In article
<4e12d442-1505-423d-9759-0354fd4e85ac@[EMAIL PROTECTED]
>,
John <jdupre5762@[EMAIL PROTECTED]
> wrote:
> On Aug 28, 4:55 pm, Orval Fairbairn <o_r_fairbairn@[EMAIL PROTECTED]
>
> wrote:
> > In article
> > <2246c861-90f0-4772-9c66-e88303325...@[EMAIL PROTECTED]
>,
> >
> >
> >
> >
> >
> > John <jdupre5...@[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.
> >
> > --
> > Remove _'s from email address to talk to me.- Hide quoted text -
> >
> > - Show quoted text -
>
> I did notice that the upper antenna is loosing some of its coating and
> the exposed areas look corroded. I would replace the antenna for that
> reason alone but the owner wants some more confirmation than looks.
> The lower antenna (bent whip) doesn't appear corroded although the
> whip ****tion is slightly bent.
>
> John Dupre'
That would do it on the upper antenna -- especially if it has flown
through rain. Is the antenna airfoil-shaped or one of theose
wrapped-metal, round ones? I had the latter and it eventually succombed
to moisture.
--
Remove _'s from email address to talk to me.
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