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Re: [RFI] Eliminating TVI

To: rfi@contesting.com
Subject: Re: [RFI] Eliminating TVI
From: "N6KJ" <kelly@thejohnsons.ws>
Date: Sat, 27 Dec 2003 09:17:57 -0800 (PST)
List-post: <mailto:rfi@contesting.com>
I will work on the power line filtering.  Thanks for the advice.
There is light at the end of the tunnel!  Today, I did some experiments.
I was able to reduce the interference by adding another toroid with lots
of turns to the satellite feed.  I only have mix 43 toroids right now, but
it seemed to help.  I have some mix 77's on order.  At this point it looks
like all of the interference coming down the satellite feed may be gone.
I am still getting some (although not as much, esp. on 40 meters) with
the satellite feed disconnected and playing a DVD.  I'll start working on
filtering the AC line again.  Maybe I just need lots of turns and mix 77.
I hope so.  Thanks for all of the advice.  I'll keep working on it.

On Sat, 27 Dec 2003 07:54:48 -0500, "Tom Rauch" wrote:

> > 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.
> I assume you also have a GOOD common mode and differential mode filter on
> the power line, and the line cords of each are plugged into the same filter.
> Also that nothing else is around the equipment, the two pieces are as close
> together as possible, and the interconnecting cables are all bundled  and
> not hanging like antennas.
> If so, sounds like it is egress into the monitor.
> I'd just be darned sure the line filter is a good one for common and
> differential mode currents.
> 73 Tom
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