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I spent a lifetime in the electronics industry and while I knew of the effects of ground loops I never had any bother other than noise on secure data lines and this was cleaned by screens and single point earthing.
One interesting problem we often had with poor grounding was with mains equipment that had input filtering on the mains lines. If you did not have a good ground the gear would sit at half the mains voltage with respect to ground. Quite shocking!
Our G11/Gemini has no problems and runs in the field from the generator that also supplies a number of computers, telescopes, heaters, cameras etc.
Barry
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