They had something not right in that Faraday cage, if you had noise
inside. Of course, copper does not adequately block low frequency
magnetic field components, and that likely was the source of your
noise. Our ACE rooms at Southwest Research were doubled steel panels..
Same for the anechoic chambers at Dell Computers in Austin. They have a
30m room that is also lined with anechoic foam as well as being solid
walls of metal. It even has an air tight remote controlled
pneumatically powered door. It is acoustically and RF quiet!
K5KVH, Austin TX
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