Another thing to watch is common mode interference on the CATV shield. I have
a situation next door, that I'm working on (slowly because I've been off the
air and on the tower all summer) where there is interference to one particular
TV set when you just touch the shield on the connector. This type of
interference is usually characterized by rectified sounding SSB (or CW) in the
TV audio, independent of channel and independent of volume control setting. In
my case it is also very proportional to the power with nothing at 100 w and a
fair amount at 1200 w. My case is 75 and 40 m only.
The neighbor is having the CATV people install a ground at the entrance to the
house, something I would think would be required by code anyway. If that
doesn't take care of it, I'll try a big toroid common mode filter at the TV
(10-20 turns of the cable on the correct toroid material).
----------
From: Rich Hallman N7TR[SMTP:n7tr@rnodx.org]
Sent: Saturday, September 27, 1997 8:40 PM
To: towertalk@contesting.com
Subject: [TowerTalk] TVI Fliters???
Didnt think I would ever have to ask this question....But here it is....
Who makes the best quality TVI filters?? High and Low Pass filters....
I have a neighbor that just complained that I am trashing Channel 2 4 5...Not
bad on the higher channels....And this is a NEW TV he said....Wonderful!!
Need to try the filter trick first...After that, Ill look for my 20 acres now
instead of next year....
Thanks!! Rich N7TR
*******************************************************
Richard Hallman N7TR N7TR@RNODX.ORG
11870 Heartpine St Ex: KI3V, A92FN, HL9RH
Reno NV 89506 (702) 677-1106
********************************************************
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