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Re: [RFI] Adding a shield to the utility service lines?

To: rfi@contesting.com
Subject: Re: [RFI] Adding a shield to the utility service lines?
From: Aaron Kreider <aaron@campusactivism.org>
Date: Fri, 06 Dec 2013 19:25:59 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Thanks for you advice.

On 12/5/2013 12:45 AM, Jim Brown wrote:
On 12/4/2013 9:33 PM, Aaron Kreider wrote:
Another crazy option

Yes, it is. Shielding addresses differential mode RFI, and most trash on power lines is a common mode signal and radiates just like any other antenna. Although I tried a bunch of big clamp-ons on a twisted triad power feed back in Chicago, it was long before I understood how ferrite chokes work, and I'm now nearly convinced that it was a bad idea because a string of beads is inductive.

Even if you could shield that line (it belongs to the power company, so it's not a good idea), the common mode current would flow on that shield, and you would still need to choke it to prevent it from radiating.

73, Jim K9YC

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