On Aug 29, 10:11=A0am, Orval Fairbairn <o_r_fairbairn@[EMAIL PROTECTED]
>
wrote:
> In article
> <4e12d442-1505-423d-9759-0354fd4e8...@[EMAIL PROTECTED]
>,
>
>
>
>
>
> =A0John <jdupre5...@[EMAIL PROTECTED]
> wrote:
> > On Aug 28, 4:55=A0pm, Orval Fairbairn <o_r_fairbairn@[EMAIL PROTECTED]
>
> > wrote:
> > > In article
> > > <2246c861-90f0-4772-9c66-e88303325...@[EMAIL PROTECTED]
>,
>
> > > =A0John <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. =A0The noise is
most
> > > > prevalent when receiving from more distant and weaker transmitters
> > > > like other aircraft and not noticeabl when receiving from closer
mo=
re
> > > > 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
w=
ith
> > > > no change. =A0The most recent change to equipment was an audion
pan=
el
> > > > installation. =A0The noise is not rythmic like ignition noise and
d=
oes
> > > > not rise and fall with engine settings like some alternator noise.
=
=A0It
> > > > is not as intense as the white noise when checking squelch. =A0It
i=
s 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 =A0from 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. =A0I would replace the antenna for
tha=
t
> > 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 =A0from email address to talk to me.- Hide quoted text -
>
> - Show quoted text -
Wrapped metal round antenna with a tear shaped base.
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