I've had a number of these issues in commercial 2-way / paging systems / ham
repeaters I've maintained over the past years and the problem has always
been a leak in the CATV system cabling somewhere, they use the ham band freq
for TV.  While there is always suppose to be isolation between the house
taps on the CATV drops to homes, they may or may not be sufficient, once
your signal get into the CATV system their broadband amps pass it along to
others.   I've seen all kinds of stuff you wouldn't believe people would do,
but it happens.  The last problem I had was a home owner who connected their
cable TV connection to a coat hanger to radiate TV signal to another room in
their house.  A 1/4 KW VHF paging transmitter a half block away gained
access into the CATV system (coat hanger seems to be a fairly effective
antenna at VHF) and wiped out cable TV  for about 10 city blocks.

Rob  K7EI


-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Thursday, January 01, 2004 1:17 PM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Repeater TVI Problem


My 2 meter link on my repeater is causing TVI. This happens only 
on cable ch 18 on Charter Cable here in Yakima, WA. Any one have 
any ideas? This is only on the houses, say with-in 1/2 mile. 

Rod 



 

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