> Very true! And if the separation between tones is down
> below, say, 100 Hz, then the power supply regulation (or
> lack of same) starts to enter into the picture. To test
> the RF
> block alone be sure to use separation of at least 1 kHz.
> But to test the entire system we have the dilemma of how
> to simulate voice.
That would require syllabic variations along with two tones.
It isn't difficult to do that.
> How pure does each tone of a tone pair have to be to
> check IMD using a two-tone test?
Do you mean for hum and noise?
73 Tom
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