[Amps] Re: RE: 4CX250B Screen Supplies (Gary Schafer)

[Will Matney]

Exactly, and is my point here. Yes, two tones do produce some variance 
but that is what the test was around. What happens when you add voice 
with all the frequencies and harmonics like I'm speaking of? Does the 
IMD raise or stay the same? With the two tones, you'll have those two 
frequencies, their products from each because of mixing and some 
harmonics from each of them. Each multiple with a lower voltage than the 
center frequency which I assume your speaking of varying the current and 
voltage. Keep in mind though that still each are at a constant peak to 
peak voltage (each frequency with harmonics and products lower) because 
of the generators output and are unchanging each cycle. The voice will 
cause all these other frequencies to vary and thus be more "wide" spread 
than the test tone and the incoming peak to peak voltages each cycle 
changing. It was always my understanding that this is where the IMD 
problem came from. The two tone test shows so much, but like you said, 
the voice signal may be unmeasurable. However, I would like to know what 
it would be by using the different regulators with voice modulation. 
After all, we don't speak in two tones but all of them with 
differentiating volume. I'd still about bet it will raise it.

Will Matney

"Multiple tones could also be used rather than just two tones but that 
gets tough to unscramble as many more products are produced.

73
Gary  K4FMX"