On Mon, 25 Sep 2017 07:51:21 -0700 (PDT), wrote:

Hi all, am having an issue with my new to me dittle radio. worked fine
for two flights now on startup it breaks squelch for a while even with the
switch set correctly. it lasted about 15 minutes then went normal. The
next flight it only did that for 5 minutes. after reading the manual it says
nothing about being able to adjust auto sq setting. Is there a way to
increase the auto squelch? or could the internal battery be getting low?
I did the usual turning of stuff to rule out interference from other equipment.

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I have had to retire 2 FSG71M radios with what sounds like a similar
problem. Following reception of a transmission, the radio would behave
as if the squelch had been turned off, with the typical hiss coming
out of the speaker.

Key to recognizing the problem I had is that if I tapped the transmit
button, the squelch would come back on, and the hiss would disappear.
This would work for a while, until the problem would repeat a few
minutes later.

My final guess was that this was a transmit/receive relay failure as
detailed in 3U's very informative website.
https://sites.google.com/site/threeu.../dittel-fsg71m

Never finding a suitable relay replacement, I finally gave up on the
71M and installed a new gen Dittel KRT-2 radio (8.33kHz, 2278
channel). 4 mike inputs available for both dynamic and standard
(electret) mikes, dual watch, and 100 channel memory.

Well suited to Dittel replacement in that an adaptor is available to
make the install plug-compatible with FSG71M.

Over a year so far and very satisfied.

Bob