On Tue, 23 Dec 2003 09:45:11 -0800 (PST), N6KJ wrote:
>The color goes away (screen switches to black/white) whenever I transmit
>on 80 or 40 meters. No problems with 20 meters and higher. TVI present with
>as little as 10 watts output into a dipole about 30 feet from the TV.
Sounds like a really severe case!
I suspect either power line or antenna line coupling, and I suspect the
filters you are using are ineffective below 20 meters. The 43 material
is primarily a VHF material. I would try toroids optimized for HF, and
wrap as many turns as possible around them on all the wirng entering
the TV. And I would disconnect any extra wiring so that I was looking
at only one connection at a time (for example, power and antenna
connected, VCR disconnected).
Along the same line: What happens with rabbit ears or equivalent on the
TV and nothing else connected but power? If you still have the
problem, this suggests either a shielding problem or a power line
coupling.
And is the color going away because RF is getting into the color
circuitry, or because the RF signal is dropping in level in the
presence of RF?
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