"Arny Krueger" wrote in message


The only way to verify this is to look at the phase as well as the
amplitude of the sidebands.

That's one way, but it's a very hard row for me to hoe.

So, you decline to believe that the relative amplitudes of the
sidebands are different and relevant, as the frequency has increased?

BTW, I added some simulations of the triple tone test, showing the differing
results for AM and FM distortion.

The simulations have a darker blue-green border around them, while the lab
measurements have a lighter blue border.

http://www.pcavtech.com/techtalk/doppler/

Between the differences in the sideband structure and the amplitudes of the
first two sidebands, it seems like this triple-tone test might have some
general application. I'm thinking about jitter testing...