Jim, I think that we have a case of my saying that the bottle is half
empty and you saying it is half full.

The way I learned it was, that transmitter peak power - 100% - is the
reference. This is achieved with 100% voltage. Idle (quiet) operating
point is 70% voltage which corresponds to 0.7*0.7 = 49% power. The minimum
power is another 30% voltage down from 70%, at 40% voltage, which
corresponds to 0.4*0.4 = 16% power.

This means that the pk-pk amplitude of the transmitted sine wave will vary
with modulation between 40% and 100%, with the average (when quiet) at
70%, and not more than that. Or, if you want to, 100% +/- 30% for another
way of referencing. This is also what you will see with a scope in the IF
strip of a receiver, and what I see with a scope in the IF strip of a
receiver. Note: NOT in a communications receiver.

I hope that I made myself clear enough that this is about broadcast
service, i.e. AM and SW radio stations you tune into using a commercial
receiver.

Peter

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