John You're welcome. My _Go_To_ book is "Electromagnetic Compatibility Engineering" By Henry W.Ott. Published by WILEY. http://ca.wiley.com/WileyCDA/WileyTitle/productCd-0470189304.html I've retained perhaps 5% and for a while the book went everywhere with me as I tried to absorb the details. It's not black magic although it appears that way sometimes. John Dammeyer
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