Sounds like "The Beast" payed you a visit. For a fun and ammusing
test, hook a handie talkie to the duplexers TX port and key it on low
power on your TX freqency. This should drown your reciever into
oblivion with noise no matter what the power level.
Borrow a spectrum analyzer and watch as broadband noise rises + and -
600kHz from your carrier as you key up.
An even funner experiment is to get s 7 element beam with a step
attenuator and hook it to a hand held and put it on your RX frequency
and force the repeater into key down mode. Walk about a block from
your antenna and watch in amazement as all the interference is coming
from your house.
I am betting that there are two FM stations that are 600kHz apart,
Sit down with a FM reciever and plot out the band to see who is who.
Then you can check the vast wasteland of the FCC database to determine
what power people are running. You need to find the mixer, which
could be anything from a clock radio to an electric blanket.
Changing the antenna doesn't work either, I've tried a Station Master,
DB-264, Larsen Magnet Mount and even a coat hanger ground plane with
no changes in the interference.
We were never able to solve the problem so we had to adopt split site.
We are followers of "The Beast", and you are one of us now.
--Matt
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