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Dittel / Filser Electronic ATR 720c HELP

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Dittel / Filser Electronic ATR 720c HELP

Old 5th Apr 2010, 10:29
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Join Date: Jan 2009
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Unhappy 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
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Old 29th Mar 2020, 13:28
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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

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Old 9th Apr 2020, 22:26
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Join Date: Mar 2020
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Originally Posted by 9Aplus View Post
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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