In article
<0d675432-b426-4844-971d-fa14520d6654@[EMAIL PROTECTED]
>,
John <jdupre5762@[EMAIL PROTECTED]
> wrote:
> On Aug 29, 10:11 am, Orval Fairbairn <o_r_fairbairn@[EMAIL PROTECTED]
>
> wrote:
> > In article
> > <4e12d442-1505-423d-9759-0354fd4e8...@[EMAIL PROTECTED]
>,
> >
> >
> >
> >
> >
> > John <jdupre5...@[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.- Hide quoted text -
> >
> > - Show quoted text -
>
> Wrapped metal round antenna with a tear shaped base.
Yup -- That's the kind that I replaced! Apparently, they last only so
long, then they get wet inside.
--
Remove _'s from email address to talk to me.
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