Ken,
This can happen when any two transmitters are transmitting at the same
time, 600 khz apart. I've seen it happen to 2 meter repeaters when two uhf
transmitters 600 khz apart are transmitting nearby when the 2 meter system
was up. I've seen it happen near two AM broadcast stations 600 khz apart.
That's primarily why in Illinois the six meter repeaters don't use one mhz
spacing as there is a high power AM station in Chicago on one mhz.
There doesn't need to be any simple harmonic relationship between any of
the frequencies involved. I've been told by the experts that this is
imposible, that they must be related, but have seen too many first-hand
examples that would prove otherwise.
Cirulators and isolators can help if installed properly but any rusty or
loose bolt or dissimilar metal joint near any of the antennas can cause the
problem. It's avery tough situation to deal with, however, as others have
said, VHF paging is slowly going away
Good luck,
Al, K9SI
Date: Tue, 21 Dec 2004 04:35:35 -0000
From: "kc4ih" <[EMAIL PROTECTED]>
Subject: HELP: 2 meter repeater intermod problem from pager transmitters
We have 146.04/.64 repeater on a nearby mountain top. It worked
great for years with a range of 100 miles or more. Since the phone
company and a pager company installed their high power transmitters
near the site of the repeater (within 100 yards) the repeater is
virtually useless. After much head scratching I believe that the
difference in frequency of the pager transmitter of 600 khz is the
problem but have no idea how to solve the problem without going to
an odd split. The repeater coordinator for this area of Virginia
won't even consider that as an option.
<snip>
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