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On 04/28/2014 04:25 AM, Troy Maynor wrote:
> <wingnut54@charter.net>
>
> Hi All, I know this has been discussed before on the forum. I have
> looked til I bleary eyed and can't find the answer I'm looking
> for.
Looks to me (experienced HAM) that you have a failure in your antenna
or the coax cable. Get it checked with a SWR meter to see if it is
still ok.
If it is not ok it can cause the symptoms you described.
The SWR of the antenna can also go wrong if you change something close
to the antenna, like adding another antenna or a piece of metal.
Frans
> When I key the mike I have started getting a loud static noise or
> feedback that wasn't there before. I have near radio silence of
> incoming traffic until I am in the pattern and then it's scratchy.
> It sounds ok with the engine off but I don't know how far I'm
> transmitting or receiving on the ground. I am running an ICOM A200
> and Bob Archer antenna. The antenna is mounted on the fuselage wall
> behind the D panel port side. It has always performed well until
> recently but can't pin down what has changed. I have checked the
> security of all the grounds on and forward of the firewall, as far
> as I can tell. I was thinking it is time to pull the instrument
> panel but got to thinking about these torroids or suppressors. Can
> I just string some of these onto the RG58 coax back near the
> antenna and maybe help matters? I'd really appreciate any pointers
> to look at specifically. I have a Sigtronics intercom with the
> music switcher also. Can the presence of an IPAD communicating with
> a Stratus ADSB cause this? Most of what I found on the forum dealt
> with the transmitter affecting other equipment. This is not the
> case. I am hearing huge noise when I key the mike and can't here
> others calling me until I'm very near, like in the landing pattern.
> I can also hear the electric gyros in the headsets a little but
> that has always been there but not too noticeable, a little pop
> from the strobes faintly, but I can live with that. I just need to
> kill the giant, not the little noises necessarily. I'd like to
> figure out what change took place. Thanks, Troy Maynor 240 TT hours
> to date
>
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> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=422480#422480
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