Problem with Dittel Radio

If anyone can help I would be most grateful...

I have a Dittel radio - I can't remember the model but it is the one that you pull out and adjust the presets with a screwdriver.

During normal use it has an intermittent fault whereby after a transmission the unit will 'lock' producing a quiet whine from the speaker and reception and transmission becomes impossible. The problem is fixed by a power cycle.

I though it might be an earthing problem and have put an earth wire from the unit case to the pedal fittings that would suffice for the national grid. It hasn't helped.

The radio has been bench tested twice and come back fine. The unit has been taken out and used in another glider several times - it always works fine.

Can anyone give me any advice before I spend lots of dosh on a Becker....?

Sticky PTT switch (high resistence short)? Bad TX relay? Bad TX relay driver?

8-)

That would be an FSG60M......great old radio!

Sounds to me like a stuck relay.......but I think only a good avionics shop with find the problem...it doesn't sound like something that would be fixed extrenally. Where are you located....I can give you shops that could probably help

Have seen the same or similar problem before. Problem is the gain for the auto-squelch is set too low. Sometimes happens with age due to resistors changing resistance. Nick's Avionics in Miami, FL fixed mine. Nick's advertises in SOARING Classified section if you want contact info. A friend sent his back to the Dittle factory (long wait for return).