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Looking through your e-mails I found something about IEEE having information available on RF noise. We're having problems with Seimens Variable Frequency Drives emitting noise and confusing our RS-485 signal to & from the I/O racks in a few pieces of equipment we currently produce. I would like to find material explaining what/how/where and what to do about it (including calculations). Can anyone help? D. Kalla Electrical Detailer PDQ Manufacturing, Inc (920)983-8333 ext 3537 [email protected]