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Re: [RFI] 160 meters RFI reduction using RF Choke on neighbors TV power

To: rfi@contesting.com
Subject: Re: [RFI] 160 meters RFI reduction using RF Choke on neighbors TV power cord
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Thu, 05 Dec 2013 20:23:54 -0800
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
On 12/5/2013 6:28 PM, Don Kirk wrote:
Yesterday my first attempt at eliminating the RFI turned out to be very
rewarding.  I constructed a simple power cord RF choke for the TV using 14
turns of a power cord on a 2.4" OD Fair-Rite #31 mix toroid core (based on
the K9YC hams guide to RFI document).  The RFI at the neighbors house is
considerably reduced using the choke on the TV power cord, and the RFI at
my house appears nearly if not entirely gone.

Wow, that's great news, Don. It's the first news I've heard of success with a plasma set.

  I will try adding another
choke in line with the first choke to see if additional reduction of RFI at
my neighbors home can be achieved, but I certainly can live with the
results of the single choke.

Good move. Also try a choke on any other wiring connected to the TV, like input from a CATV box, antenna, or audio and video equipment.
  I will also purchase and try a commercial two
stage power line filter on the neighbors TV to see how it compares with the
simple toroid choke approach.

I'd spend money on the chokes first. Remember that line filters only address differential mode noise, not common mode current. The green wire, where the noise usually is, goes right past the filter.

Please do keep us informed. This could be really great news for other victims of a neighboring plasma set

73, Jim K9YC
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