Rick,
Make sure you check other nearby towers for loose or
rusty hardware. I had a similiar problem with a nearby
tower, 100 Ft away from our 146.940 repeater antenna
and the owner used a non galvanized anchor plate for
his guy wires. Well it rusted over time and became the
intermod generator for the site. I installed copper
wire jumpers from each guy wire to the guy rod to
bypass the "IM generator" guy anchor plate. This
solved the problem and the noise is gone.
John, K7JL
--- Rick Stoneking <[EMAIL PROTECTED]> wrote:
> All,
>
> I am trying to resolve a problem on a local repeater
> where they are having intermittent 'noise' problems.
>
>
> Background:
> This a commercial GE repeater that has been modified
> for 2m use. When the noise is not present the
> repeater performance is outstanding with a wide
> coverage area.
> The following have been replaced with new and had no
> effect:
> - tranmitter/receiver
> - antenna (super station master)
> - hardline from duplexer to antenna
> - repeater controller
>
> The noise may be related to weather (wet or cold
> causing an increase in the problem) though it is not
> a everytime event.
>
> It was originaly believed that it was a grounding
> problem but grounding improvements have had no
> lasting effect.
>
> At one point it was said that the guy wires were
> causing the problem so the club recently put
> insulators in all 9 guy wires about 6 to 8 feet from
> the anchor point - no help.
>
> The problem, which sounds like static or popping,
> occurs only during transmitting incoming audio. In
> other words, all controller generated audio is fine,
> no noise what so ever.
>
>
Go to the repeater site and use a signal generator or
some other means to creat a weak signal and key the
transmitter. Then start shaking everything on the
tower. Something ls loose and rubbing on something
else.. I ahd a guy wire problem when the wind would
blow. The repeater was in a 6x6 foot building at the
bottom of a 100 foot tower. The antenna was a station
master at the top. The guy wires at the ground had
about 2 or 3 feet extra that were hanging loose after
the clamps. Some of them were rubbing the guy wires
going to the tower. Clamped them down and that solved
the problem.
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