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Zenith had a device they called "the growler" for testing analog TV sync circuits. It was a metal box with RF input and output ports that contained a vacuum cleaner motor coupled to the signal. ...
When the ATSC high def digital over the air systems were tested, one of the tests was a vacuum cleaner motor that made RFI. To see how well the transmission methods handled it.
10-21-2018, 06:37 PM
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