David Robbins K1TTT k1ttt at arrl.net
Sat Jan 26 14:13:31 EST 2008

If you have cable tv and have tvi your problem will not be solved with high
pass filters or low pass filters.  Your problems is most likely one of:

1. VERY poor grounding resulting in extremely high currents in house power
conductors... this is the ONLY one that you might be able to fix by doing
something to the radio and grounding system.
2. The antenna is WAY too close to the house, nothing to do here but put up
a higher tower or learn to like qrp.
3. The TV has a pin-1 or shielding problem... that is, it's the tv's fault
that it is letting rf in through the power cord or directly through the
case.  Try a power line filter, and also torroids on all the cables between
the tv/cable/dvd/etc, if that doesn't work buy a new tv or wrap it in
aluminum foil like mine is.
4. The cable system is leaky... either due to poor connections on the road
end, or bad installations in the house.  Take off all the taps, splitters,
extra boxes, dvd players, surround sound, etc.  check the crimp connectors
to be sure their grounds are really connected, then try it with just one tv
direct to the cable... if you still have problems get the cable company to
check their connectors and grounds outside.

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net

> -----Original Message-----
> From: rfi-bounces at contesting.com [mailto:rfi-bounces at contesting.com] On
> Behalf Of rrath at charter.net
> Sent: Saturday, January 26, 2008 19:09
> To: rfi at contesting.com
> Subject: [RFI] TV RFI
> I am sure this topic has come up a lot, but I would like to put a
> different spin
> on it.
> What brand / type are you using?
> Does it work (does your XYL or neighbors like the results)?
> Would you recommend it to a fellow Ham?
> Did you make your own?
> Would you share how you built it with the list?
> The reason for all these questions? I have TVI. I have to get rid of it or
> not
> use the amp I bought. I get a little TVI with out the amp and major TVI
> with it.
> I have cable tv. I have my radio equipment grounded to a single pc of
> copper
> pipe about 12 " long up under the desk, then an 8 gauge wire from the pipe
> to an 8' and a 4' ground rods.
> I will be buying High Pass Filters this coming week. I have 4 good
> neighbors
> that I like and want to be a good Ham to them. I bought the amp to use not
> to look at. Thanks.
> Rod kc7vqr
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