by Orval Fairbairn <o_r_fairbairn@[EMAIL PROTECTED]
>
Aug 28, 2008 at 04:55 PM
In article
<2246c861-90f0-4772-9c66-e883033251cc@[EMAIL PROTECTED]
>,
John <jdupre5762@[EMAIL PROTECTED]
> wrote:
> I flew yesterday with an owner who pointed out that he is getting a
> type of crackling noise over both comm radios. The noise is most
> prevalent when receiving from more distant and weaker transmitters
> like other aircraft and not noticeabl when receiving from closer more
> powerful transmitters i.e. the tower.
>
> The owner has operated the aircraft with every other system turned off
> including the alternators and has operated on individual magnetos with
> no change. The most recent change to equipment was an audion panel
> installation. The noise is not rythmic like ignition noise and does
> not rise and fall with engine settings like some alternator noise. It
> is not as intense as the white noise when checking squelch. It is a
> type of random crackling like noise.
>
> Any thoughts?
>
> John Dupre'
I had a similar problem years ago, with one of those cheap whip
antennas. I switched to a high-quality antenna and got rid of the
problem.
It appears that moisture had somehow entered the material surrounding
the metal antenna and was causing arcing.
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