Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request
From: Brian Kantor <brian@ucsd.edu>
Newsgroups: comp.dcom.telecom
Subject: Phone Line RF Bypass Needed
Message-ID: <11242@accuvax.nwu.edu>
Date: 23 Aug 90 15:49:55 GMT
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X-Telecom-Digest: Volume 10, Issue 588, Message 7 of 11


Does anyone happen to remember the USOC or other ordering code for the
widget used for bypassing phone line entry to radio transmitter
buildings?

Lemme spring this one on you: Ham radio repeaters on the 2m band are
spaced 600 kHz between receiver and transmitter.  About five miles
from our repeater site is KOGO-AM, on 600 KHz.  We didn't have a
problem until the phone line was installed into our mountaintop site,
but we've measured nearly a VOLT of 600 KHz KOGO on the phone line -
seems that fifteen miles of rural phone lines will make a hell of an
antenna.  When combined with the very strong transmitter signal in the
building, we get a mix that generates a weak carrier on the repeater
station's input and it sits there and sings to itself.

We've used one of the CORCOM power line EMI filters to bypass the
telco line we have, but we're going to be ordering several new lines
installed in the next few weeks and I'd rather have the "official"
filter box if I can get it.  Our installer wasn't able to find the
ordering codes in his references.

Thanx!

Brian