Hello, A discussion has come up about the need to raise the horn antenna up to 4 meters when doing an EMI test above 1 GHz. ANSI states that the antenna height should be adjusted between 1-4 meters to maximize the emissions. Some labs are only doing this test at 1 meter or maybe 2 meters high, (probably to reduce cable loss issues). Normally, the emissions are worst case below 2 meters, but how can one be absolutely sure, without checking? What is the legal requirement for the antenna height? These questions apply to unintentional radiators, where measurement above 1 GHz is required. Regards, Tim Pierce - 2005 IEEE Symposium on Product Safety Engineering 3-4 October Schaumburg, IL http://www.ieee-pses.org/symposium
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