> So how can a scanner interfere with a repeater? I'm probably missing
> something basic but thought I'd ask anyhow.
Given the original description of the problem Mathew has been asked
to help solve, I doubt a scanner is the problem - hence I'm changing
the Subject header...
The local oscillator in scanners can radiate back out the antenna
and be heard some distance away. Many scanners receiving in the VHF
band have the LO offset below the receive frequency by whatever the
IF of the scanner happens to be (10.7 and 10.8 MHz are both common,
but there may be others).
Years ago when I put up my first repeater I encoutered this problem.
The repeater was on 145.110 and the original configuration was
carrier squelch. As soon as I turned it on it started kerchunking
rhythmically... bleep... bleep... bleep... After a few hours hunting
I found a scanner one mile from the repeater site that was causing
it. The owner had 155.310 programmed in the scanner and that one had
a 10.8 MHz IF. Every time is scanned that frequency it keyed my
repeater. 155.310 minus 10.8 equals 144.510, my repeater input
frequency! The signal that thing put at the repeater site a mile
away was quite strong. When the scanner stopped on 155.310 it put a
darn near full quieting signal into my repeater receiver. I'm sure
many others have similar experiences.
Paul
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