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It is possible that it is a local radar signal you are receiving. Usually a
"pop" or "fizz" that lasts a short time and repeats at regular intervals,
corresponding to the RPM of the dish.
It is usually common in active noise headsets as the circuitry is more
succeseptible to this kind of interference.
> Charles McDowell wrote:
> > My plane recently developed a new irritating symptom. Maybe one of you
> > has had something similar or may know what the cause is.
> > About two weeks ago I started occasionally getting loud crackle/pop
> > sounds from the
> > radio. Just a few times in a flight, if at all. Seemed to normally
> > happen near or
> > in the pattern after I started slowing down. I could turn the audio
> > panel off and
> > change to any frequency and it had no effect.
> I had a similar-sounding problem with my radio (Narco) and ultimately
> found that it was caused by loose shielding inside the radio itself.
> There are sheet metal shields soldered to some of the circuit boards,
> and some of the solder connections had broken loose, letting RF out (or
> in). Anyway, resoldering everything made the problem go away. Good
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