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Here is a great set of link about RFI, grouding, common mode currents both for audio and ham use. http://www.k9yc.com/publish.htm

Beat me to it. I was just going to post that link.

Worth noting, Jim recently was given a technical service award by the ARRL for his work. http://www.arrl.org/news/arrl-technical-service-award-confer...