very pleased to hear the results are so good and perhaps it will
encourage other FT290 and similar model owners to resurrect their
equipment at low cost.
73 Geoff G8GNZ
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542|542|2012-11-05 12:55:38|Geert Jan de Groot|Fading display: cleaning LCD contacts?|
Greetings all,
I'm working on an FT-290 fixer-upper where, among other (now-fixed) problems,
the segments of the LCD are fading. All segments are working,
just poor contrast (grey instead of dark black).
I note that the VSS voltage of the LCD module is not connected to ground,
but connected to a setup involving a NTC, supposedly to make the
contrast temperature-independent. I tried varying the voltage a bit but
did not see a clear difference in contrast.
Since the LCD module doesn't have a `ground` connection (VSS floats
at about +2V), where does the module get it's 0V from?
One of the comments in the files is to "disassemble the LCD module and
clean the rubber contact strip". Has anyone tried that recently,
good or bad, as I'm worried that taking apart a 30-year old plastic
construction will make matters worse. Recent experiences appreciated.
Also can't find specs of the Texas Instruments TP0401 driver chip anywhere.
Oh, when I started working on the unit, it didn't work at all: turns out
the soldering of the big voltage regulator transistor on the regulator board
(the pertinax board with the backup battary on it) had cracked.
Symptoms were that the battary meter worked, but nothing else,
and the unit only pulled 10mA instead of the usual 60-70mA idle current.
Soldering the ping through fixed the problem, hopefully for another 30 years.
73,
Geert Jan PE1HZG
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543|542|2012-11-05 15:36:12|brian.flynn@tiscali.co.uk|Re: Fading display: cleaning LCD contacts?|
I just disassembled the display of one about 4 weeks ago and cleaned the
contacts. There was not signs of the contact rubber degrading on that
specimen. I used a cotton bud and some IPA to do the cleaning. My unit
had some stuck segments which stay on all the time and that did not
respond to cleaning. The display did get darker after the clean so I
suppose that was a plus. I use the radio as a microwave IF. I have a
couple and they work well for that.
73s
Brian GM8BJF.
--
Dr Brian W Flynn
15 Riselaw Crescent
Edinburgh
EH10 6HN
0131 447 4043
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544|544|2012-12-20 11:36:59|m6poa|12V at the antenna socket?|
Hi there all,
My FT-290 Mk1 isn't giving 12V at the antenna socket when transmitting which means I can't get it to drive my transverter.
I've been told it may be a common problem, but can't find any info anywhere.
Does anyone got any ideas where the problem may lie?
Thanks in advance,
Jon
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545|544|2012-12-20 15:24:30|gi0gdp|Re: 12V at the antenna socket?|
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546|544|2012-12-21 13:00:15|GM8BJF|Re: 12V at the antenna socket?|
In their unmodified state these radios put a dc voltage out of the antenna socket when on transmit. The idea behind this was to operate external accessories such as PAs and tranverters. I use it to operate the switching on my microwave transverters. It can be blocked off with a small ceramic cap if not wanted.
73s
Brian,
GM8BJF.
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547|544|2013-01-02 14:07:05|m6poa|Re: 12V at the antenna socket?|
Thanks for the replies, sorry for the delay, festive season and all that.
I finally managed to get time to try the 290 without the antenna screwed in; no joy firing the transverter.
I'm wondering if the output DC is supposed to be 12V though. Would 6.8V be feasible? There is an output, but it's nearer 10 than 12V.
Thanks again,
Jon
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548|548|2013-01-06 02:57:38|Wayne|Finer FM frequency steps for the FT-790RII|
All
G'day, new to this group after recently obtaining a FT-790RII.
Just getting use to operating a new radio, I found that the STEPS on FM were too clunky (large) with the standard being 12.5, 25 and 50KHz.
I would like to have finer frequency steps.
I looked on the internet for any suggestions. NIL
However after locating the circuit diagrams, thanks to IW2HEU
http://www.radiomanual.info/YAESU_UHF.html I had a closer look at the CPU unit circuit.
I noticed a link that was marked on the circuit as:
OPEN: 5KHz Steps
CLOSED: 12.5KHz Steps
This is connected to the P2502 connector (Pin 3).
So I tried locating this.
To cut a long story short, here are the steps to do this. After trying to get access to the CPU board, I latter found an easier way. This is described here.
NOTE: I take no responsibility for your radio if you attempt to perform this mod. It is just a fact sharing exercise.
(1) Remove DC power to the unit.
(2) Remove all the knobs from the front panel and their associated nuts etc. Place them in a safe place, and in some order for easier reassembly.
(3) Remove the microphone socket nut as well. Do not remove the BNC retaining nut (learnt the hard way). It's a difficult job putting it back on.
(4) Remove the top and bottom covers. Also the side cheeks.
(5) Remove the coax connector toward the rear of the top PCB. This is the other end of the cable that goes to the front BNC connector.
(6) Carefully unstick the copper tape that is stuck on to the front panel. This is near the screw holes from the front of the top and bottom covers.
(7) Remove the front panel. There are interconnecting wires between the CPU and SWITCH Unit PCB's. Notice that Yaesu use the Resistor colour code for wiring up the connectors (Brown = pin 1, Orange = pin 3 etc)
(8) Desolder the cable that is going to the STEP switch. In my unit it is the ORANGE wire, that is connected to PIN 3 of P2502 connector on the CPU PCB. Cover the end of this cable so that it does not short with anything. Note: this is not the orange wire that is connected to the CPU PCB with no connector (hard wired to the PCB)
(9) Reassemble in the reverse order.
My radio now tunes in the following steps for the FM Mode: 5, 10 and 20KHz. SSB/CW STEPS were unaffected.
Hope this may be of assistance.
Regards
Wayne
VK5APN
PF95jg
http://people.aapt.net.au/~pearsons|
549|238|2013-01-15 06:50:10|kf7bsf|Re: FT-790RII overmodulation on transmit|
I know I posted this a while back, but I wanted to update the group on my findings.
As it turns out, the radio is fine. The detachable power amp is bad causing the distortion. I ve verified this on the air with the help of some friends.
Does anyone have one of these amps or any information on repairing them?
73 de KF7BSF
Gene
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550|238|2013-01-15 14:59:52|g3vvt@aol.com|Re: FT-790RII overmodulation on transmit|
Hi Gene,
Sounds more like a classic case of over deviation. I have some notes passed verbally for the FT-290RII and have the schematics which are possibly from Mods.DK.
The notes I have say: Deviation control is VR05 which is located 2" from the back on the speaker side and 2" from the RHS next to a PLG/SKT viewed from the top of the radio.
Normal setting would be for a peak deviation of +/- 4.5kHz, though with the increased use of narrow deviation here I now use a compromise figure of +/-3.0kHz speech + 250Hz CTCSS which comes out at +/- 3.25kHz total peak deviation. This fits in with older amateur radios and yet is still able to pass through the IF filters of modern LMR repeaters as long as channel frequency settings are accurate. I also noted that the deviation control in the FT-290RII works in the normal sense. Clockwise = increase, anti-clock = decrease. Hopefully the FT-790RII is similar.
Regards,
Bob, G3VVT
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551|551|2013-02-17 21:04:24|yorkscouts|FT-290 Narrow band deviation for UK Repeaters|
I have an FT-290 that I have installed a CTCSS module in and I now need to setup the FT-290 to narrow band FM deviation for use on UK repeaters.
I have a friend of a friend who is in the trade and has access to the set up equipment. What specification do I need to give him for the FM deviation and the CTCSS deviation???
Thanks
Dean G7PFN
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552|551|2013-02-17 22:10:55|Geoff Blake|Re: FT-290 Narrow band deviation for UK Repeaters|
FM deviation: 2.5kHz max, ideally 2.4kHz, CTCSS tones: 500Hz max,
ideally 400Hz. These IIRC are the specs for PMR 12.5kHz channelling
and should be used on 2m and 70cm.
Geoff G8GNZ
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553|551|2013-02-18 16:05:19|g3vvt|Re: FT-290 Narrow band deviation for UK Repeaters|
Hi Dean,
The PMR figure is normally an absolute maximum of +/-2.5kHz, though have seen figures quoted from +/-2.2kHz to 2.5kHz. The CTCSS deviation however should be about +/-250Hz for 12.5kHz channel usage as the +/-500Hz figure is normally for 25kHz channel use only. In the repeaters I maintain with a repeater control logic system which uses the CML FX365C CTCSS chip, this will detect a valid decode at +/-100Hz deviation whatever the channel spacing. Other logic systems can be better or worse from this figure. Running the CTCSS too high can result in complaints of an apparent buzz on the audio particularly on older radios that do not filter out the audio spectrum below 300Hz.
A spanner in the works for all this and a point missed by many is that the deviation of a TX is additive.
In other words +/-2.25kHz speech + +/-250Hz CTCSS will give you a total deviation of +/-2.5kHz which is the normal PMR limit for a 12.5kHz channel.
As there is a need the FT-290R and other similar older radios to work in simplex mode with possibly 25kHz channel specification radios, a compromise has to be made.
As the usage is for amateur use only and with a radio such as this that has only one deviation setting available have adopted a compromise deviation setting of +/-3kHz for the speech and +/-250Hz CTCSS. For this to be acceptable the radio must be accurately on channel, a point which some FT-290R fall down on, though can be adjusted with care to be correct. The reason this can work is that the IF filters fitted to PMR radios with 12.5kHz channel spacing give a bandwidth of +/-3.75kHz (7.5kHz total BW) and the figure I use will just fit with a little spare. Running with deviation too high or with the TX (or the RX at the other end) not on frequency can result in the squelch closing momentarily when the deviation goes beyond the RX IF filter BW limits or increasing audio distortion as the filter BW is exceeded. Most of the radios used for repeaters in my care are now of the more recent PMR type in interests of improved reliability.
Regards,
Bob, G3VVT
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554|554|2013-02-25 00:39:05|g4ufs|LCD screen|
Hi,
There seems to be a common problem with some 290s where the screen "bleeds". I have one such screen which is so bad that I can only make out the first digit :(
Has anyone any idea if this can be repaired some way or where I might get a replacement.
Has anyone ever seen a conversion to an LCD perhaps?
Regards
Dave
G4UFS
|
555|554|2013-02-25 16:46:33|g3vvt|Re: LCD screen|
Hi Dave,
The only answer is to replace the LCD unit. Unsure whether there would be any chance of obtaining a replacement from Yaesu UK, but I did manage fairly recently to buy a replacement volume/squelch/ON-OFF control through them for my FT-480R which is a similar vintage.
The problem can occur when the radio is stored in an outside environment. I used to have an external shack that was just that, a wooden hut in the garden and lost several LCD displays in devices stored there. The LCD display does not always tolerate low temperatures and gives the effect you note in protest. Unsure if modern LCD are so afflicted, but early versions certainly were.
If a new LCD display cannot be obtained the choices are to maybe adapt one intended for another use, though that is probably highly unlikely to be suitable as this is a specialised device. The only other alternative is to get hold of an LCD display from a scrap FT-290R or FT-290RII depending on your version. If you can get hold of the Yaesu part number for the LCD a search of the Internet may possibly help.
As a side issue Geoff Brown who in the past supplied older model Yaesu service manuals or good copies where the originals were not available seems to have fallen off the radar. Anybody aware of a possible new link to him and the business? The link to his web site no longer works.
Regards,
Bob, G3VVT
|
556|554|2013-02-26 12:29:13|M1CXK|Re: LCD screen|
Hi Bob
Try
Rosscom radio communications
73
Allen M1CXK
|
557|554|2013-02-26 16:49:00|g3vvt|Re: LCD screen|
Hi Allen,
Yes, that is the new link to the Yaesu manuals from Geoff Brown, G4ICD. The new address for the manuals themselves is:
www.yaesumanuals.co.uk/ Always handy to have for Yaesu manuals no longer in print.
Regards,
Bob, G3VVT
|
558|554|2013-03-02 12:41:02|g4ufs|Re: LCD screen|
Thanks Bob,
I have tried all the usual places but nothing turning up so far. I guess I will have to hold on until some one is selling one on eBay. It's a shame I got the radio a couple of weeks ago and only the week prior, there was one on eBay :(
Regards
Dave
|
559|554|2013-03-02 12:42:23|g4ufs|Re: LCD screen|
Hi Allen,
It was the first place I tried and was quite hopeful but they had nothing :(
Dave
|
560|554|2013-03-02 13:41:45|Gordon JC Pearce|Re: LCD screen|
On 25/02/13 14:46,
g3vvt@... wrote:
There must be some sort of tiny little LCD that will physically fit the
front panel. The clever bit will be reverse-engineering the serial
protocol from the FTx90 control board to the LCD, and then once that's
out the way it will only be a case of making up a wee microcontroller
board to interpret that and drive the "new" LCD.
Simple, eh?
--
Gordonjcp MM0YEQ
|
561|554|2013-03-04 02:15:31|g4ufs|Re: LCD screen|
Actually it's not beyond the realms of possibility. The connector to the screen has 9 pins. 2 of those are for power, leaving 7 data pins. I have already scoped those hoping for inspiration but nothing is jumping out at me. I'll need a logic analyser to make more sense.
'Have not seen LCDs on the hobby market that size but a small bank of 7 segment LEDs might do the job. Programming a PIC micro would be pretty simple if I could crack the protocol from the CPU. I had a look at the LCD controller chip but there doesn't seem to be a data sheet for it :(
|
562|554|2013-03-04 10:11:02|Gordon JC Pearce|Re: LCD screen|
On 04/03/13 00:15, g4ufs wrote:
I believe it is four data lines, and a couple of latch lines.
I'd use an AVR rather than PIC, because PIC is slower, more power-hungry
and has horrible programming requirements. I'm not especially keen on
using stuff without a Free-as-in-Speech toolchain for amateur radio
stuff, either.
--
Gordonjcp MM0YEQ
|
563|554|2013-03-04 21:19:56|workherz|Re: LCD screen|
Hi Bob, might be able to help, I have a ft290 here with the ALC problem. I had to remove Q1014 to get it to work. (been unable to get to the bottom of it so far, another story).
Apart from that its all working, even has a spare PA transistor Q2022.
Your welcome to it for a reasonable offer.
John
|
564|564|2013-04-06 00:19:12|kf7bsf|Looking for amp|
I'm looking for the clip-on amp for an FT-790R2. Does anyone have ideas about where I might locate one?
Thanks,
Gene
|
565|565|2013-04-25 22:43:29|m0xvf|FT 290 Mk1 RX problem|
Hello Group,
I have acquired a Yaesu FT 290 Mk1 which I had intended for spares for my ageing Sommerkamp FT 290, but everything works apart from the RX and it seems a bit too good to throw in the junk box.The rx works for a very short time from switch on then just dies with the odd crackle from the speaker after that, but it still tx with audio. Can anyone shed any light on this-I'd love to get it working if possible.The speaker is fine and so is the volume pot.
Jeremy
M0XVF
|
566|566|2013-04-25 22:44:43|Panagiotis Perreas|Thank you!|
Martin et all.
Thank you for accepting me to the group.
I promise, I will behave myself!
73
Panos - SV3AUW / M0LPT
|
567|565|2013-04-26 12:56:24|Michele|Re: FT 290 Mk1 RX problem|
Hi Jeremy,
my FT290R MkI was also behaving oddly on RX.. sometimes the S-meter was going up with no signal (a classic !), or there was no audio for a while, after power-on.
I tried to replace some electrolytic capacitors "here and there" in the RX chain, where it seemed more appropriate, but with no luck... the malfunctions were still there !
So I took the "hard way" and replaced ALL the 40-something electrolytic capacitors, no matter where they were. It took me 10 euros of components and several hours of (part-time) work, but after that the FT290 behaved like new... no more problems, clear audio both on RX and TX.
So my advice is: replace them all, then see what happens...
73,
Michele IZ2EAS
|
568|565|2013-04-28 22:50:57|Jeremy Smith|Re: FT 290 Mk1 RX problem|
Hi Michele,
Thanks for the reply.The S meter works fine, but im certain the problem lies with capacitors. I hadnt banked on replacing all of them but I will make a start in some places and take it from there.
Cheers
Jeremy
M0XVF
------------------------------
|
569|565|2013-04-29 02:18:41|g4ufs|Re: FT 290 Mk1 RX problem|
Hi Jetemy,
I sent you mail to your personal mail address but you may not have received it.
I had the exact same fault and pinned it down to an electrolytic in the audio amp. If you wiggle the caps around the amplifier chip you should hear the his come and go.
It took the best part of 15 minutes to replace :)
Good luck
Dave
G4UFS
|
570|565|2013-04-29 23:25:04|Jeremy Smith|Re: FT 290 Mk1 RX problem|
Hi Dave ,
Yes I got your email I really appreciate the help.I replied to your yahoo address perhaps it is in your spam box ?
Many thanks,
Jeremy
M0XVF
------------------------------
|
571|565|2013-04-30 00:55:41|Dave P|Re: FT 290 Mk1 RX problem|
Hi Jeremy,
Just checked and your mail is indeed in the spam box.
The audio amp is, as you suggest, Q1027. The cap I replaced was C132 but any of the electrolytics can fail which is why some people choose to do a full replacement. Most modern electrolytics will dome over the top when they fail but older ones have different cans.
I was really pleased when I bought my 290. It was fully working for the first 15 minutes and then the audio just faded as if I had turned the volume down. Leaving it on, it would intermittently fade back for a while and then fade to nothing again. I think heat was affecting it.
If your fault sounds similar then I'd put money on it being the above. Let me know how you get on
73
Dave
G4UFS
|
572|565|2013-05-01 23:10:19|Jeremy Smith|Re: FT 290 Mk1 RX problem|
Hello again group,
A quick update to the 290 rx problem. I have changed half a dozen caps around the audio amp but no success yes. However upon removing the battery tray it was painfully apparent that someone had tried something like this before with a hot poker.......
Jeremy
M0XVF
------------------------------
|
573|565|2013-05-01 23:16:26|Gordon JC Pearce|Re: FT 290 Mk1 RX problem|
On 01/05/13 21:40, Jeremy Smith wrote:
This is why shotgunning parts is never a solution!
There must be a *reason* why it's misbehaving, and just saying "oh it's
got bad caps" isn't the reason. Take your time and try to undo some of
the previous butchery ;-)
FWIW I have replaced about a dozen genuinely faulty electrolytics in
about 20-odd years of repairing stuff, and more faulty ceramic caps this
year than I can even remember...
--
Gordonjcp MM0YEQ
|
574|565|2013-05-11 23:43:24|Jeremy Smith|Re: FT 290 Mk1 RX problem|
Hello Group,
Sorry about the delay in reposting but....................
After spending time making good a previous repair, I have replaced all the caps and as a good few of you had stated before, after removing some of them-and only after removing them-you could tell they were past their best.
The FT 290 has now been working for a week with absolutely no problem,good audio reports, brilliant RX and plenty of contacts made.So rather than have a spares donor for my Sommerkamp 290, I have a spare radio.The radio with be going on an unlimited forever loan to a good friend of mine, a disabled G4 who had to sell his previous 2m multimode to fund new batteries for his wheelchair.He will be smiling tomorrow as he knows nothing of this.
Thank you to all members of the group that helped me with this repair-its really put a smile on my face to hear the white noise of the RX finally !
73 and very many thanks,
Jeremy M0XVF
|
575|565|2013-05-12 11:34:19|Mansueto Grech|Re: FT 290 Mk1 RX problem|
Well done Jeremy on both counts. I am sure you friend will appreciate the "loan" and maybe who knows He might even get to 9H via ES. Hi hi
Question for the group. Anyone has a component layout for the 290R ?
Thanks in advance
73's
Mans 9H1GB
|
576|565|2013-05-13 13:55:16|Michele|Re: FT 290 Mk1 RX problem|
Good Job Jeremy !
Electrolytic capacitors are a well-known weakness of the FT290R, and after 30 years they have well passed they expected life.
Since the radio is open and dismantled, it takes much less time and it is much less frustrating to change all of them.. the ones that haven't failed yet, will fail in a short time anyway (and could take some semiconductors with them...) !
I am sure you (or your friend) will experience a long time of trouble-free operations with the restored FT290R.
73,
Michele IZ2EAS
|
577|2|2013-06-03 23:55:42|electrichandbag@yahoogroups.com|New file uploaded to electrichandbag |
Hello,
This email message is a notification to let you know that
a file has been uploaded to the Files area of the electrichandbag
group.
File : /Component Layouts/FT-290R Board Layout.pdf
Uploaded by : jeryb77 <
jeryb77@... Description :
You can access this file at the URL:
http://groups.yahoo.com/group/electrichandbag/files/Component%20Layouts/FT-290R%20Board%20Layout.pdf To learn more about file sharing for your group, please visit:
http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.html Regards,
jeryb77 <
jeryb77@...|
578|2|2013-06-03 23:56:44|electrichandbag@yahoogroups.com|New file uploaded to electrichandbag |
Hello,
This email message is a notification to let you know that
a file has been uploaded to the Files area of the electrichandbag
group.
File : /Component Layouts/FT-790R Board Layout.pdf
Uploaded by : jeryb77 <
jeryb77@... Description :
You can access this file at the URL:
http://groups.yahoo.com/group/electrichandbag/files/Component%20Layouts/FT-790R%20Board%20Layout.pdf To learn more about file sharing for your group, please visit:
http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.html Regards,
jeryb77 <
jeryb77@...|
579|2|2013-06-04 00:10:47|electrichandbag@yahoogroups.com|New file uploaded to electrichandbag |
Hello,
This email message is a notification to let you know that
a file has been uploaded to the Files area of the electrichandbag
group.
File : /FT-290R PLL Voltages.pdf
Uploaded by : jeryb77 <
jeryb77@... Description : FT-290R PLL Voltage Chart
You can access this file at the URL:
http://groups.yahoo.com/group/electrichandbag/files/FT-290R%20PLL%20Voltages.pdf To learn more about file sharing for your group, please visit:
http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.html Regards,
jeryb77 <
jeryb77@...|
580|2|2013-06-04 00:12:07|electrichandbag@yahoogroups.com|New file uploaded to electrichandbag |
Hello,
This email message is a notification to let you know that
a file has been uploaded to the Files area of the electrichandbag
group.
File : /FT-290R Sig Leak Mod.pdf
Uploaded by : jeryb77 <
jeryb77@... Description : FT-290R Reference Signal Leak Mod
You can access this file at the URL:
http://groups.yahoo.com/group/electrichandbag/files/FT-290R%20Sig%20Leak%20Mod.pdf To learn more about file sharing for your group, please visit:
http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.html Regards,
jeryb77 <
jeryb77@...|
581|581|2013-06-04 00:17:12|jeryb77|New Files Uploaded|
Hi All,
I was looking through some of my files and found some FT-290 and Ft-790 documents. These are all for the original MKI Series.
I scanned everything I found and have uploaded them.
FT-290R
Main Board Component Layout
PLL Voltage Chart
Reference Signal Leak Mod
FT-790R
Main Board Component Layout
I'm sure many will welcome the board layout files.
73,
Jerry
WA8R
|
582|581|2013-06-04 11:05:11|Michele|Re: New Files Uploaded|
Thanks Jerry !
Michele
|
583|581|2013-06-04 12:23:44|Mansueto Grech|Re: New Files Uploaded|
Hi Jerry,
Thanks. for that.Â
Can I ask in which folder are theÂ
FT-290RÂ
PLL Voltage Chart
Reference Signal Leak Mod
as I can't seem to find them please.
Again
Thanks and 73's
Mans. 9H1GB
|
584|581|2013-06-04 15:44:27|jeryb77|Re: New Files Uploaded|
Hi Mans,
Just click on the "Files" section.
They are listed there and not in individual folders.
73,
Jerry
WA8R
|
585|581|2013-06-04 18:33:08|Mansueto Grech|Re: New Files Uploaded|
Hi Jerry,
Thanks for the reply.
73's
Mans. 9H1GB
|
586|581|2013-06-04 23:58:26|dbztuzujdhgtrjzthxh|Re: New Files Uploaded|
Stunning Jerry,
Thanks very much,
73
ian
|
587|581|2013-06-05 05:20:19|jeryb77|Re: New Files Uploaded|
For anyone else looking for these files, I have moved them to a folder named "FT-290R PLL"
73,
Jerry
WA8R
|
588|588|2013-06-30 00:21:38|zaktherabbit|290 and modern data modes?|
Im wondering if anyone is using their FT-290 to run modern QRP/weak signal data modes, such as WSPR/JT-65?
If so, how are you finding its performance? In particular, are you finding it frequency stable enough?
|
589|588|2013-06-30 11:27:58|zl1ujg|Re: 290 and modern data modes?|
Hi,
I tried running the FT290R11 on FSK441 but the PA is next to the crystal oscillator for the PLL so there is drift.
Kevin
ZL1UJG
|
590|590|2013-07-13 18:19:49|Naqoyqatsi (aka the ICM)|Texas device TP0401N|
I am desperately trying to find the data and pin outs for this device which is the LCD driver on the 290/690/790 (and other) rigs.
Texas have been no use and neither have Yaesu and countless searches on the net have come up with nothing.
Does any body on this group happen to have the Texas data on this chip?
Thanks
Slim G4IPZ
|
591|588|2013-08-03 13:44:40|m0jsw|Re: 290 and modern data modes?|
--- In
electrichandbag@yahoogroups.com, "zaktherabbit"
I am just in the process of setting up my first serious attempt at working vhf and one of the thing I am very keen on is using the data modes.I`ll be very happy to share my results and will be very keen to hear the results of others,in particular our european members.....Jes m0jsw|
592|592|2013-08-05 01:02:41|peterwalker1999|FT-290R with FM problem|
I have a FT290R mk1, and it has a problem with FM recieve.
FM TX is OK, and all SSB and CW are fine.
The problem is intermittent sensitivity.
When the radio is turned on it works fine, but after about 10 mins the FM audio starts to drop out erratically (either there or it is not there) getting wors and worse untill it is not there all the time.
The CW and SSB recieve is OK during this, and the S meter deflection does not change. With the loss of audio the FM "hash" in the background is present, so it is not an audio problem, or a squelch problem. It just sounds like the recieved signal has deopped in signal strength.
As CW and SSB are unaffected, this indicates a problem on the second IF and Q1019 the FM demodulator chip.
The problem seems to be temperature related, so I have given the components around Q1019 a good blast with a freezer spray, but resulted in no change.
Tapping the board, flexing the board, and wiggling components and wires has resulted in no change!
I have changed Q1020, and swapped X03 with one from an FT-726.
I have changed all electrolytic capacitors around Q1019, and all ceramic chip capacitors, nothing of which makes a difference.
I also changed Q1019 in desperation, but again no difference!
Has anyone come across this problem before, and can make suggestions where to move the investigation to?
I have spent today repairing my HP141 spectrum analyser, so I will check out the local oscilator and 455Khz I.F. in more detail tomorrow to see if they are drifting around.
Thanks
Peter
|
593|592|2013-08-05 12:34:00|g0hzu|Re: FT-290R with FM problem|
I'd look to see if something is dragging down the base bias to the Q1020 transistor. It gets its bias via a 1M5 resistor so the ceramic filter CF01 could be pulling it down if it has gone leaky or there could be contamination on the PCB causing it or a leaky cap C106. Can you monitor the collector voltage at Q1020 to see if it gets biased off when the fault happens? i.e. the collector voltage will rise up to 6.8V if it loses bias.
Regards
Jeremy
|
594|592|2013-08-05 13:51:43|g3vvt|Re: FT-290R with FM problem|
Hi Peter,
Think that you are looking in the right area around Q1019. You do not say if you are using a signal generator for testing as checks with a stable signal generator can pay dividends, The FM RX chip the MC3357P seems reliable and does not normally give trouble with its use in a multitude of radios.
Check in particular that T13 and its resonating capacitor are not drifting as the device works as a co-incidence/quadrature detector and that is the resonating device. Should resonate at 455kHz which is checked when you are sure that all other items in the frequency conversion chain are correct and on frequency. Tune for maximum tone clarity and quieting with an on frequency signal.
Also check the 11.24MHz heterodyne xtal X03 is working OK though these are usually working or dead. The discrete FM IF normally used limiting and this in the past could be checked as a guide to the amount of IF signal present. Never had to go into this since the arrival of devices like the MC3357P and the various alternatives. Will study the device information sheets in my PC for clues if this helps.
OK on the HP 141T, a truly venerable beast. Originally were said to cost about $20,000 though were tough as old boots. Being rather heavy we used to carry them in transit cases between the seats in the centre of the GMC Suburban 4X4 trucks we had. Used them primarily to set up the deviation using the method of Bessel functions on our analogue microwave system. This was critical due to the effect it had on decoded multiplex channel levels. I bought a HP141T + 110MHz 8553B + 8552B IF in the in the 1990s in UK at a rally and later added the HP8554B 1250MHz module plus the HP8444A tracking generator. Had access to the HP service manuals at the time which helped in sorting out my acquisition.
Regards,
Bob, G3VVT
|
595|592|2013-08-05 21:20:05|peterwalker1999|Re: FT-290R with FM problem|
Bob and Jeremy
Thanks for the information and ideas where to look, I will try and get a look tonight.
I have been testing using an FM signal generator.
When working a -110dbm 3Khz modulated signal produces a fully quietened FM signal with the test tone clear.
However when not working correctly i need a -30dbm signal to get a fully quietened FM tone!
Peaking T13 works both when the FM is good and when it is bad, and it peaks at the same position.
I will certainly be checking the biasing of Q1020, as i have noticed the biasing everywhere is fluctuating between a good FM signal and a poor one, even pin 16 of Q1019 changes its biasing!
Thanks
peter
G0RSQ
|
596|592|2013-08-06 03:02:15|peterwalker1999|Re: FT-290R with FM problem|
Still no progress!
Checked bias on Q1020, and it is stable at about 2V on the collector.
Checked the 10.81 IF comming in on pin 16 of Q1019, and it looks OK, with no change between the two FM conditions. You can see the bandwidth, and the FM modulation, so The problem must be in the second IF.
Checked X03, and again rock steady, no fluctuation at either state of FM.
Checked the output of CF01, and now I get a good 455Khz signal when the FM works, and a scratchy signal when it isn't working!
Presumably the fault is before Q1020!
If I monitor pin 3 of Q1019, i can see a signal at about 10mhz, and I can erratically see the 455Khz signal. Looks like the problem is definatly to do with the 2nd IF.
I re-soldered CF01 using plenty of heat, and then the FM worked for about 1 Hour, before gradually dissapearing again, so i will try replacing CF01 with an equivelent part, an LT455EW, and see if this changes anything. After that i guess I will have to replace everything around Q1019 including resistors.
Peter
|
597|592|2013-08-06 09:05:47|kkyahoo|Re: FT-290R with FM problem|
Peter,
Sounds like it may be the filter. Might be worth just bridging it with a small C. These ceramic filters don't really like dc on them, not sure if that is the case in this set. TS2000 owners know all about that fault!
Kevin
|
598|592|2013-08-13 19:11:14|peterwalker1999|Re: FT-290R with FM problem|
Looks like the fault is with the T1013 transformer.
I replaced it with one from another 290R and all is well.
However I now need to find one to replace the faulty one!
Anyone got a scrap 290R they can let me have this transformer from, or sell for parts?
I have the specification for it, 1mH, 100pF and 100Kohm, but any leads as to where I can start looking for something suitable?
Thanks
peter
|
599|592|2013-08-14 11:42:53|g3vvt|Re: FT-290R with FM problem|
Hi Peter,
In the event that the correct part is not available for T1013, the inductor/capacitor from a 455kHz IF should work using the full primary winding.
Going back a lot of years in the days of Pye Cambridges and the like with mostly only AM types on the surplus market, made up an FM detector for a number of radios from the TBA120S TV IF/detector sound chip which was available in most TV service workshops and modulated the 8MHz rocks with a BY127 rectifier to get sufficient deviation. The only item noted was the LC ratio was important for recovered audio and stability on the FM detector. The resistor is used to damp the tuned circuit to get better stability and bandwidth, though wound our own inductors for 455kHz detectors.
Otherwise I would try changing the resonating capacitor on the defective transformer as that must be a key suspect. Resonance could be checked at 455kHz with a GDO.
Regards,
Bob, G3VVT
|
600|592|2013-08-14 20:25:08|peterwalker1999|Re: FT-290R with FM problem|
Bob
Thanks for the information. I had not apreciated that the tunned circuit was set for resonance at 455Khz (should have done the maths) so that will open up the possibilities for replacement parts.
I think the problem is with the ferite slug, and think it has split, as adjusting the bad one makes little difference, but the good one makes a big difference. Tried to get the metal can off, but far too delicate, and i dont want to destroy the inductor, as i have got it to work much better by adding more capacitance to the existing internal one 68p plus a 15p trimmer, and this seems to get the FM pretty good.
Thanks again
peter
|
601|565|2013-10-27 23:48:01|zl1ujg|Re: FT 290 Mk1 RX problem|
Hi,
My FT290 Mk1 had the dreaded slow start up, which I recovered using the 47k trick.
Just recently I have noticed, no slow start up,...but works on TX.
I will see if it the meter working on Rx with my signal generator
I measured where I could with a Digital multimeter and the AGC volts appeared to bottom out around 0v. Minus 6.8v was present
The unit has been kept in the house with a ventilation system (which drives moisture out). ..
I have been reading other info. The Ft290R11 has the fast time constant ceramic across the 1M5 time constant resistor, but the circuit is remarkably similar
Other units (FT726) have stated that ceramic capacitors have been a problem in the AGC circuit. I have personally replaced leaky ceramic capacitors in my day-job
The AGC DC amplifier works on a very low base current ~ 50nA, so any PCB leakage might be a problem.
One could mount the three base components in mid air.
It is possible that the ALC works as it is a lower impedance source. I have also seen leaky diodes of the same variety when changing the ALC circuit in my FT221R.
Away to measure whether the AGC/ S-meter works
Kevin
ZL1UJG
|
602|565|2013-11-03 15:57:50|ondacorta01|Re: FT 290 Mk1 RX problem|
Hi Kevin,
keep us posted on this topic.
73,
Michele
|
603|603|2013-12-24 09:58:37|Panagiotis Perreas|Season Greetings|
Hi all!
I wish you a Merry Christmas and a Happy, Healthy and Prosperous NEW YEAR(radiowise and otherwise!)!!!
73
Panos - SV3AUW / M0LPT
|
604|603|2013-12-24 11:28:08|Fabre|Re: Season Greetings|
In return, I wish you a Merry Christmas and a Happy NEW YEAR !
Christian
De : electrichandbag@yahoogroups.com [mailto:electrichandbag@yahoogroups.com] De la part de Panagiotis Perreas
Envoyé : mardi 24 décembre 2013 08:56
À : GQRP@yahoogroups.com; BITX20@yahoogroups.com; Amateur-repairs@yahoogroups.com; G6LBQ@...; electrichandbag@yahoogroups.com; TS-520_820_530_830@yahoogroups.com; mkars80@...
Objet : [electrichandbag] Season Greetings
I wish you a Merry Christmas and a Happy, Healthy and Prosperous NEW YEAR(radiowise and otherwise!)!!!
|
605|603|2013-12-24 12:24:16|Jeremy Smith|Re: Season Greetings|
Hi,
Merry Xmas and Happy New Year to all !
Jeremy
M0XVF
------------------------------
|
606|606|2013-12-25 13:12:48|Paul Crichton|Merry Christmas and new years greetings|
To one and all my family and l wish you all a awesome Christmas and Health Wealth and Prosperity in 2014 from M0RPC Paul aka M1BPT and G3EREÂ and Stuart M3UTJ Manchester UK
|
607|607|2014-01-21 14:11:55|pencoys|FT290mk1 Service Manual ?|
Has anyone got a service manual for the 290Mk1 or even a sensible parts location diagram. With poor eyesight and no good info I'm finding the repair of my handbag a little challenging.
My known faults are... no audio, probably dead o/p IC, and CPU crashing after a few operations of any function controlled by it. Turning rig off and back on again usually either does the same again or nothing. Display is being written to until crash.
any ideas welcome.
thanks es 73 Mike G8NXD
|
608|607|2014-01-22 00:33:18|koyaanisqatsiuk|Re: FT290mk1 Service Manual ?|
Hi Mike.
Sadly even the original FT290 diagram is poor(ish) quality. It might be worth looking at Mods.dk and seeing what their downloadable copy is like.
The audio problem maybe the IC although I found them pretty good with most audio problems being electrolytics failing in the audio amp circuitry.
Sadly I can’t help with the CPU crash as I have never come across that one in many years of playing with the 290/690/790 series of rigs
Slim G4IPZ
Apologies if this goes through the system twice as it didn't seem to go anywhere first time
|
609|607|2014-01-22 00:33:30|koyaanisqatsiuk|Re: FT290mk1 Service Manual ?|
Hi Mike.
Sadly even the original FT290 diagram is poor(ish) quality. It might be worth looking at Mods.dk and seeing what their downloadable copy is like.
The audio problem maybe the IC although I found them pretty good with most audio problems being electrolytics failing in the audio amp circuitry.
Sadly I can’t help with the CPU crash as I have never come across that one in many years of playing with the 290/690/790 series of rigs
Slim G4IPZ
Sent: Tuesday, January 21, 2014 12:11 PM
Subject: [electrichandbag] FT290mk1 Service Manual ?
Has anyone got a service manual for the 290Mk1 or even a sensible parts location diagram. With poor eyesight and no good info I'm finding the repair of my handbag a little challenging.
My known faults are... no audio, probably dead o/p IC, and CPU crashing after a few operations of any function controlled by it. Turning rig off and back on again usually either does the same again or nothing. Display is being written to until crash.
any ideas welcome.
thanks es 73 Mike G8NXD
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|
610|607|2014-01-22 00:51:06|Paul Taylor|Re: FT290mk1 Service Manual ?|
Hi. CPU crashing is probably due to corrosion / poor contacts on switch S01 ( battery backup on/ off). If in off position, should be holding pins 26&27 of CPU to GND via 1k resistor.
Hope this helps
|
611|607|2014-01-22 01:06:05|Mansueto Grech|Re: FT290mk1 Service Manual ?|
Hi Mike,
Some time ago someone, sorry don't remember who, uploaded  a quite good copy of the layout and some other stuff too.
hope this is of some help
73's
Mans.9H1GB
ps If you have access to an A0 plotter you can enlarge the layout further
Good Luck
|
612|588|2014-02-02 23:02:10|zaktherabbit|Re: 290 and modern data modes?|
M0JSW -
Where is your QTH?
Im going to try and set up for WSPR over the next couple of weeks, and give it a go. If drift becomes an issue, i'll look at means of providing further cooling.
Martin
|
613|613|2014-02-15 14:13:07|peterwalker1999|Getting power into a 290R MKII|
Hi
I just purchased a pair of FT290R MKII at a very good price, as they had no accessories, including no battery pack.
As I never intend to use them portable I though this was not a problem, however I can soo no (normal) way of feeding them with 13V DC without either a battery pack or the clip on linear.
Am I missing something?
Of course I can just solder on a couple of wires to the battery terminals, and tape over all the exposed terminals, but is there a better way of connecting them up?
Peter
G0RSQ
|
614|613|2014-02-16 17:23:07|g1xgm|Re: Getting power into a 290R MKII|
There is A DC Socket on The Left hand side of The Case next to The charge socket marked EXT.
On Saturday, 15 February 2014, 12:13, "peter@..." Hi
I just purchased a pair of FT290R MKII at a very good price, as they had no accessories, including no battery pack.
As I never intend to use them portable I though this was not a problem, however I can soo no (normal) way of feeding them with 13V DC without either a battery pack or the clip on linear.
Am I missing something?
Of course I can just solder on a couple of wires to the battery terminals, and tape over all the exposed terminals, but is there a better way of connecting them up?
Peter
G0RSQ
|
615|613|2014-02-16 19:16:56|Geoff Blake|Re: Getting power into a 290R MKII|
Hi,
The Charging and power sockets you mention are part of the battery carrier. The clip-on PA has a pair of power leads. I don't think that there is any alternative to soldering to the battery carrier contacts.
Some years back I bought a replacement battery carrier from Yaesu, it was allegedly the last in the UK and no more will be imported...
Geoff
|
616|613|2014-02-16 19:53:07|Pencoys|Re: Getting power into a 290R MKII|
I have both the 290 and 790.
they both have a 5.5mm dia power socket with a 2.1mm inner ( aka 2.1mm barrel
) for external power with or without the battery. don't run it at anything
greater than 13v8 though.
the outer, barrel, is -ve and the inner 2.1mm pin is +ve.
this is located between the cover lock slider and the 2.5mm charge socket.
hth
|
617|613|2014-02-16 22:11:52|g1xgm|Re: Getting power into a 290R MKII|
Yes on Inspection I have discovered that You are correct,Coincidentally I have An FL-2025 Linear for The 290R Mk11 for sale on Ham Radio Deals £44-99 plus £12-95 Postage.
On Sunday, 16 February 2014, 17:16, Geoff Blake Hi,
The Charging and power sockets you mention are part of the battery carrier. The clip-on PA has a pair of power leads. I don't think that there is any alternative to soldering to the battery carrier contacts.
Some years back I bought a replacement battery carrier from Yaesu, it was allegedly the last in the UK and no more will be imported...
Geoff
|
618|613|2014-02-21 19:26:04|g1xgm|Re: Getting power into a 290R MKII|
Peter is buying My FL-2025 Linear.So This problem is solved.
|
619|619|2014-03-15 17:59:36|yaesufrg8800|New member|
Hi every one, I recently got myself an Sommerkamp FT290R (Yaesu)
And all I had to do was change the bulb in the front panel to a LED. It works very well indeed and has still got the original antenna attached to it.
I was rather surprised at how 2.5 watts can go so further out, more than I expected, right now I am using a roll up slimjim antenna from eBay, hanging from the ceiling with pretty good results.
I was told by some one who at one time had a Yaesu FT290R that the final power transisitor could be changed from the 2.5 watt to a 5 watt but did not go any further on that.
So right now I am looking for a 10 watt linear amp or maybe to even change the final output from the 2.5 watt to a 5 watt or even 10 watt.
I have no need to take it out any where as it is in my room on a permanent basis.
I hope to share any information to other fellow users on this little nice radio.
Mike M6YMN.
|
620|619|2014-03-17 12:13:51|ondacorta01|Re: New member|
Welcome on board Mike (and hello group) !
Changing the burned-out light bulb in my FT290R with an LED has always been on my mind, but I never did it since I never was able to source suitable LEDs; I have seen a couple of mods that suggest getting LEDs from discarded cellphones, but I have no access to them; so I wonder if someone can suggest an alternative source for suitable LEDs, and in particular part/numbers, etc. Any experience will be useful.
Thanks and 73,
Michele
|
621|619|2014-03-17 18:01:48|yaesufrg8800|Re: New member|
|
622|619|2014-03-18 12:27:37|ondacorta01|Re: New member|
Thanks !
Did you install red or white LEDs ?
Michele
|
623|619|2014-03-18 15:48:30|Mike Lee|Re: New member|
I chose the white LED's
Mike.
|
624|624|2014-04-18 00:32:16|m0icr|FT690R broken - buttons not working / keeps scanning|
Hello all,
This is my first post here so please be gentle with me! I have an old Yaesu FT690R which is giving me problems.
The good news
---------------------
- RX seems fine on all modes, tested with a friend locally and can hear him on all modes
- Main VFO knob works, VFO switch works.
- LCD works.
- Cosmetically clean inside and out.
- No apparent battery leakage inside
The bad
-------
- None of the front panel push button appear to work, only the VFO A/B switch works
- Memory does not work
- The radio starts to scan upwards when the PTT is pressed. I have tried removing the microphone and just grounding the ptt line on the mic socket just to eliminate the microphone but I get the same problem.
The scanning problem is making the radio unusable. If I quickly re-key the Mic after first release it occasionally stops scanning.
Any help gratefully received. It's a lovely radio and I would really love to get it back on the air in time for the Sporadic E's!
Kind Regards
73 de Carl M0ICR, London, UK
|
625|624|2014-04-18 17:10:34|Geoff Blake|Re: FT690R broken - buttons not working / keeps scanning|
Hi Carl, Group,
I had problems with a stuck button on a Mk 2 which caused a similar problem.Â
GeoffÂ
|
626|624|2014-04-23 13:23:58|koyaanisqatsiuk|Re: electrichandbag|
Unfortunately the push buttons on the 290, 690 and 790 can suffer some nasty problems.
The worst I have come across are if the rig has been used in a smokers household, the nicotine buildup on the tactile rubber contacts behind the buttons seems to destroy them. A strip down and a clean MAY help but it's not a certainty.
Another problem is that the push buttons can simply fall apart with age, as these rigs are getting seriously long in the tooth now sadly.
I suspect that the scanning problem can still be related to a dodgy key pad switch but I am as yet unable to give a definitive answer to that as I have a 290 which randomly goes into scan, with or without the microphone plugged in.and which has so far failed to respond to treatment.
It might be worth checking the scan mode switch inside the rig (beside the battery holder) seeing firstly what positions it's in and secondly giving it a clean with proper switch cleaner and NOT WD40 or similar.
The memory not working could be simply the back up battery having died of old age always assuming it is switched on of course.
Hope these might give you a starting point
Slim G4IPZ
|
627|627|2014-05-07 12:17:50|mkarliner|Car Cradle for Sale|
Hi,
Having a shack clearout. I have a car cradle for the 290.
I thought I'd offer it here before eBay. I'm in the UK for
postage purposes.
cheers
Mike
|
628|627|2014-05-07 17:00:11|g1xgm|Re: Car Cradle for Sale|
Please state a price £.
|
629|627|2014-05-07 19:17:43|mkarliner|Re: Car Cradle for Sale|
I'll take anything reasonable or even unreasonable plus postage, as
I just don't like throwing things out that someone
might want.
Mike
|
630|630|2014-05-29 00:37:20|nicholas pascoe|For disposal|
Hi all,
I have an FT-290 mk1 doing nothing, it works OK but the 'step' switch on front panel does not work and has been replaced with a push switch on side that does the same thing.
Also an Alinco DJ-560 dual band handy (missing the battery and antenna). It works fine with external antenna and power attached (power lead supplied).
How about £60 + £5 post for both (UK only)
|
631|631|2014-06-18 14:29:53|ian_lamb1958|FT-290 mk1 LCD Display|
The LCD display in my FT-290 mk1 has gone kaput, does anyone please know where I could obtain a replacement or is there a retrofit / mod to fit an alternative?
|
632|631|2014-06-18 14:54:19|Alexandre Veiga|Re: FT-290 mk1 LCD Display|
Hi,
I have the same problem with my FT-690.
73, Alex PY4EU
|
633|631|2014-06-20 22:10:00|koyaanisqatsiuk|Re: FT-290 mk1 LCD Display|
The chances of finding a spare WORKING display for the MK1 290/690/790 rigs is virtually zero.
When they do crop up on Ebay they're silly prices and also without any guarantee.
I have never seen any form of non-yaesu replacement because the LCD was custom made and the chip in the display multiplexer was also manufactured purely for Yaesu.
If you are sure the display is faulty (Cracked, black, etc) then sadly it's probably finished unless you can find another for spares. However the most common fault was with the display which is why I have 2 FT290s and 1 FT690 with no displays as they had failed.
HOWEVER........
one other fault occurs when the pcb that the display contacts onto bends slightly and no longer connects to the LCD 'on-glass' connector..
That can sometimes be cured by adding a thin sheet of paper/plastic etc behind the other side of the PCB to press the board firmer onto the display.
The simplest way to check is to press on the display while the rig is powered up and see if a blank screen starts to display the normal onscreen info. If it does then your PCB has bowed slightly and the pressure trick might work.
Slim G4IPZ
|
634|631|2014-06-21 03:01:00|Hector Pascal|Re: FT-290 mk1 LCD Display|
I've always understood that the displays themselves rarely "fail". Â Failure of the associated electronics, cracking the glass and other mechanical damage are the most likely "real" failure modes.
There have been many reports that blank LCD displays can often be repaired by dismantling them, and very carefully cleaning the glass/conductive rubber contact points.
Can anyone who has actually and personally done this on these transceivers, provide a quick explanation of how to do it without damage? Â
|
635|635|2014-07-09 11:17:34|gi0gdp|Mk1 Synthesizer step jump|
Has anyone seen this in an 30 year old 290 MK1, whilst tuning say from 144.290 to 144.297 all is OK
step wise and then suddenly it jumps either 2 or 3 KHz to say 144.300 thenis OK til about 144.350 and then
does it again. I havent had the time to note the exact multiples that it happens on as that can be done later
Needles to say a station on ssb at just under the calling frequency is almost impossible to resolve
another interesting 290 problem.............
regards
Geoff
|
636|635|2014-07-09 12:28:54|Hector Pascal|Re: Mk1 Synthesizer step jump|
Geoff,
FWIW, I had a similar problem on my MK 1 790 about 20 years ago.
The cause was a "stuck" output digit on the CPU's built in digital to analog converter, that controls the analog frequency. Â This caused the steps to mis-count up and down, best "heard" by tuning a CW carrier on SSB, and listening to the audio change as you rotate the dial. Â The mis-stepping is then apparent from the changes in audio tone.
Hopefully this is not the case with yours, because I had to replace the CPU. Not a soldering task for the inexperienced, even assuming you can still get the ic nowadays. Â (But the whole board may well still be available.) Â
David, VK6JT
|
637|631|2014-07-09 16:31:05|koyaanisqatsiuk|Re: FT-290 mk1 LCD Display|
Hi David.
My comments were borne from long experience repairing many 290/690/790 mark 1 models whilst still a repair engineer about 20 years ago and the odd one or two since then.
Stripping down and attempting to clean the display contacts is NOT a job I would recommend for those who do not possess a fair degree of technical and electronics skill and ability. The internal wiring of these rigs does not like too much manipulation and the resultant wire joint breakages were a pain.
The mere dis-assembly of these rigs is fraught with potential problems. For those who wish to try it the info can be sourced (or at least could) by Googling for the info or going to Mods.dk and downloading the assorted info there.
Whilst the fading display problem may be due to poor conductive rubber contacts to the glass of the display, over-vigorous cleaning of the contacts on the LCD will ruin it anyway. Most problems I found that were contact based were as I mentioned before: a slight bowing of the display PCB resulting in poor contact pressure. I said how that could be tried and dealt with previously.
Also NEVER try using WD40 to clean the display/PCB contacts. It penetrates into the poor quality SRPB board that Yaesu used and can leave a resistive connection between the contacts making matters worse rather than better.
Despite what you may have heard David, the early LCDs did indeed fail quite commonly. They either went totally black or would fail to darken at all when the display data was fed to them. As I understood it, this was due to bonding failure between the two component parts of the glass sandwich that made up the display, a problem generally inherent in early LCD technology. The problems caused by bad connections only tended to occur on very old rigs as everything simply aged.
The multiplexing IC use to drive the display was a special (Matsushita) device and finding information on them proved almost impossible. Even when I did, it proved to be of no help as the display multiplexing was not straight forward and was dependent on the data chain from the main rig control CPU IC and a clock generated on it too.
I have latterly been aware of some people experimenting with PIC based replacements but as it was impossible to squeeze a replacement display into the existing 'hole', as I understand it their experimentation stopped.
I played around with developing an external display based on an Arduino mini with a 2 line LCD display but again, due to the add-on nature of the possible repair looking like an awful bodge of an extra box on the top of the case, I decided to stop.
73
Slim G4IPZ
|
638|635|2014-07-09 16:31:19|koyaanisqatsiuk|Re: Mk1 Synthesizer step jump|
Hi David.
Thanks for posting that one as I've not come across that - yet!
I suspect as these great, old rigs start to age even more, the even weirder faults will start appearing.
I've added it to my FT290 check list for future reference.
73 Dale (Slim) Haines G4IPZ
|
639|635|2014-07-09 16:32:08|koyaanisqatsiuk|Re: Mk1 Synthesizer step jump|
My immediate suspicion would fall on the rotary encoder perhaps being worn or simply dirty.
What happens if you tune using the up/down buttons on the microphone?
If the problem is still there using the buttons then that would eliminate the rotary encoder but open a whole new can of nasty worms pointing, probably within the digital circuitry.
If the problem isn't there with the buttons then perhaps a (long winded and tricky) strip down and clean of the encoder mechanism and innards may be looming.
You may find that simply squirting a small (SMALL!) amount of switch cleaner in through the hole where the click-stop ball bearing sits and then rotating the encoder several times may affect a cure. If not then it's back to a strip down.
A good, proper alcohol based switch cleaner is best but not one with old fashioned carbon-tetrachloride since that could possibly dissolve the plastic portions of the encoder
Don't whatever you do, use anything like WD40 or AC30 cleaners as they can spell death to encoders as they attract dust.
Slim G4IPZ
|
640|631|2014-07-09 17:59:47|Hector Pascal|Re: FT-290 mk1 LCD Display|
Many thanks for sharing your experience, Slim. Â My Mk1 290 and 690 are still limping along quite well, but the 290 has a tendency to intermittently stop working on receive when on USB. Â Dead silence - not even any hiss! Â Switching to LSB, and then back to USB usually brings it back. Â I have long suspected a low activity crystal may be the cause, but as soon as I poke around it all starts working again!. Â Is this a common, or even a known fault?
Regards,
David, Â VK6JTÂ
|
641|635|2014-07-10 17:49:06|gi0gdp|Re: Mk1 Synthesizer step jump|
Thanks for the reply David and Slim
Just tried the up down buttons with the same result
Sounds like a "stuck bit".
Will have a think about the way forward after some tea and biscuits!
thanks
Geoff
|
642|635|2014-07-10 18:54:08|Hector Pascal|Re: Mk1 Synthesizer step jump|
Geoff,
You can monitor the CPU bits with a DVM, but take care to avoid static voltages.
The DAC is a simple "resistor adding" type, and you can easily work out the conversion scheme.  I seem to remember it is a simple 4 bit binary weighted type.  I also seem to remember that some CPU inputs are quite vulnerable because the are easily accessed from the mike socket.  Sorry to be a bit vague, but my problem did occur 25 years ago!
I would definitely try to rule out any other causes first, because the CPU is a Yaesu custom ic, and probably now rarer than hen's teeth!
David
VK6JT
|
643|631|2014-07-10 22:04:44|koyaanisqatsiuk|Re: FT-290 mk1 LCD Display|
Hi again.
I have read of people apparently suffering with low activity and sluggish carrier oscillator crystals in the 290 but again it's not a fault I've come across.
I've also seen postings where people are looking to have a one-off crystal made but of course the costs are astronomic now.
As it happens I've just finished writing to Harry Leeming G3LLL to keep him posted on an odd fault on one of my 290s.
It started with the normal AGC fault needing the cure of an additional 47K resistor strapped between the base and emitter of Q1014.
Then a couple of years on, the fault recurred and strangely simply changing the 47K resistor once more cured it.
Yet again a year or so after that, once again I got the AGC problem. I checked the resistor and it was still 47K but remembering the previous time, I changed it once more. Lo and behold everything was back to normal and has been for the past 6 months.
I've mentioned a suggestion to Harry to get his views on it in light of his discovery some years back that occasionally simply spraying the PCB with switch cleaner cured the fault for a few weeks.
I am wondering if the rather nasty PCB material used in the 290/690/790 is absorbing a degree of moisture from the atmosphere and both using switch cleaner or, in my case, heating the board with the soldering iron, simply evaporates the miniscule amounts of water concerned.
Just a guess and I'll wait and see if the fault recurs before carrying out a few little experiments.
73
Dale (Slim) Haines
|
644|631|2014-07-10 22:05:43|Nick Tsakonas|Re: FT-290 mk1 LCD Display|
Hi,
although not answering directly to your question, as I have bought a lot of used rigs from ebay the last few years - including the whole FT-x90-R2 series which at the moment work fine.It is sometimes mandatory to unscrew your rig and inspect it with a magnifying glass for loose connections, broken solders, leaking capacitors, something that can be seen with naked eye. Most of the times, doing so early enough can prolong your rig life and maybe most of the issues are due to this kind of minor details.
due to their age, I expect failures in the solders or corrosion at some points or dried out capacitors so I always inspect them to see their status.Also, although not always possible, I read the schematics for critical parts and keep my eyes open on ebay in advance for parts or boards from other cannibalized rigs and buy them if possible for future repairs.I have a box with rare to find boards for my HF rigs, and some PLL chips for the FT-x90 series - just in case!
Maybe there is no LCD at the moment, but surely some day a spare will popup on ebay.Keep your eyes in there, put a saved search to get daily emails.I have used this method for the last couple of years and I have found almost all parts of my rigs passing by - of course I do not buy everything!
73,
Nick, SV1DJG
From: "Hector Pascal hector.pascal@... [electrichandbag]" Sent: Wednesday, July 9, 2014 4:59 PM
Subject: Re: [electrichandbag] FT-290 mk1 LCD Display
Many thanks for sharing your experience, Slim. My Mk1 290 and 690 are still limping along quite well, but the 290 has a tendency to intermittently stop working on receive when on USB. Dead silence - not even any hiss! Switching to LSB, and then back to USB usually brings it back. I have long suspected a low activity crystal may be the cause, but as soon as I poke around it all starts working again!. Is this a common, or even a known fault?
Regards,
David, VK6JT
|
645|635|2014-07-10 22:10:29|koyaanisqatsiuk|Re: Mk1 Synthesizer step jump|
Thats not good news.
I suppose it may be worth going round the IC pins checking for dry joints holding a pin high or low.
I'm not near my workshop so I can't look at the diagram to make any better suggestions.
Slim
|
646|631|2014-07-11 02:16:07|Hector Pascal|Re: FT-290 mk1 LCD Display|
G'day Slim,
I have a note on my "to do" list to investigate my crystal fault, but it's a very long list, and the temporary fix is so easy!
That's a very interesting ALC fault, and to me sounds far more like a problem in Q1014? Â But with your experience I guess you eliminated that early on. Â Another thing that I would have looked for very hard is a leaky ceramic capacitor on the ALC line. Â But again, I bow to your own and Harry's experience. Â However, it's interesting to note that aerosol switch cleaner also has a chilling effect when it evaporates, so the fault may still turn out to be temperature related.
I'd be surprised if there would be enough board leakage to affect operation unless there are some very high impedances involved, but I will need to review the circuitry to be explore that possibility. Â Another question is why would this leakage effect only show up in this one area of the board. Â Next time the fault occurs, I think a hair drier on the ALC components is called for!
It will be fascinating to know the resolution of this. Please publish it here.
BTW, I don't recollect ever seeing details of this "normal ALC fault". Could you outline the effects to watch for?
Regards
David, VK6JT
|
647|631|2014-07-11 14:49:08|g4sra|Re: FT-290 mk1 ALC Fault|
I have two FT-290 mk1's that exhibit this fault.
When the rig is first turned on the S-Meter end-stops, indicating a high
AGC voltage. When keyed up, the S-Meter drops to zero and power output
is in milliwatts, indicating a high ALC voltage.
If you experience *both* these conditions, it is not the Q1014 FET.
The ALC voltage is derived before the FET, the resistor fix only treats
the symptoms in this case and is not a proper cure.
The fault is temperature sensitive, any of a hot-air gun, soldering iron
tip, or aerosol can spray (compressed air) change it's characteristics.
If the rig's are operated (left switched on) regularly for a reasonable
length of time (hours) , the effects of the fault diminish, regardless
of ambient temperature.
This feels to me to be most like an ageing electrolytic. This is a known
issue with the FT290R MK1's
Due to the very high impedances involved, putting a scope probe anywhere
near the issue changes it, this is truly a Quantum Physics problem
(observing it changes the outcome).
Where I am going to look next...
Circuitry that is common to both AGC\ALC is the TX\RX delay switching
section that ensures that the rig has truly 'switched' before allowing
the rig to either listen or transmit. It does this by controlling the
the AGC\ALC voltage. This I assume is there to stop one's own RF being
blasted into one's own receiver front end whilst still active.
I will be investigating this section next when I get the time unless
someone here posts the fix first (he types hopefully).
On 11/07/14 01:16, Hector Pascal
hector.pascal@... [electrichandbag] wrote:
..........
|
648|631|2014-07-11 23:10:16|koyaanisqatsiuk|Re: FT-290 mk1 LCD Display|
Hi David.
It's strange that you've not come across the agc fault. Maybe it's the climate in VK land HI.
The problem is this.
On switch on the S meter slams hard against the right hand side or, in some cases floats to mid-scale and stays there. There is no sound on SSB and occasionally there might be a low level hiss on FM.
Simply leaving the rig running for a while (often as long as 30 minutes) will see the meter drift back to zero and the rig slowly start working normally which it will continue to do until the rig is turned off, even for the briefest moment, after which the restart period begins again on switch on.
(There is some previous info on the resistor mod in the group files entitled AGC FAULT MODS.)
Googling the fault will present quite a load of info on this fault.
The immediate suspect is always Q1014 however changing it (even with a correct 2SC2603E) will often make no difference or, even if it does, the fault may reappear within a few days (or weeks if you're lucky)
The circuit around Q1014 is quite odd in as far as the base of Q1014 simply 'floats' with no DC path to anywhere.
Suspicion also falls on D28, 29 & 30 but changing them may, again prove only temporary.
Harry was a Yaesu dealer back in the days of the 290's emergence and has stated that when he approached Yaesu abouth this problem, they had no cure but stated that if this 'bodge' worked then they were happy for it to be done!
The 'bodge' is quite simply a 47K resistor between the base of Q1014 and chassis and it works again. (see group files)
However...........
I have now come across just one FT290 (luckily one of my own) where this mod worked but after a year or so (seriously) the fault recurred.
Removing the 47K resistor and replacing it with another 47K resistor bizarrely cleared the fault but even stranger, about 2 years later it recurred once again.
The replacement of the 47K resistor once more cleared the fault and, at present the rig works perfectly again.
The joy of elderly rigs
Slim G4IPZ
|
649|631|2014-07-12 00:53:04|Hector Pascal|Re: FT-290 mk1 LCD Display|
Thanks for that, Slim.
"floating base"?? Â It must get it's bias from somewhere! Â I think all this sounds like something interesting to look into.
Yes, I know Harry's reputation well, (and yours also to some extent!) - I was G8LRE for many years, and G0KXR briefly, before moving to VK. Â Prior to that I was an Engineer with BBC Transmission in London for ~20 years.
My FTx90's were bought in the UK, so in retrospect, I too am surprised I've never seen this fault. Â (My fingers are now looking for something wooden to touch!)
.
Regards  David,
VK6JTÂ
|
650|650|2014-08-04 19:09:38|ian_lamb1958|FT290 mk2 Mic Gain|
Does anyone know which pot the SSB mic gain setting is on an FT290 mk2 please?
|
651|650|2014-08-05 13:08:49|g3vvt|Re: FT290 mk2 Mic Gain|
Hi Ian,
The FT290 mk2 SSB mic gain pot in the Technical Supplement TX alignment instructions appears to be VR3004 on the main unit. There will also be some interaction with the ALC pot in the setting which appears to be VR3007.
The FM deviation pot is VR3005 on the main unit.
Both the FT290 mk2 Instruction Book and the Technical Supplement are available for download from Mods DK if my memory is correct.
Regards,
Bob, G3VVT
|
652|652|2014-08-18 23:56:39|g4joeuk|FT290 Mk 11|
Hi, I am in need of the battery pack for the Mark 2 FT290.
Can anyone help?
Joe
|
653|653|2014-09-09 21:07:17|p.larner|mk1 290 poor rx audio on fm|
Hi all,thought i would share this cure i had for one of these with realy bad rx audio,itmay save someone some time.I had this mk1 290 given to me a few weeks ago with rx audio issues mainly on fm,it was all muffeled and distorted,ssb wasnt 100% but better by far than fm.I started by checking the esr on all the caps by the audio ic,most were reading over 10 ohms!,i replaced all of them and tried it againe,it was about 50% beter but still poorly!,my next job was to separate the 2 metal posts near mc3357p,i took the audio from the pin(basicaly pin 9 of the ic)into another amp,the audio from that was pretty clear,i forgot to add that if the volume on the rig was turned down realy low it wasnt half so bad!,i traced the audio path with the other amp suspecting q 1025 or 26 to be bad but they were fine,the audio was good right up to q1027 the audio ic,i had already checked the vcc to this and was seeing about 8v,i saw its fed via a 2.2ohm resistor,i downloaded the data sheet for the ic and its vcc was supposed to be 12v!,just out of interest i measured the vcc under load when the audio began to fall apart,it dropped to about 3v!,i suspected a bad audio amp,i thought well shit or bust and ran a feed from the 12v rail to pin 6 of the ic and bingo clear audio!,i decided to remove r 122 for a closer look,as soon as i touched it it fell apart!,must of been well cooked!,why they use a quater watt resistor on an amp that can put out 1 watt is beyond me!,i assume its going to be class ab amplification so what about 30-40% efficient,no wonder it was cooked,well i hope that can be of help to someone,next job is to reallign it and it should be good,ps,thanks for having me in the group,73 Paul m3vuv.
|
654|653|2014-09-14 02:12:33|p.larner|Re: mk1 290 poor rx audio on fm|
well thought id give an update on this 290 mk1,i trie doing a realignment but no joy at all,still terible audio and a few of the adjustments did nothing at all,once againe i started checking the capacitor esr readings,most were bad,so far ive changed 24 caps!,that at least got some of the adjustments on various trimmers etc actualy doing something but no matter what i did i couldnt get the audio anywhere near on ssb,the previous owner of the radio later told me ssb went south a few years ago and he just used it on fm untill that buggered up as well,he brought the radio new in 1985,anyway back to the repair.i was realy scratching my head with this thing,i was looking around it with the sig gen and scope and noticed the signal on the if was looking good until it got to xf 02 the 10.81 mhz filter,i decided to remove it and bridge the input and output to it so the signals go strait to d09,doing this actualy got decent ssb audio out of the rig,i expect the selectivity has dropped a tad tho lol,ive cut open the filter and its an 8 pole job using 4x 2 pole xtal filters,for anyone doing this it has only two capacitors inside between the center 2 xtal filters,ive only managed to get a measurment off of one of these,it was 47pf,ive managed to get rid of all the potting compound with carefull use of a blowtorch and screwdriver,i desoldered the cans off of all 4 xtals to have a look for any detached contacts or cracked quartz but they all look fine,im in the process of rebuilding it on a small piece of veroboard with new caps,fingers crossed it was a bad cap?i may take some pics and post,it will be realy nice to get this working as its one owner and cosmeticley its like new,its a shame it uses this if as ive a couple of dead kenwood 2m ssb radios and was planning to use the filters from one of those,hence the need to do this job,if i can get the ssb sorted its onto refiting q14 and trying to sort the common agc issues out,will keep you all posted 73 m3-vuv Paul.
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655|653|2014-09-14 03:04:40|p.larner|Re: mk1 290 poor rx audio on fm|
oops,meant to say the filter contains 3 caps not 2 !
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656|653|2014-09-14 15:38:58|g3vvt|Re: mk1 290 poor rx audio on fm|
Hi Paul,
The filter you mention XF1002 is in the SSB/CW path only.
Just why are you working on an SSB filter for FM audio if the posting of "mk1 290 poor rx audio on FM" is correct?
Is always as well to study the block diagram when this is available to find out the signal paths.
From the RX 10.8MHz IF the signal splits into two directions with FM passing through Q1019 an MC3357P IF/DET/SQ chip and SSB/CW passing through XF1002. They do not meet up again until you get to the audio stages.
In any servicing work you have to be systematic in approach. What is the effect and in a multimode radio what exactly is affected?
If in the audio stages an audio generator usually set at 1kHz together with an oscilloscope can check that part of the system out. An RF signal generator set at usually +/-1.5kHz FM deviation on a selected channel frequency can have beneficial effects in breaking down the cause of RX FM distortion in the RF/IF and discriminator/detector paths. Can be that the FM discriminator is misaligned. See page 38 of the user manual of how to check and correct this.
Another possibility is that the radio is off frequency which is a more common problem. Check that the radio is on frequency with an accurate counter or Communications Service monitor on a given frequency on TX. Check the details on page 44 for TX alignment, but usually a slight adjustment of L3007 in the VCO section can have beneficial results!
With the work done on the SSB filter this may be terminally damaged and may need a replacement from a scrap radio. You can check the RX IF response using such as a suitable noise generator and the Spectrogram program on your PC using the sound card as detailed on the Elecraft web site to check the filter. I used this when aligning my Elecraft K2 and have found it useful for other purposes. An alternative would be to use a spectrum analyzer and tracking generator into the filter with suitable impedance matching added to the filter or use a sweep generator with an oscilloscope + RF detector as another alternative. Most amateurs would not have access to this type of equipment so the Elecraft method can be somewhat easier.
All of the above can depend on what accurate test equipment you have access to as without that can become somewhat more difficult.
Regards,
Bob, G3VVT (Eng Tech, MIET)
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657|653|2014-09-14 15:57:51|p.larner|Re: mk1 290 poor rx audio on fm|
Hi,thanks for the advice,im sure i mentioned it but the fm audio is sorted,im now trying to sort the audio out on ssb,its terrible on lsb and usb,as i said bypasing the filter cleans it up no end so im assuming thats where the issue is?,73 paul m3vuv
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658|658|2014-09-15 12:19:48|g3vvt|Re: mk1 290 poor rx audio on SSB|
Hi Paul,
In that case yes, the filter XF1002 is one of the suspects as are the SSB carrier frequencies for LSB and USB. In addition it depends how you are monitoring the SSB signal.
What do you use as a monitor?
The details how to set up the carrier frequencies are there on page 44 in the user instruction manual. However, this does not enable you to see the effect of the SSB filter without other test equipment. As mentioned running the Spectrogram programme in your PC + sound card together with a suitable noise generator with the radio on RX can open up things so you can see what is wrong. I had to put an audio transformer in the PC sound card audio input to isolate the effects of the PC power supply, but other than that worked like a charm.
Check the information/feedback side on the Elecraft web site for more information:
www.elecraft.com (assuming the information is still there of course). Failing that one of the links from the Elecraft site should help.
Regards,
Bob, G3VVT
In a message dated 15/09/2014 09:41:09 GMT Daylight Time, Paul, M3VUV writes:
|
659|658|2014-09-15 17:26:30|p.larner|Re: mk1 290 poor rx audio on SSB|
cheers bob,i will look into that,test gear wise i was using a scope sig gen and a 1.3ghz hitachi frequency counter,the only thing i havent been able to check very well is the first if alignment (t1005-t1006-t1014 as i dont have a sweep gen,ive just monitored another ssb transceivers transmision and peaked them for max sig on the scope and noise from the speaker,ive moved the cores all ways but it doesent make ant differance to the clarity of the audio only signal strenth,the only other thing i cant get on spec is the vcv line adjustment,the max i get is about 2.3 volts max,im not sure what vcv means,im asuming its some american term?,when the filter was in the board the audio was very sort of scratchy and sort of distorted,almost as if the speaker voice coil was fouling on the magnet,without the filter its about 90% better,i dont know how to test the 2 pole monolythic xtal filters,at least without a spectrum analyse and sweep gen,i dont know if its possible to build an oscillator as you would for a normal xtal and use the frequency counter to see what frequency there on,ie,use the center pin and then each outer pin,ive been trying to find info on the net but no joy as yet,ive got a hunch its a bad cap in the filter,or at least i hope its that,if not im running out of ideas,i had a hp spec analyser that i sold about 2yrs ago,wishing i kept it now!.73 Paul m3-vuv.
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660|658|2014-09-15 18:06:36|kkyahoo|Re: mk1 290 poor rx audio on SSB|

VCV usually means varactor control voltage. It's the synth tuning voltage for the vfo.
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661|658|2014-09-17 17:45:23|p.larner|Re: mk1 290 poor rx audio on SSB|
well i got the filter rebuilt with new caps and realigned the rig and hey presto,ive now got decent audio on ssb!,ive now got to replace q14,or rather fit one,the only thing im struggling with is the pcb around where q 14 fits,when the transistor was removed some of the tracks lifted,theres a pin with a white with a mauve trace coming from it and i cant seem to make sense of the schematic for this,would anyone have a pic of the board around this area so i can repair the tracks?,ive looked on here but the pics stop just short of where i need,cheers Paul m3-vuv.
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662|662|2014-09-28 20:54:55|ve2ebp|Radio dead after inverting power polarity|
Hi guys, I loved that radio! I can't believe I've been long enough a ham to know better but did the same mistake: no fuse!
I used a 'standard' wall wart of 12 VDC but back then, Yaesu wasn't following today's standards...
I'm sure I'm not the only one to whom it happened. Has anybody successfully repair their rig after doing the same mistake?
This is really sad.
Thanks in advance guys.
Pete, VE2HS
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663|663|2014-09-28 20:56:02|ve2ebp|Service manual|
I noticed that the service manual is not in the files section nor can it be found on mods.dk.
Is there a way to still get a copy of it somewhere ?
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664|663|2014-09-29 01:10:24|Hector Pascal|Re: Service manual|
To the best of my knowledge, there never was a Yaesu Service Manual for the Mark1. And I've never seen one for the Mark 2 either.
Anybody know different?
The circuit diagram, pcb layout, and some short-form alignment procedures are in the Operating Manuals, which are available on line.
Regards,
David
VK6JT
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665|663|2014-09-29 01:41:05|ve2ebp|Re: Service manual|
Thank you very much David
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666|663|2014-09-29 06:42:04|Mansueto Grech|Re: Service manual|
Hi David,
A workshop manual does exist for the mk2 but the copy I came across was not complete and of bad quality. Should have a copy somewhere if interested. No service or workshop manual was ever issued as far as I know.
73's
Mans 9H1GB
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667|663|2014-09-29 08:28:21|kkyahoo|Re: Service manual|

There is a technical supplement for the mk2. Covers alignment, schematics etc. I have the pdf if that helps.
Kevin
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668|663|2014-09-29 08:44:33|Mansueto Grech|Re: Service manual|
Hi Kevin,
Can I have a copy as mine is not a good copy especially the layout and not the full document.
Thanks
Mans. 9h1GB
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669|663|2014-09-29 11:54:19|Wayne - VK5APN|Re: Service manual|
Hi
Is this for the 790RMK11 or the 290RMK11
Looking for the 790RMK11 if anyone has one, also interested in the 290RKM11
Cheers and
Regards
Wayne
VK5APN
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670|663|2014-09-30 07:32:31|Hector Pascal|Re: Service manual|
There is some FT290 (MK1 & 2) information on KO4BB's excellent free site:
David,
VK6JT
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671|671|2014-10-06 14:54:33|koyaanisqatsiuk|A 290 fault thats new on me. Any ideas?|
I thought I'd come across most 290 faults over the years but today I came across a new one which, before I dive in with my big heavy boots, I thought I'd throw it to the group.
The owner of this FT 290 told me that he had been having the normal long start up problem (AGC) fault which had now got annoyingly long. He'd heard about the resistor mod and asked if I'd do it so I said yes as he's an old mate.
However a couple of weeks later when he finally brought the thing to me, he told me that it now has a different fault and it's one I've not seen before.
On turning the power on, the S meter is almost but not quite hard over to the right. However the receive side has the normal noise levels for whatever mode is selected.
The PTT does nothing though and the LCD display is stuck on 5.000.0
Rotating the tuning does nothing and none of the push buttons are working either.
The volume and squelch controls work as does the mode change switch.
When using another rig tuned to 145.000 MHz and transmitting in any mode and selecting the relevant mode on the faulty rig it receives apparently perfectly.
It almost looks as if it's locked up partway through a cpu reset.
The back up battery is good and I have tried another reset a couple of times with no success.
Apparently he'd left the rig running on batteries and he came back to find this situation.
So any ideas out there?
Slim Haines
|
672|671|2014-10-06 15:02:43|g4sra|Re: A 290 fault thats new on me. Any ideas?|
On 03/10/14 16:59,
special@... [electrichandbag] wrote:
Check to see if TX is disabled because the PLL is out of lock (it often
is on rigs). If so, that may give you a starting point.
|
673|671|2014-10-06 15:04:26|martin.barfield|Re: A 290 fault thats new on me. Any ideas?|
Hmmm, odd one. Like you say, sounds like the CPU isnt starting up properly. Check the clock crystal is running properly, that would be my first thought.
It certainly sounds like a CPU/controller problem
Martin G7MRV
|
674|671|2014-10-06 16:31:10|koyaanisqatsiuk|Re: A 290 fault thats new on me. Any ideas?|
Here's a quick update.
It appears that this fault goes away when the rig is left unused for 24 hours or so.
Then, on switch on everything works : tuning, push buttons etc until the moment you hit the PTT, whereupon the rig goes back into displaying 5.000.0, no buttons work but it still receives on all modes on that frequency.
Leave it off for another 24 hours and it repeats the working not working cycle.
As long as the weather warms back up a bit I'll get into the workshop in a day or so and start checking a bit more.
The thing that throws me most is that the rig still works on all modes on receive and works absolutely perfectly.
Watch this space as they say
Slim Haines
|
675|671|2014-10-06 16:36:10|Mansueto Grech|Re: A 290 fault thats new on me. Any ideas?|
Hi Slim,
Check the backup battery and maybe do a reset too.
GL
Mans 9H1GB
|
676|671|2014-10-06 17:08:51|koyaanisqatsiuk|Re: A 290 fault thats new on me. Any ideas?|
Hi Mans.
The back up battery tests at just over 3V and I've tried several (what I believe to be the reset routine) resets with no luck.
It almost looks like it's doing a partial reset while in operation as it hangs up showing 5.000.0 which as I understand it is the reset default frequency.
I have never needed to carry out a reset on an FT 290 before but always believed that it was a case of grounding pin 4 of CN003 the connector between the keyboard and control PCBs. This appears to do nothing and i have tried it several times.
Slim
|
677|671|2014-10-06 19:57:53|Mansueto Grech|Re: A 290 fault thats new on me. Any ideas?|
Hi Slim,
Thanks for the update. May O,suggest you remove the battery and leave it unconnected for an hour or so. Power must also be off.
GL
Mans 9H1GB
|
678|671|2014-10-06 20:50:07|koyaanisqatsiuk|Re: A 290 fault thats new on me. Any ideas?|
Hi again Mans.
That too has been done.
I have disconnected all power and turned off the backup battery and left the rig switched on to drain any remaining power.
This has been done with it left untouched for 24 hours.
Then with power reconnected, on switch on the rig will then work normally for a very short time (a matter of a couple of minutes maximum) but the moment you operate it or press the PTT the display goes back to 5.000.0 and all controls cease to function again.
Certainly a weird fault.
Slim
|
679|679|2014-10-09 18:53:35|g3xwh|FT-290 MK1 no RX or TX after several years of no use|
I last used my FT-290R over ten years ago and it was working OK. Switched it on this week and all seemed well with 'white' noise on both FM and SSB modes but although it switched to TX there is no output signal and also no receive signal (tested with another FM rig on the same frequency nearby) S meter remains at zero.
Would welcome suggestions as to probably causes of such faults after a long period of non use.
Thanks,
Richard G3XWH
|
680|592|2014-10-11 01:16:02|fastflyer99|Re: FT-290R with FM problem|
Hi everyone, I know this is an old post, but I just thought I'd leave a comment as I had exactly the same issue on an FT290R I bought recently. I also traced the fault to T1013, but I wondered why this component had failed. In my experience of working on radio equipment, they are usually extremely reliable and in the years I've worked on this kind of kit, professionally or for leisure, I can't remember having changed one. Here, the problem - on mine at least - was almost certainly down to failing electrolytics. Right next to this inductor is a 10uf 16V capacitor, C104. On my rig, a capacitor test with an ESR meter showed nearly all of the capacitors of this value to be in poor shape, one with clear evidence of venting that I could see. I run an electronics workshop for my daytime job and I see a lot of failed or failing electroytics, and quite often there is no visible discharge, but nearby components are tarnished from a gaseous emission. In my FT290R (and no doubt in other rigs with ageing parts), the symptoms of audio loss were much as described in this thread. What was happening, was the adjacent capacitor had emitted some nastiness which had (at the very least) affected the internal capacitor which sits in the base of T1013, and caused it to misbehave once current was applied to it - hence the change of resonant frequency of T1013 and consequent loss of audio. I went on to change all the 10uf caps in the rig, and then all the other electrolytics since I was at it (some weren't in great shape) with 105C ones - it now has a good as new feel :) I just thought I'd add this for interest, and also to point out that as in many rigs of this age, failing caps are a now a major cause of ills, and well worth checking. This can be done in circuit with a good ESR meter. Incidentally, I did the same with my ailing FT225RD, and ended up with a back to spec and very nice to use rig. 73, Mark Wheeler G6DOD
|
681|592|2014-10-11 01:23:24|fastflyer99|Re: FT-290R with FM problem|
Something I forgot to say - I found some 455kHz IFTs I'd ordered from eBay a couple of years ago, and although bigger than the original T1013 coil, I managed to fit one into the same holes with a little bending of the pins. The rig works perfectly and now the audio is full and clean, with the squelch now behaving fine.
|
682|592|2014-10-11 11:57:28|kkyahoo|Re: FT-290R with FM problem|

Mark,
What ESR meter did you use? What would be a bad vs good reading on ESR?
73
Kevin
|
683|592|2014-10-12 01:29:29|fastflyer99|Re: FT-290R with FM problem|
Hi Kevin
It's an EVB ESR meter, which I believe was originally supplied by Dick Smith in Australia as a kit. There's a guy in Portugal who sells them ready built - you should be able to find him on Google if you search for EVB ESR meters. There's a graph on the front of the meter of ideal values for different capacitors, and with 10uf 16V ones as fitted in FT290Rs, you shouldn't expect to see anything much over 2 ohms. Some of mine measured 35....... Failing that, go for an Atlas one :)
73,
Mark
G6DOD
|
684|592|2014-10-12 10:38:49|kkyahoo|Re: FT-290R with FM problem|

Mark,
Thanks, got the Atlas one which measures C as well. Surprising how many caps were faulty in my FRG8800, esp in the power supply.
Cheers
Kevin
|
685|592|2014-10-12 18:19:23|iw5bsf83|Re: FT-290R with FM problem|
|
686|592|2014-10-12 23:13:34|fastflyer99|Re: FT-290R with FM problem|
Ciao Roberto, e grazie! Mark
|
687|592|2014-10-12 23:16:16|fastflyer99|Re: FT-290R with FM problem|
Yep, prime candidates for failure :)
|
688|193|2014-10-18 12:57:57|jkf1000|Battery Box|
I have just finished repairing and realigning a FT690 Mk2 I recently purchased, but the unit did not come with the origional battery box, is there anyone out there with one for sale or even the 6mtr clip on PA unit just to finish the job, many thanks in advance Karl, M0KRL
|
689|679|2014-10-20 10:53:07|g3xwh|Re: FT-290 MK1 no RX or TX after several years of no use|
It now looks as if the source of the problem is the PLL XTAL 18.7414MHz, if anyone knows of one for sale I would be grateful.
73,
Richard G3XWH
|
690|690|2014-10-22 16:43:24|fastflyer99|FT290 switches|
Hi all
I recently bought another FT290R from eBay. It's not in great shape, although I was fortunate enough to find a Mutek pre-amp in it which is now installed in my other rig :) I'd like to get this one going though, but the previous owner had obviously used it in a very gritty environment, and the pushbutton switches are sadly damaged beyond repair.
Does anyone know where these might be available (they were made by Alps), or perhaps someone has the complete PCB with a serviceable set of switches - it would be appreciated if you could let me know if you have one that you are prepared to part with.
Thanks,
Mark Wheeler
G6DOD
|
691|691|2014-10-30 23:46:35|rtufty|FT290 low power TX +smeter and squelch problem.|
Hi,
I've got a problem with my FT290v1 Symptoms:
On RX the smeter goes hard to the right.
The squelch used to be at about the 10o'clock position, is now at about the 3o'clock position.
I can no longer open my local repeater, but I can hear it fine at the right frequency, and tuning another HT to the repeater input frequency hears the FT290 sending a tone.
Possible cause: my 3 year old nephew getting at the radio and twiddling every knob and pressing every button in sight while it had no antenna connected (or pulled out, maybe fortunately!)
Any ideas?
Thanks.
Bill
|
692|691|2014-10-31 00:42:21|g4sra|Re: FT290 low power TX +smeter and squelch problem.|
On 30/10/14 21:31,
mail@... [electrichandbag] wrote:
If it also stays to the left on TX (mW out instead of 3W) you most
likely have the ALC\AGC fault.
On the bright side, if you have the ALC\AGC fault it will have reduced
the stress your power transistor.
|
693|691|2014-10-31 00:55:02|g4sra|Re: FT290 low power TX +smeter and squelch problem.|
Forgot to say.....
Leave the rig powered up (dummy loaded) for three days and then check
it. The meter reading may drop and the RX\TX work normally again until
you power it off for a couple of hours.
Mine now 'warms up' in under ten minutes with regular use (which is the
reason I have never managed to fix it, I am too slow).
|
694|691|2014-11-01 12:14:48|g3vvt|Re: FT290 low power TX +smeter and squelch problem.|
Hi Bill,
I believe what you describe is a classic description of a problem on the FT290R series 1 detailed by Harry Leeming, G3LLL in his column in Practical Wireless quite a number of years back. Harry was a retailer in Yaesu amateur radio equipment from the early days of the FT290R and ran a repair service with the business in those days. Will send you the details of the cure that Harry came to use at the time direct to your email address as an attachment. Has been detailed on this site a number of years back.
It may be that the origins of the fault are associated with possible leakage on the PCB or failing electrolytic capacitors. A report of an "umbrella job" of replacing all the small electrolytics detailed recently are said also to effect a cure. I have a faulty FT290R that has similar problems to yours that is awaiting time at the workbench here, so have been collecting information on possible methods of repair for a quite a while.
Regards,
Bob, G3VVT
In a message dated 31/10/2014 09:25:07 GMT Standard Time, electrichandbag@yahoogroups.com writes:
|
695|691|2014-11-01 22:36:29|g4sra|Re: FT290 low power TX +smeter and squelch problem.|
On 01/11/14 10:14,
g3vvt@... [electrichandbag] wrote:
If I recall Harry's article correctly, it only cited issues with RX i.e.
AGC, but please check as I haven't.
The ALC control is derived earlier in the chain than the FET in question
in Harry's article. I do recall him stating that he never identified the
actual issue. Sometimes simply strapping a resistor to ground only works
for a week or so and then the fault returns. The result is more likely
attributable to the effect of applying a hot soldering iron to the area.
On the plus side, it is a 'harmless' mod with no side effects, try it
and see...
|
696|691|2014-11-03 18:37:12|rtufty|Re: FT290 low power TX +smeter and squelch problem.|
Hi all.
I've connected the FT290 to a bench PSU and left it running into a dummy load. I've kept the tone button down with a rubber band round the set and a PCB stand-off to press down. First night the PCB stand-off pinged away somewhere. Second night the current the set used crept up until it hit the current limit. Started at about 100mA and finished at about 500mA, which caused the voltage to drop to about 6V. Currently running at about 700mA, 12V. The smeter needle looks to be behaving more sensibly and the squelch is back to a more normal position. A quick test transmission opened my local repeater. So looking good! I'll give it another day or two transmitting to the dummy load. Any problems in future and it's getting a 47K resistor added.
Thanks for the help.
Bill (M1BKF).
|
697|697|2015-01-02 22:50:29|Rui Martins|FT-290R and HF transverter.|
Hi,
I will sell my FT-209r with mobile case, fl-2010, fl-2050, transport bag and Tokyo Hi-power hx240 hf transverter.
Rui Martins
|
698|698|2015-03-02 00:22:46|jk4bfs|Equivalent load for whip antenna|
Hi All,
I have just acquired an FT290r with the telescopic antenna missing.
From what I have read the aerial should be in place even if you are using the rear socket ?
I guess the chances of finding a replacement at a reasonable price is very slim.
Could you replace the internal antenna with a fixed capacitor to simulate the effect of the antenna being inserted into the grounded sleeve, or cut a length of tight fitting coax and connect the braid to where the hot connection for the antenna is ?
any help much appreciated
Regards
Alan G8XLH
|
699|698|2015-03-02 17:38:12|david656179|Re: Equivalent load for whip antenna|
A very interesting question.
I have disconnected mine at the tag board because I have a Mutek Board fitted. I had oscillations and carefully re-read the instructions, they talk about removing the whip then the tube, but on reassembly only refer to putting the tube back. I agree some sort of capacitor my well work because this forms part of the tuning.
I would like to know what the right thing to do is as well.
73’s
David
|
700|698|2015-03-02 20:41:58|g4sra|Re: Equivalent load for whip antenna|
A very common mod - install a BNC Chassis socket connected up with RG58.
Re-align the first RX stages and last TX stages following the
instructions in the manual.
TIP: to remove the old telescopic antenna mounting bush use a warm (too
hot to touch, too cold to melt solder) soldering iron to push it out and
then the plastic won't crack.
|
701|701|2015-03-02 21:08:20|w7apm|Parts Needed|
Need volume control and knobs.
Tnx!
Marty
KL7AM
|
702|2|2015-03-09 01:34:46|electrichandbag@yahoogroups.com|New file uploaded to electrichandbag|
Hello,
This email message is a notification to let you know that
a file has been uploaded to the Files area of the electrichandbag
group.
File : /ft-290-gain.doc
Uploaded by : joapar123 <
joapar@... Description : Ft-290 increase sensitivity and more info japanese repair site
You can access this file at the URL:
https://groups.yahoo.com/neo/groups/electrichandbag/files/ft-290-gain.doc To learn more about file sharing for your group, please visit:
https://help.yahoo.com/kb/index?page=content&y=PROD_GRPS&locale=en_US&id=SLN15398 Regards,
joapar123 <
joapar@...|
703|703|2015-04-11 21:55:36|martin.barfield|Your Support Wanted|
Myself, Martin G7MRV (the group owner!) and Bob M1BBV, will be doing the long distance challenge Lyke Wake Walk on 28/06/2015, to raise money on behalf of Mines Advisory Group
Landmines, cluster munitions, UXO |
| | | Landmines, cluster munitions, UXO MAG is a not-for-profit organisation clearing landmines, unexploded ordnance (UXO) and other remnants of conflict for the benefit of communities worldwide. | |
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|
We will be doing two SOTA activations on 2m during the walk, and would love any sponsorship or donations from group members who would like to support us and our charity.
To support us, please visit our JustGiving page here
Read Martin's story |
| | | Read Martin's story Martin is raising money to help MAG (Mines Advisory Group) save and improve lives worldwide. | |
| Preview by Yahoo |
|
Yes, this is a blatent plug by the group owner! The link to the group? Well, the 2m SSB SOTA will use my FT-290mk1 !!!
Regards
Martin G7MRV
Group Owner and Admin
|
704|704|2015-04-14 00:42:01|dave_gotech|Squelch on ssb|
Has anyone managed a mod to allow use of Squech on SSB.
Regards
Dave...G4DAX
|
705|705|2015-04-18 23:27:39|martin.barfield|Replacing melted or corroded battery holders|
The terminals on my original battery holders finally gave up and disintegrated! Original Yaesu holders, or even exact replacements, are almost impossible to find
I have successfully replaced the holders with new modern units, after a bit of rather brutal modification!
Most modern 4xC plastic battery holders are 110mm long, the originals were 108mm! They do not fit as is. But it occurred to me that the mechanical support was provided by the steel carrier, so the holders didnt technically need to be intact!
So, to make modern holders fit as replacements - I simply cut them in half! Shaving a bit off until they were a total length of 108mm, and then putting them in the carrier and letting the carrier provide the mechanical support!
Photos can be seen on my blog
CQ DX DE G7MRV QRP K |
| | | CQ DX DE G7MRV QRP K A week or so ago I ordered, off ebay and from China, a kit for a 40m Pixie transceiver. This was a tad over £3 including postage! I cant source the part... | |
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|
Simple and cheap! Total cost of repair £3.98
I have a set of 8x 4000mAhr NiMH's in mine. A further thought is that if your holders are caput, and you can build a suitable charger, then the holders could be dispensed with entirely and a battery pack be made up using modern tagged C, or even better sub-C, Hybrid NiMH cells, or even lithiums.
Hope this is useful for someone
Martin
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706|706|2015-04-19 12:38:15|datatag_uk|FT290R MkII Frequency Range Modifications & Spares|
Hello All
I've been a Radio Amateur since taking my RAE in 1984 but gave up the hobby in the early 90s when family came along, and ended up selling my trusty FT-290R with Mutek front end as I didn't have the time to use it!
I revalidated my licence a few years ago and am just getting back into the swing of things, recently purchasing a Yaesu VX-3E along with a used FT-290R MkII from a well-known auction site but, unfortunately, not everything was as it seemed....
I've had a few issues with the FT-290R MkII and to cut a long story short it turned out that the PA had died and whilst the rig transmitted OK to my VX-3E nearby, my RF power meter confirmed it was only putting out a few milliwatts into a dummy load. Inside the rig I found that the lamp switch was broken and the actuator shaft had been cut short whilst in the battery pack the lamp button/lock was missing, the two cardboard "C" cell contact assemblies had been removed, the plastic cell separators had been hacked away and someone had fitted a 1000mAh "AA" NiCad pack!! I wish I'd spotted this sooner as I'd just bought a set of ten 2600mAh NiMh "C" cell batteries to go in it (they came in pairs), along with a proper NiMh charger for 8-10 cells.
I ended up buying a new PA transistor and fitting this restored the output power to normal. I also bought a used FBA-8 battery holder complete with original lamp button/lock but had a few problems with this as some of the battery contacts were tarnished and corroded. I cleaned up all the contacts and applied some contact grease to stop any more trouble, and this sorted out the power issues.
When I finally got all this done I found that the rig has been modified to receive and transmit on any frequency between 140 and 150MHz - and I would like to return the rig to standard "C1" or "B" spec so it only covers 144-148MHz (or 146Mhz if that isn't possible). Does anyone know how the wide-band mod was done in the first place and how to "undo" it?
Also, would anyone have any spares such as a lamp switch and actuator shaft? I could probably repair the original shaft or make a replacement, but it seems like the original switch is no longer available.
Any help or advice would be appreciated!
73s
Derek - G1LZL [QTHR IO84FO]
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707|706|2015-04-19 12:59:10|neildrnkll|Re: FT290R MkII Frequency Range Modifications & Spares|
Hi
I found this attached picture on the internet a while ago.
It might be useful.
Neil
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708|708|2015-04-20 19:47:47|martin.barfield|Power being output on USB with no mod|
Having just repaired the battery holders on my FT-290R mk1, ive come to give it a good check over prior to taking it up on the hills for SOTA - and a good job I have!
It seems that for some reason im putting out nearly 2W in USB mode with NO modulation! The S-meter also sees and confirms this, being almost FSD, whistling up the mic shows some deflection of the meter needle up from this, and some detectable modulation (unfortunately, although my comms test set can show me that theres spurious power there, It cant cope with actual SSB!)
Likewise, in low power, I see about a third of a watt with no mod.
FM works just fine, as does LSB, in both Hi and Lo power.
Clearly something is either getting into the mic audio chain that shouldnt be there (theres no CTCSS or anything on this rig) or, perhaps more likely, I have a carrier balance fault?
I thought I'd ask on the group if anyone has seen this before, before I start making adjustments!
Any ideas?
Martin G7MRV
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709|706|2015-04-20 20:25:12|datatag_uk|Re: FT290R MkII Frequency Range Modifications & Spares|
Hi Neil
Many thanks for the info, looks like I just need to (re)fit a zero-ohm link resistor to get the rig back to normal.
I'm currently working away from home (IO81LD90) so I'll give this a go when I return.
73s
Derek, G1LZL
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710|708|2015-04-21 11:07:58|martin.barfield|Re: Power being output on USB with no mod|
Answered my own question! (I suppose as group owner - I ought to be the one answering these sorts of questions!
)
It was indeed the carrier balance - adjusted via VR1001. Didnt seem to affect LSB in any way though, which I thought odd.
So thats two faults fixed in a few days - just need to sort the intermittent PTT switch now!
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712|706|2015-04-21 13:15:26|johnretro|Re: FT290R MkII Frequency Range Modifications & Spares|
Hi guys good to have found you.
I have a similar issue with my 790RII. I want to remove the 1750 tone burst and fit a CTCSS board.
As I see it these links and diodes determine the model A, B, C or X, and by implication the frequency range, repeater offset and whether a tone board is fitted.
But the question is, which link or diode determines what?
There are also the two "BURST / CALL" links on the CPU unit I still have to figure out. I like understanding stuff but this particular radio is stumping me...
EDIT to add: figured it out. The schematic is wrong :-) This is not new to me. With the jumpers in the "burst" position as indicated, the call button on the front panel goes via JP05 to the two diodes D03 and grounds the PTT line. It also goes back through JP04 to the centre pin and from there to the transistor Q06 which sends power to the tone board. CALL, in other words. With the jumpers to "call" as indicated, the CALL button gets re-routed to the BURST line on the SW unit, which causes Q01 to close the switch matrix... in other words, the CALL button becomes part of the switch matrix and the processor needs to deal with it. It does so via R22 to JP04 which then turns power to the CTCSS board on.
Simple, once one accepts that the schematic can be wrong :-)
Currently stupmed by the purpose of the "BUSY / TIME" switch on the CPU unit? I can understand wanting different scan modes maybe (over here 70cm isn't busy enough to test what happens) but why is the switch so inaccessible?
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713|706|2015-04-21 16:23:19|johnretro|Re: FT290R MkII Frequency Range Modifications & Spares|
Yargh, follow up on my own post. Of course the schematic is right, but confusing (well, it confused me :-) The functionality is aligned with the schematic, it's just that "BURST" line which actually presses a button to select the CALL channel.
Still trying to figure out what the diodes / resistors do.
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714|714|2015-04-26 23:44:16|smallmetro|FT290 Mk 1 - removing main board|
I have an FT290 Mk 1 with a squelch fault. I suspect the problem has already been covered in an earlier series of postings, but when I tried to get the main board out to investigate, I couldn't remove it.
I disconnected everything obvious but the board still wouldn't move. I could lift the edges a little but didn't want to cause any damage so didn't apply much force.
Am I missing something? I couldn't see any instructions anywhere so I assume it's fairly self explanatory, but rather than break someting I put it all back together.
Thank in advance,
John
G4YTJ
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715|714|2015-04-27 11:43:19|dave_gotech|Re: FT290 Mk 1 - removing main board|
John....its a while since I removed a main board but I am sure there is one or two screws in the component area of the board to stop it vibrating I gues. I seem to think it took me a while to find it/them.
Dave.
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716|714|2015-04-28 16:08:58|smallmetro|Re: FT290 Mk 1 - removing main board|
Thanks, Dave.
I'll have another go when I get time and if I manage to remove the board I'll put a document in the files section detailing what to do.
73
John
G4YTJ
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717|717|2015-06-25 13:35:20|martin.barfield|GB0MAG this Sunday 28th|
Hi All,
OK, so this is a blatant plug by the group owner!
This coming sunday, 28th June, Myself G7MRV and Bob M1BBV are walking the Lyke Wake Walk for charity on behalf of Mines Advisory Group (MAG)
We will be operating the UKs 1st! 'mobile' Special Event Station' GB0MAG as we go, from around 08:00 BST
Although we originally intended to use HF, this proved too heavy, and using my FT-290mk1 had no advantage over my Alinco F1, which is what we will be using (with a J-pole mounted on my pack!)
We will operate 2m FM only, somewhere around 145.475Mhz
Please, if you are in range of the North Yorks Moors, give us a call!
even better - sponsor us here -
https://www.justgiving.com/MB-LykeWake2015
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718|652|2015-06-30 00:32:59|jboys1229|Re: FT290 Mk 11|
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719|652|2015-06-30 09:47:10|kkyahoo|Re: FT290 Mk 11|
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720|652|2015-07-01 04:50:46|jboys1229|Re: FT290 Mk 11|
The FBA-8 battery packs. New in the box!
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721|652|2015-07-01 13:04:39|koyaanisqatsiuk|Re: FT290 Mk 11|
The FBA-8 isn't a battery pack it's simply a case to hold 9 C cells
It doesn't come with any batteries and at £34.94 a piece that seems pretty pricey.
Slim Haines
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722|652|2015-07-01 16:48:56|datatag_uk|Re: FT290 Mk 11|
I would say that's a fair price for a new FBA-8 battery case, as I paid around £30 for a good second hand one. The previous owner of my FT-290R MkII had kindly ripped all the C-cell contacts out of the battery case and soldered in a 1000mAh battery pack made from nine AA cells and some "gaffer tape"...!!
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723|652|2015-07-01 17:32:39|Peter Brookes|Re: FT290 Mk 11|
Look in Maplins, for battery cases, or model shops.
I've replaced mine from maplins
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724|652|2015-07-02 02:59:56|jboys1229|Re: FT290 Mk 11|
Here in the states it seems to be a pretty rare item. The Yaesu 290/690/790 radios seem to be rare here also. That's why I was surprised to find the battery boxes brand new in the packaging. Maybe I paid too much, but when an item is hard to find and in prime shape, I will go ahead and pay the premium. Your mileage may vary. Thanks, John W8BCR.
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725|725|2015-07-02 03:12:33|jboys1229|5 switch tone board|
I just picked up both a FT-690rII and a FT-290rII. The 290 has a tone board that has 5 rocker type DIP switches versus 7 slide DIP switches as the book shows. Do I have a home brew board, or has anyone seen this before? Thanks, John W8BCR
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726|725|2015-07-12 13:33:34|martin.barfield|Re: 5 switch tone board|
Couldnt say for certain, but it sounds like a 3rd party board. If its homebrew, a giveaway would probably be a lack of a silkscreen or conformal coatings, commercial units normally have these (though not always!)
Either way, so long as it gives out usable tones at a usable level, you have an advantage over most of us!
Several years ago, I started setting up to supply little PIC chip based tone kits for the FT-290 - I still have all the parts, never got around to making the PCBs! (I also still owe my supplier for the parts!!!)
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728|728|2015-07-23 15:11:20|g8bke|FT 290R Mk 1 - no mod.|
I have an aged FT290 Mk 1 bought from new many years ago, which has
developed the following fault. There is no modulation on SSB or FM. In the
latter mode it just transmits a blank carrier. If you cycle the mode switch
between all its positions several times the mod. comes back on both these
modes. But leave the radio alone and the next time when you come to use it
the fault may have returned or if your unlucky it may not. The microphone has
been checked out and is fine as is its cable.
I have an idea what is causing the problem but I'd like to hear from other
members who may have had a similar fault?
73
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729|729|2015-07-23 15:13:45|g8bke|FT290R Mk1 - no modulation|
I have an aged FT290 Mk 1 bought from new many years ago, which has
developed the following fault. There is no modulation on SSB or FM. In the
latter mode it just transmits a blank carrier. If you cycle the mode switch
between all its positions several times the mod. comes back on both these
modes. But leave the radio alone and the next time when you come to use it
the fault may have returned or if your unlucky it may not. The microphone has
been checked out and is fine as is its cable.
I have an idea what is causing the problem but I'd like to hear from other
members who may have had a similar fault?
73
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730|729|2015-07-23 22:07:14|koyaanisqatsiuk|Re: FT290R Mk1 - no modulation|
Hi
Whilst not having come across this problem I'd be suspicious of failing electrolytic(s) somewhere in the audio path.
You really need to check the audio path from mic input onwards with an oscilloscope and see if the audio disappears in one of the common sections dealing with the audio prior to both the SSB and FM modulation stages.
Unfortunately I'm no where near any of my schematics and manuals and wont be for quite some time but the fact that it comes and goes is very similar to other capacitor based problems that appear as the rigs age.
73
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731|731|2015-07-24 01:57:41|jboys1229|Headset/mic and ptt button|
I'm having real trouble locating original YH-1 headset and SB-10 PTT button. Are there substitutes out there that I can use that any one knows about? Thanks, John W8BCR
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732|729|2015-07-24 10:07:47|g8bke|Re: FT290R Mk1 - no modulation|
Okay thanks for your thoughts. I have looked at the cct. diagram and there is no common circuitry following the mic. input. Indeed the mic. output is split via a 0.01uF C, to the FM modulator and via a 1uF to the SSB mod. I guess if the 1uF was leaky it could be upsetting both stages? But I think the jury is still out on that one!?
73
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733|733|2015-08-18 04:02:03|jboys1229|FT290RII "B" Model frequency opening|
So here's the saga of my FT experiences. I have acquired two FT690RII's, both with ctcss boards and amplifiers. I have also acquired two FT290RII's, one with an amplifier and the previously posted 5 DIP ctcss tone board, the second one has no amp, is a model 'B', and has the "burst" tone board. Over the next few days my plan is to open the 290's both up, extending the frequency on the "B" from 144-146 to 144-148, and replacing the burst board with an FTS-7 tone board. If successful, I will acquire another ctcss tone board to replace the 5 DIP board in the other 290. This will require rewiring the plug, as some hardwiring was done to the homebrew board. I may take a board from one of the 690's, as 6 meter repeaters around here are few and far between. I'll try and take a few pictures and give a full report, as I would have liked to have seen this information myself. Any pointers would be appreciated! At least the two require work on opposite ends, so I can look back and forth for reference. Stay tuned!
John W8BCR
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734|733|2015-08-22 05:38:34|jboys1229|Re: FT290RII "B" Model frequency opening|
1st update. Got the frequency step mod done on the "B" model. It required cutting a jumper. Next step will be to open up frequency range. I believe I will be clipping a resistor and opening the frequency up all the way so I can receive other frequencies. I found the two jumpers I have to move to change the burst tone. It will require desoldering and resoldering. I'll update later.
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735|733|2015-08-27 03:39:49|jboys1229|Re: FT290RII "B" Model frequency opening|
I now have the frequency steps done. The snipped jumper took care of that. The frequency range is now opened up also. That was achieved by removal of a resistor. It was about 1/16" wide by 1/8" long. Talk about difficult to find. The frequency diodes and resistors are on the backside of the board that the push buttons are on. I moved two small wire jumpers to change the mode from burst to continuous. The tone board I have is a Piexx after market board. When I key the mike, the repeater opens, but I am having some more issues, because I am getting reports of having heavy noise and my audio is unintelligible. I can hear responses from the repeater just fine, including the one giving me the bad report. I have two of these FT-290RII radios, and the same Piexx tone board doesn't seem to work with either radio. Has anyone got an original tone board they want to get rid of? Have you heard of Piexx boards being questionable? The radios sound really nice talking to each other on FM simplex. SSB sounds like they are a little off frequency. FM simplex good, SSB marginal. Does this indicate an alignment needed? I seem to be raising as many questions as I am solving problems. As for now, I have two great FM simplex sounding radios. I took pictures, which I'll post later. Stay tuned for updates. The good news is that you can convert a 'B' model to an 'A' model. Just gotta solve the tone audio problem!
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736|374|2015-09-14 11:10:21|johnretro|Re: Power Problems?|
Hi Gene
I know this borders on necromancy :-)
I'm replacing the M57745 in my FL-7025 and was wondering if you solved your problem, whether it involved a new M57745, and whether you knew if the FL-7025 needs any tuning / setup after replacing the module?
Thanks
Wouter ZS1KE
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737|737|2015-10-02 12:13:54|martin.barfield|mk1 Carrier Balance fault|
I wonder if anyone has come across this before,
On USB only, when I Tx, I have an initial burst of carrier that slowly decays away, but then during the transmission slowly increases again! The presence of this carrier makes QSOs impossible until it reduces. Ive managed a few contacts with it in this state by letting the carrier reduce before speaking, and making the overs short.
I can adjust the carrier balance with VR1001, but it doesnt stop the problem, I just end up chasing the pot around finding a spot which gives me a few moments to make a contact!
I suspect maybe a duff capacitor, but dont understand why the level of this carrier would increase, decrease, increase like this during transmission?
Clearly, when I find and fix whatever is causing it, my carrier balance will be out!
Anyone any ideas?
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738|737|2015-10-02 12:58:53|martin.barfield|Re: mk1 Carrier Balance fault|
As a bit more info. Ive found from the schematics that the carrier balance pot VR1001, which serves both USB and LSB, is part of the circuit around Q1012, and MC1496 chip. As both LSB and USB are common at this chip, and LSB is working fine, my suspicion has fallen on the USB specific parts around the USB carrier crystal X02. Im starting to wonder if the crystal has failed.
I'll get the frequency counter or scope on it and see what its doing, compared with the LSB crystal.
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739|739|2015-10-05 08:51:22|pa1cjt|Issues|
Hi all out there, when the FT-290R MK1 came out I bought it directly, sold it and now got an oldie back.
Putting power to it several things are directly observed and I hope that someone or more can advice me before taking it complete apart.
1. SSB seems not te be working
2. FM seems to be working
3. When switched on Power indication is going S9 +++ in the corner
4. When making a call the power indication is going to S0 (rapidly) but signal is received on handheld radio
I've to verify the current consuming what is going on
5. backlight is not working
6. backlight/power check switch shows S9 or S9 +++
7. Memory not working butthat will be and CR2025 replace issue
Probably all of the electrolytes should be replaced but perhaps there are other ideas (everything is welcome incl the directions for that)
Best regards/73's
de Kees
PA1CJT
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740|739|2015-10-05 09:15:41|koyaanisqatsiuk|Re: Issues|

That sounds like the standard AGC fault.
Go to this section in the files and carry out the mod detailed
Slim G4IPZ
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741|739|2015-10-05 09:23:42|PA1CJT (best 73's de Kees)|Re: Issues|
Hi Slim,
thx for the answer. I'll look in to it.
best 73's
de Kees
PA1CJT
Op 05-10-15 om 09:15 schreef
special@... [electrichandbag]:
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742|739|2015-10-05 10:26:19|koyaanisqatsiuk|Re: Issues|

Hi Kees.
As an addition I have found that sometimes the fault recurs after a year or so and changing the resistor again restores the radio to fully working.
My suspicion (and it is only that) is that the PCB (being very poor quality) can absorb small amounts of moisture which effectively change the component values as I also found that running a hot air gun over the board can also make the radio start working again.
So I am suspicious that the heat from the soldering iron when adding the resistor (or changing it again) dries the board out and the fault clears.
However this heat 'repair' also fails again after several months.
My FT290s (I have several) are all in an outside shack which could explain the moisture problem as they have all had to be got at on more than one occasion.
I have also always thought it odd that this fault only seems to appear on the 290 and never on the 690 (the 790 is a different beast in that area)
This is purely a theory on my part as I have never been able to definitively prove it.
73
Slim
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743|739|2015-10-05 10:29:08|PA1CJT (best 73's de Kees)|Re: Issues|
Hi Slim,
is it possible to replace Q1014 (2sc2603e) for an equivalent type of transistor?
Searching the Internet it seems to be a rare item in the normal stores.
Due to eye problems it is getting difficult to work on/with SMD parts so it will be a puzzle to get it done.
best 73's
de Kees
PA1CJT
Op 05-10-15 om 09:15 schreef
special@... [electrichandbag]:
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744|744|2015-10-14 01:15:15|Tony Walsh|Disconnected wires in FT290R. Need help identifying where the discon|
Folks, any assistance on this problem appreciated. I have an FT290R on which the LCD display was recently replaced. This was a very difficult job and unfortunately several disconnections occurred during the process and I wonder if anybody in the group would have the expertise to help me identify where the disconnected wires go? I attach a photograph which might help with the diagnosis.
1. My first disconnection relates to a plain white wire running from the three back slider switches routed under the battery compartment and emerging beside the fuse-holder. I think this may be for the panel lamp but I am unsure.
2. The second disconnection is of one end of a glass diode. One end is soldered to a pad between the ground strap and the VFO push-button switch on the bottom of the rig. This diode looks like a modification or afterthought. It could possibly be disconnected from the first pin (on the left) on the ten-pin plug along with the green/white wire as the plastic is slightly melted at this point as can be seen from the attached photograph. However, I cannot be sure of this.
3. There is a thirteen-pin plug just behind the ten-pin one and there are two problems here. The fourth pin from the left looks as if there originally was a black/white wire connected and that it was possibly purposely cut. The reason I think that is that an unconnected black/white wire is in the vicinity and it looks like a very short stub of the same colour is still soldered to the fourth pin from the left.
4. There is a maroon/white wire connected to the third pin from the left of the thirteen pin plug but the other end is free and not connected anywhere. I have no idea where this should be connected to or if it should be left unconnected?
I would hate to have to scrap the rig on accound of not knowing where these unconnected/disconnected wires go. Therefore I am appealing for help through this Group.
Best 73 de Tony (EI5EM)
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745|745|2015-10-14 10:02:22|g6uzt|FT290 MK1 doing a "boing" when you first key the mike.|
Chaps.
My beloved 290 has a strange "Boing" when you first key the mike on FM (not sure about SSB).
This can be heard at the receiving end and is quite noticeable.
The radio has gone through the workshops and been set up correctly (according to the manual).
Any suggestions?
Rick.
DE G6UZT.
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746|744|2015-10-14 11:45:08|martin.barfield|Re: Disconnected wires in FT290R. Need help identifying where the di|
My mk1 is open at the moment for repair, i'll photograph the same view as yours and post it up for you to compare with shortly
Regards
Martin
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747|745|2015-10-14 11:47:10|martin.barfield|Re: FT290 MK1 doing a "boing" when you first key the mike.|
Can you check on SSB? USB in particular
These sets do have a bit of a 'feature' on SSB at least that theres a few dozen milliseconds of unbalanced carrier at key up. Mine has developed a fault where this doesnt go away though!
Its possible the same thing is occuring on FM on your set, so it would be interesting to compare,
Its easy to see on SSB as the meter needle doesnt drop all the way back to zero
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748|744|2015-10-14 14:58:00|martin.barfield|Re: Disconnected wires in FT290R. Need help identifying where the di|
Tony,
Attached are photos of these sections in my mk1. They might be able to help you identify where the wires go,
not sure at all of the diode!
Martin
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749|745|2015-10-14 20:14:21|g6uzt|Re: FT290 MK1 doing a "boing" when you first key the mike.|
Evening chap.
Just checked, but the needle stays planted on 0 on SSB.
I can't test the output on ssb at the moment, I don't have a means of listening to it with me.
I'll pop it over to the test gear in the week and let you know.
Cheers.
Rick.
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750|744|2015-10-17 01:49:32|Tony Walsh|Re: Disconnected wires in FT290R. Need help identifying where the di|
Many thanks Martin,
I really appreciate it. i will let you know how I fare out.
Tony
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751|751|2015-10-18 15:59:54|jk4bfs|For Sale FT290 MK1 UK Only|
Hi all,
I have an FT290 I no longer use.
It does not have a Mutek or CTCSS Board
The battery compartment is clean and Dry Cells are fitted.
No charger supplied
The internal antenna is missing, but I have made up a length of coax to simulate the original retracted antenna, and stored in the antenna tube. The end of the antenna tube at the front panel has been covered up with a circular piece of plastic.
You now have only the rear socket working.
Looking for £50 plus postage/meet up in UK.
email me at g8xlh"at"ntlworld.com
replace "at" with @
Regards
Alan
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752|548|2015-10-19 21:35:08|james_hickox|Re: Finer FM frequency steps for the FT-790RII|
Hello,
Has anyone been able to get the FM steps even smaller? I would like to be able to tune in 1 KHz steps if possible.
Thanks,
James Hickox
AA5AO
|
753|751|2015-10-20 15:31:02|jk4bfs|Re: For Sale FT290 MK1 UK Only|
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754|548|2015-10-20 19:11:07|stanwhite_snr|Re: Finer FM frequency steps for the FT-790RII|
Whenever I needed to do this, (rarely), I just switched to SSB, tuned, and switched back to FM...
HTH,
73 de Stan, G4EGH
|
757|756|2015-10-31 14:37:27|martin.barfield|Handling Spam posts - Was - Re: (no subject)|
All,
When a post occurs that is likely to be spam, please DO NOT replay to it either on the group or directly. Spam WILL NOT BE TOLERATED. But please do not confound it by replying to it.
Anyone whose account is the source of spam will be placed back on moderation, until such time as the group owner (myself) is satisfied their posts are clean. Should spamming re-occur, or the posts not stop, that account may be subject to instant banning.
|
758|758|2016-01-26 15:07:19|k4lmp|FT-690Rii No T|
I know this isn't a 690 group, but due to the similarities to the 290, I'm hoping someone can help. I recently acquired a 690Rii, that has a problem. It has the 6020 linear on the rear. The radio was working fine, and had 12 watts out on high, and about 2.5 watts on low. All of a sudden, the radio quit transmitting. I remove the linear, and the radio itself has no output. The funny thing is, the ON AIR (red) LED doesn't even come on. When I key the mike, the RX cuts off, but no output and no TX LED. I tried another mike, same result. It even varies the green busy LED when I talk into the mike on SSB, but no TX LED, and no output. One day it works, next it doesn't. I was hoping someone could point me where to start looking.
Thanks & 73,
Jeff
K4LMP
|
759|758|2016-01-27 10:08:36|telemech46|Re: FT-690Rii No T|
Hi Jeff,
The PA transistor may have blown. It's not an uncommon problem on the 2m version.
Regards
Neil
|
760|758|2016-01-27 15:06:11|k4lmp|Re: FT-690Rii No T|
I thought about that. Do you think that would cause the red "on air" LED to not light up, when the mike is keyed? That is what puzzles me. I opened the radio up last night, and looked for anything loose or broken and found nothing.
Thanks,
Jeff
K4LMP
|
761|758|2016-01-27 15:22:06|smallmetro|Re[2]: [electrichandbag] FT-690Rii No T|
I wonder if the synth is losing lock on transmit. That may explain the led not coming on.
John
G4YTJ
--
Sent from myMail app for Android
Wednesday, 27 January 2016, 01:06PM +0000 from "
jefff@... [electrichandbag]" <
electrichandbag@yahoogroups.com |
762|758|2016-01-27 15:38:42|k4lmp|Re: FT-690Rii No T|
I'm not sure. I have a couple of 100 Mhz scopes. I wouldn't begin to know where to look, though. The display shows the correct frequency on TX, and if it is set to + or - offset, it even switches to the correct frequency on TX. Thank you so much!
|
763|763|2016-02-11 23:58:32|martin.barfield|mk1 will not work on internal batteries|
Hi All,
Ok, im a little stumped on this one!
Im dealing with a 290 mk1, which will work perfectly on external supply, but not on internal batteries at all. In fact, turning the set on with the batteries in actually shorts them out! I can even watch the voltage of the pack recover after turning the set off again!
Its not the cells, they are fine in one of my other 290s, and neither is it as I initially suspected just high contact resistance in the old battery holders - ive changed the whole battery tray for the recently refurbished one from my other set.
As the radio works ok on external power, im suspecting an issue with the power socket, or parts around it. Has anyone seen this mode of failure before?
All the diodes on the socket test out fine, which leaves the capacitors or the socket itself
|
764|763|2016-02-12 00:14:14|martin.barfield|Re: mk1 will not work on internal batteries|
Oh, never mind! Answered my own question a few minutes after posting!
I decided to plug in the external power lead, without it connected to a PSU, to take some continuity measurements. I then waggled it about a bit in the socket -
and it started working on battery when I took the plug out!
So, it is, after all, a dicky switch contact inside the socket!
I'll give it a blast of servisol later and a good exercising with the plug in it
|
765|765|2016-02-29 21:18:13|g8vhl|AGC fault - possible cure found?|
Lots have been said and written about the now classic AGC fault on the FT-290. One of the proposed causes of the fault was said to be moisture absorption by the pcb. Like many people, I found the AGC fault on my 290 could be reduced by heating with a hairdryer, although this did not differentiate between driving some moisture from the pcb, or simply warming the components. So I decided to try an experiment.
I had a small dehumidifier, basically a plastic box with a heating element (resistor) mounted on a metal plate and surrounded by approx 1/2 Litre of Silica Gel. An indicator strip changed from blue to pink when the unit was saturated and needed drying out. The heater was only used to dry out the silica gel.
I removed the top and bottom covers and the battery compartment from the rig and put it into a large, clear zip-lock plastic bag along with the dehumidifier and a small thermo hygrometer, squeezing out as much air as I could, and folded the bag to try and stop fresh, moist air from re-entering.
I set the whole lot aside and occasionally monitored the temperature and humidity, which varied between 16 and 20 deg C and 7 to 9 percent RH.
After 6 weeks I decided to give the rig a try and found that the fault had gone.
Two weeks later and there is still no sign of it returning, but whether it is a permanent cure remains to be seen. I am thinking of putting some small packets of silica gel inside the rig should the fault recur.
|
766|765|2016-03-01 13:48:16|martin.barfield|Re: AGC fault - possible cure found?|
Thats a very interesting result!
Most military radios contain dessicant cartridges, so it would make sense to keep any moisture out of the system.
Silica gel packs can be obtained from the Far East for pennies, it has to be worth a try. Even if adding a few doesnt work in every case, theyre not going to harm anything being in there
|
767|767|2016-03-11 16:20:22|buz90a|FT290R|
Hi Guys, Just hot off EBay, I got a FT290R that had about 20Volts instead of 13.8Volts, would the best place to check (as there is a low load resistance between deck and +13.8v rail), would the RF o/p Transistor be checked for low resistance, and maybe other trannies similar. I suppose the decoupling electrolytics also would be worth checking. I have the circuit diagram for it. I also got a 'Donor' set but you don't really know how good it is..!
73's for now
Bernard GI4HDJ
|
768|768|2016-03-11 19:57:02|Pencoys|FS: FT-290 mk1 and FT-790 mk1|
Hi Folks,
located in the UK and would prefer selling in the UK but may concider EU
destinations.
Both sets are working, but have been stored in a dry cupboard for a few years.
only one microphone and that has a perished cable.
I cannot offer a guarentee due to their age, but both fire up and the LCD's
are not bleeding.
looking for about £120 for the pair, may concider spliting if nessesary.
cheers, Mike G8NXD qthr
|
769|767|2016-03-11 21:15:42|stanwhite_snr|Re: FT290R|
"
Hi Guys, Just hot off EBay, I got a FT290R that had about 20Volts instead of 13.8Volts, would the best place to check (as there is a low load resistance between deck and +13.8v rail), would the RF o/p Transistor be checked for low resistance, and maybe other trannies similar."
Had one once that had a similar;ar fate. Only the output tranny went west.... (I think it was a 2SC1947).
73 de Stan, G4EGH
|
770|767|2016-03-12 02:17:16|Bernard Mc Garry|Re: FT290R|
Thanks for the info, and 73's from Bernard GI4HDJ
On Friday, 11 March 2016, 19:15, "stan@... [electrichandbag]" "Hi Guys, Just hot off EBay, I got a FT290R that had about 20Volts instead of 13.8Volts, would the best place to check (as there is a low load resistance between deck and +13.8v rail), would the RF o/p Transistor be checked for low resistance, and maybe other trannies similar."
Had one once that had a similar;ar fate. Only the output tranny went west.... (I think it was a 2SC1947).
73 de Stan, G4EGH
|
771|768|2016-03-13 11:34:28|iw1au|Re: FS: FT-290 mk1 and FT-790 mk1|Hi Mike!
I would be potentially interested to FT-790 only; may you contact me at iw1au@...?
Thanks.
Gian, IW1AU
|
772|772|2016-06-12 12:27:47|Bernard Mc Garry|Squelch Drift|Hi Guys,
My FT290 mk1, has (to me anyway) an unusual fault. When I set the squelch to say one 0 clock position (enough to silence the white noise). After about 10 mins. the white noise opens up the squelch up and the knob has to be increased further clockwise to silence the noise, then you run out of squelch. I have changed both diode D32 and electrolytic C97 around the Squelch chip Q1019, but the fault remains.
I have just read on this group about a common AGC fault linked into the possible PCB moisture absorbition, as the 290 in question is comparitivity old, could this be the 'drift' problem?
Thanks in advance
Bernard GI4HDJ
|
773|773|2016-06-14 11:42:18|gi0gdp|Regulator Board PB-2239|I have just replaced the memory back up Lithium cell after 30 years (didn't last long!).
Put the Reg board back in and nothing came on.
Got the handbook and circuits out and here if there was NO ICL7660 on my board.
The -6v8 is generated the old way, however i think i have looked at all the circuits in the files section
and none show this but only the ICL7660 version, so does anyone have a copy of the circuit that they can put into the files section.
regards
Geoff
GI0GDP
|
774|765|2016-06-14 15:24:11|buz90a|Re: AGC fault - possible cure found?|I also was having a weird problem with my squelch setting 'drifting'. It would be fine initial setting when first turned on, but about 7 mins later, it had to be increased clockwise, eventually it was fully clockwise, which wasn't enough. Cooling the components around the squelch chip made no difference, I changed both Diode D32 and electrolytic C97, still no difference, so maybe if I check out the 'humidity' problem, it might work!
Bernard GI4HDJ
|
775|775|2016-06-16 16:44:55|Bernard Mc Garry|FT290 mk1|Hi Guys'
The radio set came to me as one that had 20V DC applied to it, as the 13.5V supply wen't faulty. I replaced the PA o/p transistor with a new 2SC1947 (Mitsubushi), but when I transmit, the transceiver takes 2 Amps, and begins 'thrermal runnaway' with the heatsink getting hot. The DC gain of the transistor. Has the PA load inductors have to be tuned or some other adjustment have to be made when a new PA transistor is replaced, as I don't wish to burn it out?
Cheers
Bernard GI4HDJ
|
777|775|2016-06-19 11:48:55|gi0gdp|Re: FT290 mk1|HI Bernard,
Second attempt at a reply, there is a bias pot fitted on my 290 close to the radial finned heatsink on the output transistor.
You will need turn this right down and then select SSB and slowly increase for say a 20-25mA increase on Tx..
Or break into the collector of the device and set the current that way.
regards
Geoff
GI0GDP
If your set doesn't have the pot then you will need to and a resistor from R71 to ground to reduce the standing current, or if you want add resistance to R70 but the first way is easier.
|
778|775|2016-06-19 17:59:03|Bernard Mc Garry|Re: FT290 mk1|I see the bias pot now, so that's a great help, as I must be using an older schematic as it's not in it..important point is it's on the pcb!
Many thanks
73's
Bernard
From: "gi0gdp@... [electrichandbag]" HI Bernard,
Second attempt at a reply, there is a bias pot fitted on my 290 close to the radial finned heatsink on the output transistor.
You will need turn this right down and then select SSB and slowly increase for say a 20-25mA increase on Tx..
Or break into the collector of the device and set the current that way.
regards
Geoff
GI0GDP
If your set doesn't have the pot then you will need to and a resistor from R71 to ground to reduce the standing current, or if you want add resistance to R70 but the first way is easier.
|
779|775|2016-06-20 20:59:25|stanwhite_snr|Re: FT290 mk1|
I may be wrong, but it is worth a check. I seem to recall there was a diode that was part of the bias circuit. The idea being that when the PA got hot, the diode (physically attached to it) also got hot, and dropped the PA bias a bit.
If the collector-base junction was blown short by the excessive voltage on the old transistor, the diode could have "copped it" as well. If that went open circuit, as well then all bias control is lost. I seem to recall making PA bias adjustments on the pot, and it never got as high as 2 amps.
HTH,
73 de Stan, G4EGH
|
780|775|2016-06-24 11:43:09|Bernard Mc Garry|Re: FT290 mk1|
Hi Geoff, and other people who gave helpful advice,
I discovered yes there is a bias pot right beside the heatsink, but as the set was subject to overvoltage which required me to replace the pa transistor, I discovered that the diode ground path, which 'shunts the PA base to Gnd' was o/c as the cathode (ringed end) of the diode is not actually soldered to the pcb, rather it is soldered to the top of the can of the pa transistor, which via the heatsink is grounded, and I didn't notice this untill I had replaced the transistor and traced the circuit. Luckily I clamped it below the clamping bolt washer and now the current is now within normal limits...phew what a job trying to trace the ground path. I didn't expect the manufacturers to use such a method, but maybe it was a more direct rf path to stop parasitic oscillation, or whatever!!
Thanks to everyone for your help, it's deeply appreciated, as I thought I was on my own here !!
73s
Bernard GI4HDJ
From: "gi0gdp@... [electrichandbag]" HI Bernard,
Second attempt at a reply, there is a bias pot fitted on my 290 close to the radial finned heatsink on the output transistor.
You will need turn this right down and then select SSB and slowly increase for say a 20-25mA increase on Tx..
Or break into the collector of the device and set the current that way.
regards
Geoff
GI0GDP
If your set doesn't have the pot then you will need to and a resistor from R71 to ground to reduce the standing current, or if you want add resistance to R70 but the first way is easier.
|
781|775|2016-06-24 23:18:06|stanwhite_snr|Re: FT290 mk1|
Hi Bernard,
The diode is soldered to the PA case to get as much thermal contact with the transistor as possible. It is important this is done, because as soon as the transistor heats up, the diode heats up, and it reduces its voltage across it by 2 mV per degree C. This starts to shunt away the transistor bias, preventing thermal runaway.
By doing what you have done, you will probably never get the diode anywhere near the temperature of the transistor, and thermal runaway remains a possibility. The fact that you had around 2 amps of collector current without the diode shows that it has a "rather large" influence on things....
Remove the heatsink, leaving the transistor in place. Scrape the top of the transistor case, and with a very hot iron QUICKLY tin it. Aim for no more than one second of contact, iron to transistor. DO NOT have the heatsink in place when you do this, as you will then need to apply the iron for much longer to get the solder to melt, possibly damaging the transistor.
Replace the heatsink, align the diode, and again, with a hot iron, a very quick "dab" to solder the diode.
Then place a "dob" of heatsink paste on the diode in such a way as to get the maximum possible thermal contact between the transistor case, and the diode body. Remember that the diode needs to make contact with the transistor case, as the heatsink runs cooler.
In the early 1980's this was a common way to provide thermal runaway, but it was not the best way to bias the transistor. Linearity was compromised a little, but it was cheap and effective. You could get acceptable performance from a low power stage, such as the FT290 PA.
Happy "FT290'ing!
73 de Stan, G4EGH
|
782|775|2016-06-25 08:21:11|Bernard Mc Garry|Re: FT290 mk1|
Hi Stan,
Thanks for this tip. I am still using the original diode, but I just grounded it on copper heatsink, so I'm glad you pointed it out, great Thanks
73's Bernard GI4HDJ
PS I notice our callsigns aren't far apart!!
From: "stan@... [electrichandbag]" Hi Bernard,
The diode is soldered to the PA case to get as much thermal contact with the transistor as possible. It is important this is done, because as soon as the transistor heats up, the diode heats up, and it reduces its voltage across it by 2 mV per degree C. This starts to shunt away the transistor bias, preventing thermal runaway.
By doing what you have done, you will probably never get the diode anywhere near the temperature of the transistor, and thermal runaway remains a possibility. The fact that you had around 2 amps of collector current without the diode shows that it has a "rather large" influence on things....
Remove the heatsink, leaving the transistor in place. Scrape the top of the transistor case, and with a very hot iron QUICKLY tin it. Aim for no more than one second of contact, iron to transistor. DO NOT have the heatsink in place when you do this, as you will then need to apply the iron for much longer to get the solder to melt, possibly damaging the transistor.
Replace the heatsink, align the diode, and again, with a hot iron, a very quick "dab" to solder the diode.
Then place a "dob" of heatsink paste on the diode in such a way as to get the maximum possible thermal contact between the transistor case, and the diode body. Remember that the diode needs to make contact with the transistor case, as the heatsink runs cooler.
In the early 1980's this was a common way to provide thermal runaway, but it was not the best way to bias the transistor. Linearity was compromised a little, but it was cheap and effective. You could get acceptable performance from a low power stage, such as the FT290 PA.
Happy "FT290'ing!
73 de Stan, G4EGH
|
783|775|2016-06-26 19:21:19|stanwhite_snr|Re: FT290 mk1 Heatsinking|
Hi Bernard,
Glad to have helped. The FT290 was not my first radio, but it remains a favourite. Yes, that was a while back, and yes, our calls are close, Hi. Still got any hair? :-) :-)
73 de Stan, G4EGH
|
784|784|2016-09-18 22:59:27|Dave Wood|Alignment Instructions for 790RII|
Anyone on the group have the frequency alignment instructions for the 790RII? All I can find is some fuzzy copies of the schematic. Mine is off frequency and needs some minor tweeks. Thanks Dave
|
785|785|2016-09-19 14:21:42|Robert Wilkinson|Re: Alignement Instructions for 790RII|
Hi Dave,
Presume you have tried the Mods.DK web site?
They list the schematic for the Yaesu FT-790RII. I downloaded the technical
supplement for the FT-290RII when I needed to work on one and see that as
quite good copy. Failing sourcing the correct Technical supplement, possibly
the 2m version can give some idea how to approach your problem?
Just an idea.
Regards,
Bob, G3VVT
________________________________________________________________________
1. Alignment Instructions for 790RII
Posted by: "Dave Wood"
w4ej15@... w4ej31
Date: Sun Sep 18, 2016 1:59 pm ((PDT))
Anyone on the group have the frequency alignment instructions for the
790RII? All I can find is some fuzzy copies of the schematic. Mine is off
frequency and needs some minor tweeks. Thanks Dave
Messages in this topic (1)
|
787|787|2016-11-10 22:43:07|josepoyanuk|Simple radio test advice|
Hi,
I just bought a FT-290 mark 1 from eBay, and the seller gave me a classic: "it belonged to someone who took care of it. It is fully working"
I only have another VHF radio to test it now that it has arrived to me and I know, at least, that it powers up. It came with batteries.
Could someone please give me some points of advice in how to identify any fault the radio may have? A small list of quick tests that I could do, anything that comes to your mind, will help me a lot.
Thank you in advance.
|
788|787|2016-11-10 23:35:54|koyaanisqatsiuk|Re: Simple radio test advice|

Hi
The simple answer is to fire it up and see if it works.
Unless you have a fully equipped workshop and can (or want to) run through a full alignment and test routine, then powering it up and operating it is the simplest way.
Use a dummy load instead of an antenna if you're doubtful about anything especially on the transmit side.
The user guide can be found in many places on the web if yours came without one.
Slim G4IPZ
|
789|787|2016-11-10 23:40:23|ian|Re: Simple radio test advice|
Simple things like see if recieves one the Beacons if you within range such as GB3VHF, transmit into a dummy load with a power meter in circuit to check output. Otherwise like Slim says unless you have test kit not a lot else you can do without actually trying it
Ian
2E0IJH
Sent: Thursday, November 10, 2016 at 9:29 PM
From: "special@... [electrichandbag]" To: electrichandbag@yahoogroups.com
Subject: Re: [electrichandbag] Simple radio test advice
Hi
The simple answer is to fire it up and see if it works.
Unless you have a fully equipped workshop and can (or want to) run through a full alignment and test routine, then powering it up and operating it is the simplest way.
Use a dummy load instead of an antenna if you're doubtful about anything especially on the transmit side.
The user guide can be found in many places on the web if yours came without one.
Slim G4IPZ
|
790|787|2016-11-12 16:17:39|josepoyanuk|Re: Simple radio test advice|
Thank you for the advice,
I have tried what you both advised me and the radio works on that side. I picked up a signal from someone taking, and I tested for transition-reception with my handheld Icom.
I've got the user manual too but I did not find anything useful apart from learning how it works.
What baffles me is that the step options are 12.5 and 25 kHz whereas the manual says that they are 5 and 10 KHz.
Another thing that I noticed is that the squelch does not work at all in CW, USB or LSB. It is permanently opened in those band.
Does anyone know why is it like that, please?
|
791|787|2016-11-12 16:45:07|ian|Re: Simple radio test advice|
For the Uk, 12.5 and 25 knhz spacing is correct. 5 and 10 is other parts of the world You need a Uk Manual and squelch only work in FM, thats normal
Ian
2E0IJH
Sent: Saturday, November 12, 2016 at 2:17 PM
From: "josepoyanuk@... [electrichandbag]" To: electrichandbag@yahoogroups.com
Subject: [electrichandbag] Re: Simple radio test advice
Thank you for the advice,
I have tried what you both advised me and the radio works on that side. I picked up a signal from someone taking, and I tested for transition-reception with my handheld Icom.
I've got the user manual too but I did not find anything useful apart from learning how it works.
What baffles me is that the step options are 12.5 and 25 kHz whereas the manual says that they are 5 and 10 KHz.
Another thing that I noticed is that the squelch does not work at all in CW, USB or LSB. It is permanently opened in those band.
Does anyone know why is it like that, please?
|
792|787|2016-11-13 00:41:14|josepoyanuk|Re: Simple radio test advice|
ok Ian. thank you!
|
793|787|2016-11-13 01:16:21|josepoyanuk|Re: Simple radio test advice|
There is something that I dont understand. The beacon is in 144.430 but with 12.5 and 25 kHz step, it is not possible to set that frequency. I can hear the beacon but it is offset. Then what is the point for those steps? Should I try to change my radio to 5 and 10KHz?
|
794|787|2016-11-13 01:24:40|ian|Re: Simple radio test advice|
The steps only apply to FM, when in ssb or CW, you will have fine tuning, GB3VHF is 144.430 CW as it transmits a CW tone.
We use 12.5kc channels in FM starting at 145.000, we used to use 25kc channels the old s1-s20 channel numbers
On 144mhz the SSB/CW part of the band we do not use channels it's fine tuning, so when on 144mhz put the rig in ssb or cw dpending on whether you listening for voice or CW, the SSB calling freq is 144.300.
When on 145mhz you want to be in FM.
Do you have a Licence or in training as this is basic Foundation level stuff?
Ian
2E0IJH
Sent: Saturday, November 12, 2016 at 11:16 PM
From: "josepoyanuk@... [electrichandbag]" To: electrichandbag@yahoogroups.com
Subject: [electrichandbag] Re: Simple radio test advice
There is something that I dont understand. The beacon is in 144.430 but with 12.5 and 25 kHz step, it is not possible to set that frequency. I can hear the beacon but it is offset. Then what is the point for those steps? Should I try to change my radio to 5 and 10KHz?
|
795|787|2016-11-13 11:30:11|josepoyanuk|Re: Simple radio test advice|
I think I understand a bit now. The fine tuning allowed me to correct the frequency to the beacon one but this is only for reception, and the radio will transmit in the step frequency. Anyway I am not transmitting for now, and it was only for testing.
I am studying for the Foundation license. The radios I have are for my collection, specially vintage radios, but I now want start using some of them, so I will get the foundation first.
Thank you,
jose
|
796|787|2016-11-13 11:54:19|ian|Re: Simple radio test advice|
No The radio will transmit on what frequency you have displayed, Suggest you read up in the Foundation book the differences between FM and SSB operation.
for SSB and CW operation you use fine tuning 1kc at a time for FM Operation you use channels 12,5kc or 25kc apart.
This is a good online version of foundation training and might help, http://www.brats-qth.org/training/flc/index.htm
Ian
2E0IJH
Sent: Sunday, November 13, 2016 at 9:30 AM
From: "josepoyanuk@... [electrichandbag]" To: electrichandbag@yahoogroups.com
Subject: [electrichandbag] Re: Simple radio test advice
I think I understand a bit now. The fine tuning allowed me to correct the frequency to the beacon one but this is only for reception, and the radio will transmit in the step frequency. Anyway I am not transmitting for now, and it was only for testing.
I am studying for the Foundation license. The radios I have are for my collection, specially vintage radios, but I now want start using some of them, so I will get the foundation first.
Thank you,
jose
|
797|787|2016-11-14 01:37:22|stanwhite_snr|Re: Simple radio test advice|
Of course...... Switching to FM and having a rapid QSY to near where you wish to be on SSB, and then switching to SSB to get initially 1kHz steps, and then fine tuning on 100Hz steps is the way to go.
I don't think the OP was necessarily confused with the modes, maybe just a lack of detailed knowledge of the radio he got hold of... And for what it is worth, I just modified mine, and then, having had it for 35 years, I had to read the book.....
73 de Stan, G4EGH
|
798|787|2016-11-15 01:57:41|josepoyanuk|Re: Simple radio test advice|
Thanks for all the help. Yes, the link is useful. The Foundation Booklet I have is just a magazine and I will need more than that. So I will use this and other links
Great ! I can now also change 1kHz in FM. I have it working, thank you! Now I need a License :-)
|
799|799|2016-11-15 12:41:06|g8gkq|Replacing the Display on an FT290R|
I have written an article for the December 2016 RadCom (pp 60-61) on fitting a replacement display to the FT290R. I'd be interested to know if anyone else builds the design.
Whilst I cannot provide copies of the article (you'll need to borrow a friend's RadCom or join the RSGB), I'm happy to provide advice if anyone has trouble in reproducing the design.
In brief, I use a PIC (which fits in battery compartment) to decode the data going to the old (failed) LCD display and drive a miniature LED display fitted in its place.
Dave, G8GKQ
|
800|799|2016-11-15 14:25:42|martin.barfield|Re: Replacing the Display on an FT290R|
Hi Dave,
I was quite interested when I saw your article, would you be able to upload the circuit diagrams and firmware file to the groups files section?
I was planning on emailing you but you've beat me to it!
Its great to see a group member solving the issues we have with these radios as they age. If only we could find a definitive cure for the AGC issue!
Regards
Martin G7MRV
Group Owner
|
801|799|2016-11-15 18:39:57|g8gkq|Re: Replacing the Display on an FT290R|
|
802|799|2016-11-15 22:46:47|Dave P|Re: Replacing the Display on an FT290R|
Dave,
A fantastic article. I set about attempting to do a similar thing myself sometime ago but couldn't work out how the original display data was formatted. I didn't spend much time on it as I was kindly offered a replacement display which hadn't bled.
Great work. I'm sure it will give many FT290s a new lease of life
73
de Dave - G4UFS
|
803|799|2016-11-15 23:32:23|Gordonjcp|Re: Replacing the Display on an FT290R|
On Tue, Nov 15, 2016 at 08:46:45PM +0000, Dave P
g4ufs@... [electrichandbag] wrote:
I haven't seen it yet, but it's funny - I was just looking at little OLED displays and spotted one that was just about the right size for the window on a 290.
Next thing I suppose is to see how hard it is to get a PIC toolchain working.
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Gordonjcp MM0YEQ
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804|799|2016-11-15 23:51:24|alexm_1968|Re: Replacing the Display on an FT290R|
Hi would that also apply to a FT-290R II ?
Alex VE2AIU
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805|799|2016-11-16 18:42:26|g8gkq|Re: Replacing the Display on an FT290R|
Hi Alex
I've just looked at the schematic for the FT-290R II and the LCD drive is totally different, so my design would not work with it. The Microcontroller appears to drive the LCD directly - it does not use a separate driver chip like the old FT-290R.
Dave, G8GKQ
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806|799|2016-11-18 04:58:57|alexm_1968|Re: Replacing the Display on an FT290R|
Hi Dave, thanks for the info.. Would you know or suggestions on how to fix a disappearing display??
That's what is happening to my FT-290R Mk2 I really would like to fix it..
Alex VE2AIU
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807|799|2016-11-19 12:30:27|mans_9h1gb|Re: Replacing the Display on an FT290R|
Hi Dave,
Just received Radcom and found the article.
Nice Job indeed.
I have a question about the display if I may Dave. The 7 Segment display did you have or you purchased them from some where. If the latter is it possible to the name and/or details of the shop/supplier?
Thank you in advance.
Well done and keep up the good work.
73's
Mans. 9H1GB
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808|799|2016-11-19 16:05:44|Bernard Mc Garry|Re: Replacing the Display on an FT290R|
Hi Dave,
I had exactly the same problem, I searched around but no luck anywhere on the LCD 7 Segment display. The only way I could get one was to buy (on Ebay) a 'for parts' donor FT290 mk1, after a reassurance that the display was previously working with no 'bleeding', and luckily it worked fine, only problem was I had to buy the complete FT290. I also got other parts from it that were useful. It was a individual person not a retailer/secondhand dealer, so keep watching on Ebay or if you have Gumtree in your area. I read somewhere that it's almost impossible to convert it to an alternative LCD kit cos the multiplexer driver chip had to be specially designed to work with the processor unit at Yaesu's request, so the only way is as described earlier. They are really a 'classical' set,and luckily made in Japan, and can be modified for all sorts of use, so don't give up.
73's
Bernard GI4HDJ
From: "mansueto.grech@... [electrichandbag]" Hi Dave,
Just received Radcom and found the article.
Nice Job indeed.
I have a question about the display if I may Dave. The 7 Segment display did you have or you purchased them from some where. If the latter is it possible to the name and/or details of the shop/supplier?
Thank you in advance.
Well done and keep up the good work.
73's
Mans. 9H1GB
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809|799|2016-11-19 23:57:15|Ken Johnson|Re: Replacing the Display on an FT290R|
I also have a couple of 2-and 690r's with crook displays, and I came across these pages a while ago. I swapped a couple of emails with him, but then he just stopped replying- others may have more luck.
Ken, vk7krj
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810|799|2016-11-20 00:11:33|Ken Johnson|Re: Replacing the Display on an FT290R|
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811|799|2016-11-20 11:29:50|g8gkq|Re: Replacing the Display on an FT290R|
Hi All
You can obtain the LED display that I used from Kevin Avery of G3AAF Electronics. He visits most of the Radio Rallies in the UK but has said that he is prepared to supply by mail order. Please contact him directly on kevin@.... The displays are less than £4 each - please contact him to agree a mail order price and method of payment.
73
Dave, G8GKQ
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812|799|2016-11-20 11:38:37|Gordonjcp|Re: Replacing the Display on an FT290R|
On Sun, Nov 20, 2016 at 01:29:49AM -0800,
dave.g8gkq@... [electrichandbag] wrote:
Oh, I *did* pick a couple of them up. They're just the right size, too!
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Gordonjcp MM0YEQ|
813|799|2016-11-20 11:55:00|Mansueto Grech|Re: Replacing the Display on an FT290R|
Thanks for the info Dave
73's
Mans. 9H1GB
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814|799|2016-11-20 18:35:21|g8gkq|Re: Replacing the Display on an FT290R|
Hi Alex
The only thing that I can think of for your FT290R II is that the display connection to the PCB might need some attention. They usually just compress rubberised connections against the PCB, and this can get loose or corroded.
Dave, G8GKQ
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815|799|2016-11-21 03:49:09|alexm_1968|Re: Replacing the Display on an FT290R|
Hi Dave,
Thanks I'll take a look at it..
Alex VE2AIU
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816|652|2016-11-28 01:26:36|g4joeuk|Re: FT290 Mk 11|
Sorry for the long delay John, but at last I have found a new one on the Bay.
Its NOS ,
A question now, to power the Battery box without the 9 batteries in, is it center positive or center negative on the lead?.
I got confused with the manual. FT290r II
Any advice welcome.
Joe
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817|652|2016-11-28 01:40:24|Geoff Blake|Re: FT290 Mk 11|
I am pretty sure that it is the wrong way round, i.e.+ve outer - it is like this to facilitate the internal switching and is rather a nuisance.
Geoff G8GNZ