Decades ago, when I was a systems test technician on the big IBM
mainframe computers, it was very important to have all gounding systems
(logic ground, power ground and frame ground) separated for the first
sections of testing. Then, at a point when all the critical checkout was
completed, they were bonded together at ONE point. This was specifically
to eliminate ground loops. It's the same principle. I'd like it if the
ARRL Handbook did a better job of covering how ground loops are formed
and how to avoid them.
73, Duane
On Mon, 19 Apr 2004 21:35:49 -0500 Robert & Linda McGraw K4TAX
<RMcGraw@Blomand.Net> writes:
> Ground loops in any system are serious problems. Often they manifest
> themselves as humm or buzz in audio, which to most, indicates that
> poor
> grounding exists and thus more grounds are needed. Quite the
> opposite is
> typically true! If one has a ground loop problem then it is
> reasonable to
> conclude that more than one ground path exists.
etc . . .
Duane Calvin, AC5AA
Austin, Texas
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