[RFI] Shielding a ground wire

[Jim Brown]

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.