The only "ground loop" I've ever experienced occurred with a Piper Tri-Pacer
during a severe cross wind landing. It is not a question of "will you
ground loop one, but it is a matter of time when you will ground loop one".
Minor damage to the craft, other damage reported was to the pilots pants.
73
Bob, K4TAX
----- Original Message -----
From: "Jim Brown" <k9yc@audiosystemsgroup.com>
To: <tentec@contesting.com>
Sent: Monday, December 09, 2013 3:42 PM
Subject: Re: [TenTec] Ground Loops in the Station
On 12/9/2013 1:11 PM, Rick - DJ0IP / NJ0IP wrote:
I have read lots of stuff on grounds and it appears to me that there is
nothing than anyone says or writes that isn't contradicted by someone
else,
elsewhere.
Bill Whitlock, Chair of the AES Standards Committee Working Group on EMC
(I am the vice-chair) laid it out quite well. You can study the extensive
tutorial material on his Jensen Transformers website. I've adapted his
analysis and models to what happens in the ham shack. You can see it in
the Power Point pdf on my website under the topic of Interfacing.
k9yc.com/publish.htm
The mechanism that puts AC buzz in our audio is power system leakage
currents. It has NOTHING to do with a "loop." Those leakage currents flow
on the green (ground) wire, and the resulting IR drop causes every chassis
to be at a somewhat different potential, and that potential consists of
the triplen harmonics of the power frequency. The difference between those
two ends of an unbalanced connection is simply added to the signal. The
interfacing tutorial shows this, and shows simple, inexpensive solutions.
73, Jim K9YC
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