Dale,
The ARRL Lab can also buy a "brute-force" filter for you to try, as these can
be pretty pricey. We had the complainant in MD willing to try, but his neighbor
stopped cooperating, then the ham moved.
Jim, et al, if there are any suggestions for brute-force filters to try, post
them and I will buy them and have them at the ready.
Ed, W1RFI
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Dale J.
Sent: Tuesday, March 25, 2014 4:01 PM
To: jim@audiosystemsgroup.com
Cc: rfi@contesting.com
Subject: Re: [RFI] ARRL to FCC...
Yes, I agree. The outlet strip was a bad choice but all I had at the time to
try. I am going to make up a choke per your paper which I have and first
chance I get I'll try it out on their set. I use #31 mix snap-on's all over
the shack, but I'll need a big one for this project.
73
Dale, k9vuj
On 25, Mar 2014, at 14:34, Jim Brown <jim@audiosystemsgroup.com> wrote:
> On 3/25/2014 11:49 AM, Dale J. wrote:
>> Once when I had access to the TV, I tried one of those outlet strips with
>> filtering and it made no difference
>
> I would not expect it to. They only affect the differential mode signal. As
> Ed has noted, the signal can be radiated common mode on the power cable, on
> an antenna (or CATV) cable, and even on cables connected to an A/V rig. If
> it's common mode, you need serious mutli-turn ferrite chokes, not "filters."
> Below 7 MHz, Fair-Rite #31 is the weapon of choice. Above 10 MHz, #31 is
> still quite effective, but #43 is slightly better. See my choke cookbook for
> some winding guidelines. Luckily, I've yet to encounter a plasma set, but
> there was a report, I think on this reflector, from a ham who had pretty good
> suppression with a choke on the power cable.
>
> It's also possible for RFI to be radiated from wiring internal to the set,
> and chokes won't help with that mechanism.
>
> 73, Jim K9YC
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