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Re: [RFI] Shielding a ground wire

To: jim@audiosystemsgroup.com
Subject: Re: [RFI] Shielding a ground wire
From: Timo Toro <Toro@ibb.fi>
Date: Sun, 28 Apr 2013 18:21:47 +0000
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
I did fix my problems already. My antenna systems are not incomplete. Of course more and higher masts would be nice, hi.
But if I run over 1KW to my 4el Yagi on 40m and my PC stops working, 
I have to fix that problem. I did not use the band aid either. 
Nowadays my ham shack is more like Faraday shield, hi. And lightning 
safe.
I still like to use word "grounding" meaning low impedance route to 
common point near earth potential.
73, Timo_oh5kw


At 9:08 -0700 28/4/13, Jim Brown wrote:
On 4/28/2013 3:00 AM, Timo Toro wrote:
Tuning the ground lead to series resonance on most problematic band, can help too. As was done in the example?, I sent earlier.
This is NOT a solution, it is a "band aid."   The real CAUSES of the 
problems you are trying to solve are with improper or inadequate 
BONDING between equipment, and incomplete antenna systems.
There is RF on that earth wire you are "tuning" because you are 
PUTTING the RF there. That wire is a conductor, so it is an ANTENNA, 
so it will radiate the current that you put on it and it will 
receive noise.  That earth wire is a problem either because your 
antenna systems are incomplete -- perhaps you have no counterpoise 
or radials on a long wire, for example, so return current for the 
antenna flows on that earth wire, so it is part of your antenna -- 
or because failure to bond together all equipment and all grounds 
causes current on that earth wire to couple into equipment.  To 
understand how this happens, study the tutorial material on "The Pin 
One Problem," on my website.  
http://k9yc.com/publish/htm  Almost all ham gear is built with Pin 
One Problems.
73, Jim K9YC.
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