Orval, you are chasing your tail. If it does it on BOTH radios, the
probability of a dual identical fault is practically zero, especially if
the
noise on #1 correlates with the noise on #2.
Sure, go ahead and shotgun the thing and then come back in here lamenting
that you spent $X amus on the problem and it is still there.
I've never seen a "wrapped metal" com antenna in my career. Can you point
me to a manufacturer and model so I can see for myself. Most of what
looks
like "wrapped metal" is in fact a fiberglass soda straw with either braid
or
foil inside the straw.
Jim
--
"It is the mark of an educated mind to be able to entertain a thought
without accepting it."
--Aristotle
"Orval Fairbairn" <o_r_fairbairn@[EMAIL PROTECTED]
> wrote in message
news:o_r_fairbairn-0529EB.10115329082008@[EMAIL PROTECTED]
> 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.
|
