Richard,
We used to have a semi-related problem with a 50 kw FM station's antenna
being close to out two meter repeater's antenna. We could measure several
WATTS of power coming out of our repeater coax overwhelming our system. A
simple 1/4 wave shorted stub, cut to 147 mhz, on a tee at the input to our
two meter cavities, reduced this to where we could not measure it anymore
with a watt meter. This was enough attenuation for us to operate the
repeater.
800 mhz may be an entirely different can of worms, though. As someone
mentioned, a low-pass filter should help your situation. An old VHF Micor
mobile or Motrac would probably contain what you need. However, they use
phono (RCA) for connectors.
Good luck,
Al, K9SI
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