On Wednesday, September 28, 2016 at 9:58:34 AM UTC-6, wrote:
I'm having similar squelch issues as the Dittel post with my Becker AR3201. Which direction do you adjust the squelch to reduce noise? Manual shows where the adjustment is located but does not explain adjustments.

Gary C.

Thanks to all for comments on my problem. To potentially help others, here is what I have done and what corrected the problem. Special thanks to Richard at Craggy.
1) Isolated problem to a new electronic vario by turning on each device with squelch off listening for increase in static. Also tested in flight by turning new vario off and having radio no longer break squelch.
2) Separated the power wiring to isolate radio wiring from all other devices. Did not resolve squelch problem.
3) Added ferrite cores to all instrument power wires. No joy.
4) Finally resolution was to increase squelch on radio by turning squelch adjustment pot counter-clockwise 1/8 turn.

I think it is a good assumption that a 1980s radio was not designed with concern for other device interference issues.