> Real modulator voltages have to start somewhere as a
> reference. If we take .1 volt P to P to deviate a PM
> exciter to 5KHz of deviation at a 1KHz audio tone,
> then it will take 1 volt P to P to drive the same
> modulator to 5KHz deviation at 100 Hz of audio. I
> think everyone will agree with this so far.
You're limiting "real" modulators to varactor designs? Just because
that's what *some* of our aging land mobile radios use doesn't make it
the only kind of PM modulator.
> So, even theoretical PM falls apart when you get down
> to really low modulating frequencies.
No, you're wrong, theoretical PM doesn't fall apart until you reach DC.
Real-world implementations are what might fall apart. Math doesn't fall
apart at low frequencies.
For your varactor example I agree with your math Joe, and that it would
be impractical to get 0.01 Hz response out a run-of-the-mill two-way
mobile, but that's about as far as you can go without crossing the line
between practical and theoretical.
--- Jeff
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