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9Aplus

5th Apr 2010 10:29

Dittel / Filser Electronic ATR 720c HELP

I am looking for schematic or service manual for
Dittel / Filser Electronic ATR 720 c comm TRX

RX works fine, but after winter break TX relay is oscillating on PTT attempt.
Any tips & tricks before use of try & error service approach :}

9Aplus

29th Mar 2020 13:28

cicicmimi
your PM box is full
my unit is now ok, after PA transistor replacement
I managed to find only this -> https://www.afg.ethz.ch/wp-content/u.../ATR_720_C.pdf

cicicmimi

9th Apr 2020 22:26

Quote:

Originally Posted by 9Aplus (Post 5616274)

relay is oscillating on PTT attempt

Oh, I'm fixed it. In my case, the problem was the power supply (I use the COMM on the ground).

The power supply was too weak. I built a new power supply, more powerful. Everything works fine with him.

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