I had a similar problem on my 900 MHz repeater. The
site is about 1/4 mile from a much busier site that
has a lot of paging, cellphone, and other stuff on it.
All it takes is two systems to be off frequency by a
hundred Hz or so, and when they cause intermod, the
receiver sees that frequency difference as PL, and
tickles the squelch. The repeater was being keyed up
dozens of times per day.

My solution was to use DPL on the repeater input. The
repeater is now completely quiet unless it's being
used or sending out its beacon every 30 minutes.

Not much you can do if you need to maintain a PL tone.
Intermod will happen. The frequency tolerance for
commercial equipment is going to be a few hundred Hz,
so differences in the PL tone range are highly

Good luck with your new technical committee duties.

Bob M.
--- Scott <[EMAIL PROTECTED]> wrote:

> Well, I thought I would bring this saga to a
> close...it is a paging TX
> "falsing" the 141.3 CTCSS tone just enough to
> kerchuck the repeater.
> Try any other tone and it is quiet as a mouse! Tried
> moving it across
> the room, still to no avail. FYI, the CAT is set up
> for COR & Tone.
> Since this thing is being tested at a different
> tower than where it
> will be, I am going to opt to leave it off for now
> and when it gets in
> it's permanent home, hope the tone will work right
> there. All our
> other machines, including the privately owned ones,
> have the same
> 141.3 tone. It's permanent home is about 15 miles
> away, and there are
> no paging TX's there...
> Thanks for all the suggestions! I sure hate I got
> into working on
> repeaters because of the death of one of our club
> members, but I am
> enjoying it! (Got 4 of these puppies to keep up,
> plus 2 APRS digis!)
> Scott NA4IT

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