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First of all, you ought to
realize that grounding, shielding, and electronic noise control is one of the
foggiest, most complex, and least understood areas of circuit design.
There are lots of books on the subject, but without an extensive background in
electrical engineering and calculus, there isn't much take-home information in
them.
Generally, however, best
practice is to ground a shield at only one end. Grounding both ends just
invites ground loop formation and subsequent noise generation. I've always
grounded at only one end, generally either the signal source, or the closest end
to the ground bus. It has worked for me. I think you have to assume
that whoever wrote the installation manuals that say ground both ends doesn't
understand grounding practice.
Jim Cameron
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