That's a pretty tough question to answer as variations in transmitter and
amp performance, antenna setup, and characteristics of the neighbor's TV are
all probably more significant that the shielding of coax. Based on my one
experience with TVI when living in a residential neighborhood (came in on
some TV's, not mine, and the neighbor's telephone) a world of good can be
done for little cost by using a low pass filter at your station, installing
high pass filters on the neighbor's coax, and adding some bypass caps across
the phone line at offending phones. I was running about 400w at the time.
Worth spending the money and effort yourself to maintain goodwill and, in my
case, complaints stopped completely. In fact, neighbors were impressed that
I took an interest and actually did something as the cable company had told
them nothing could be done.
=Vic=
WA4THR
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To: tentec@contesting.com
Subject: [TenTec] 95% Shield
From: Jim WA9YSD <wa9ysd@yahoo.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Thu, 15 May 2008 03:52:47 -0700 (PDT)
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
How much power in watts or milliwatts does it take to interfere with the TV
with an outside antenna when operating HF? How much with cable TV?
Lets say that the outside antenna and cable TV is in an urban area.
Neighbors
house is say 75 feet from the base of the ham tower.
Is that with in the leakage spec of say RG-213 on HF freq?
Keep The Faith, Jim K9TF/WA9YSD
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