Re: "Beat frequency" phenomenon, but with 3 sine waves?

John Monro wrote:

...

A synchronous signal will demodulate it. Ordinary modulators won't change phase when the modulating signal changes polarity.

Jerry

Depends on what you call 'ordinary.' A double balanced modulator is an off-the-shelf component and it changes phase.

You're right again. I was back in the days of plate modulation.

Jerry
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