Quote:
Originally Posted by colortrakker
When CBS went color, they picked Norelco cameras to avoid using anything from their arch-nemesis, RCA. The Norelco cameras lacked proper RF shielding, so had to be modified with a mu-metal coating to keep the images from going wacko. Not long after that, CBS switched Sullivan to Marconi cameras, which were much better insulated against RF. By 1973, they went back to the Norelcos.
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The mu-metal was for low-frequency magnetic fields produced by the subway equipment, not for RF.
RF interference was encountered when remote cameras were taken to the balcony of the Empire State Building. Even if the camera was well-shielded for RF, it could get in through the lens to the pickup tube faceplate signal electrode.