In article ,
M. J. Powell wrote:
In message , James
writes

Now, my question. If you send this signal into a standard FM Rx it
will produce a tone.

Why? The two frequencies do not exist at the same time in the receiver.

But if the shifting, the pulse repetition, is taking place at a high
enough frequency it will be heard as a tone. And, yes, the information
is still there because the waveform of the tone should be that of the
modulating signal.

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jhhaynes at earthlink dot net