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Old 12th Jun 2019, 7:35 am   #194
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Default Re: Vintage Radios, TVs etc in films and on TV (not anachronisms)

Dragon's teeth pyramids of electromagnetic absorber are used in RF test rooms. It looks just like acoustic absorber. A single wall might be of use for testing signals from/to directional antennae like dishes and horns.

David
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