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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