Sounds like the problems I fought for years with the B-100, ie your
computer and or GPS is pumping out RF on or near 123.3/5. Try
disconnecting the GPS and see if your radio stops breaking squelch. If
so, try moving the GPS away from the computer and or radio. If your
running a model-20, Cambridge can fix the RF emissons. Try moving the
GPS display away from the computer/radio.
I never did get it completely fixed and finally gave up and bought an
SN-10.
JJ

On Jul 30, 5:22*pm, cernauta wrote:
One of my friends is bothered by his Becker radio, emitting terrible
noises through the speaker, whose origin seems to be the flight
computer (LX7000).
The power supply to both devices is fitted with ferrites.

I tried a few tricks, like wiring the metal case of one or both
devices directly to the negative or to other metal parts of the
cockpit. No effect.

One thing is a bit disconcerting for me: as I removed the antenna
cable from the radio, the noise stopped immediately. The antenna is
integrated in the fin, pretty far away from the panel. The antenna
cable looks like new, it is not bundled together with other wires and
isn't too long.

Anybody have any suggestion?

thank you very much!

Aldo Cernezzi