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Re: [RFI] Eliminating TVI

To: rfi@contesting.com
Subject: Re: [RFI] Eliminating TVI
From: "N6KJ" <kelly@thejohnsons.ws>
Date: Fri, 26 Dec 2003 21:28:58 -0800 (PST)
List-post: <mailto:rfi@contesting.com>
As I mentioned in an earlier e-mail, I already verified that I get
interference when I disconnect the satellite set-top and VCR and ONLY
play a DVD.  I figured this was as good (or better) than a rabbit ears 
test.  As I mentioned before, I get interference when playing a DVD,
when watching a satellite signal, and watching a VHS tape.  In all cases,
I disconnected everything except the TV and the input source.  The only
thing in common with all of these inputs is the TV and the AC line.

On Fri, 26 Dec 2003 15:55:38 -0600, "Jim Brown" wrote:

> It doesn't tell you much, IMO. It sounds like the circuit detecting the
> interference (or having the most problem) is the NTSC color decoding
> circuitry, or perhaps the circuit detecting the presence of the NTSC
> color signal. So you need a signal that contrains that signal, which is
> why I suggested rabbit ears -- small enough to get you a signal from
> the TV station but maybe not long enough to receive enough interfering
> signal to shut down the color. You could possibly also  feed the set
> with a video player (DVD or cassette) on the RF or composite video
> inputs (single coax, not S-video or RGB). If on the composite video
> (single coax), that would go through theNTSC decoder but not the RF or
> IF. 
> I think we're all agreed that your basic problem is to figure out how
> the RF is getting into the set -- is it coming in on an antenna cable,
> a video or audio line, on the power line, or direct to the circuitry.
> If you could find a  barebones hookup of any one of the above sources
> that does not have the interference, you would be a lot closer to the
> solution. 
> Jim  K9YC
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