Transmitter (Was: RE: OT Mitsubishi Monitor Weirdness)

From: William Donzelli <>
Date: Sun Mar 10 17:51:03 2002

> I agree with what you say here, even for the vintage of the
> transmitters. They were built in the 40's & 50's. It was
> even fascinating to see how the technology worked. To modulate
> a portion of the RF with low frequency (ranging from 30 to 90 hz)
> there was two RF coupling loops with a specially designed fan
> blade spinning between the loops. This changed the amplitude
> of the RF coupled from one loop to the other.


William Donzelli
Received on Sun Mar 10 2002 - 17:51:03 GMT

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