Linear SSB relay problems

[Crusher]

What amp was this or who was it made by? Sorry to hear about radio. That's why I always use a Cobra 29 to first test with. If something happens it's an $80 radio instead of big money.

 

[ExitThirteen]

Sounds like there was some oscillation going on and stray RF was saturating the relay keying transistor in the amp, eventually burning it out. That's why over time, it eventually knocked out the transistor so it immediately keyed when you turned it on. Sucks about what happened to the Kenwood tho... Crusher brings up a really good point, however. Always use an "el cheapo" radio for linear testing purposes, so the expensive gear don't get damaged. Bummer deal.


~Cheers~

 

[8113 Northern MN]

Well, I fixed the kenwood. Did some digging and found that not only were the 2290s in it dead...there was two capacitors shot in the rear. Replaced the pills and the caps and she is working top notch again. Kenwood is alive for 2015!

 

[unit511]

So I have the same problem ...the relay stays in. I have to shut off linear switch to drop relay to get into receive again. This happens intermittently. What up?

 

[Crusher]

Keying circuit, leaking transistor

 

[unit511]

Keying circuit, leaking transistor

I replaced a 26v 100mf cap on the board. I cut the leads tight to the underside but I did not notice that the legs had touched the heatsink. I saw the top of the cap had a slight bulge and that annoying relay thing was happening again. Sooooo again I replaced the cap but this time I used my nail clippers to really cut the legs and solder close to the board. I tested that thing all day today talking gibberish just to keep the relay popping in and I out. Not once did it stick!!! I also noticed my dk was slightly higher and my pep was outrageously higher. I now have a nice working amp..