We had exactly the same problem in Ann Arbor. The
pagers were exactly 600 kz apart and up in the 158 Mhz
segment. We installed notch filters and sharp
band-pass filters on the repeater with some success.
Nothing kept it our entirely. I was about to try a
crystal filter on the front end when the interference
just ended. One of the transmitters was taken off the
air. Note though in our situation, the pagers were
there first.
I can't imagine in this day and age, with the death of
VHF paging being on the near horizon, why anyone would
put up a NEW VHF paging transmitter. However,if one of
these pager transmitters is indeed a new installation,
it may be possible to force them off the air. I can't
quote the section, but the FCC told me one time in a
different interference situation that a new or changed
transmitter operation it totally responsible for
solving interference related to their transmitter
within 5 miles of their transmitter, even if their
transmitter meets specs. This rule might possibly just
apply in this situation. They have installed a new
operation that produces an uncurable mix that wipes
out your operation. That mix could be occurring in
your transmitter, your receiver, one of the paging
transmitters, someone else's transmitter, etc, etc,
etc. I would suggest that you immediately contact your
nearest FCC field office and discuss this with them. I
wish I could give you the section, but the engineer
who told me about it never actually quoted the
section.
Good luck.
Dan Hancock N8DJP
President, RADAR Inc.
www.qsl.net/wr8dar
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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