"ruffrecords" wrote in message

Jim Carr wrote:
Here's a link that you tech folks can argue about:

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




Looks good to me. Plenty of evidence of harmonic distortion (casued
by non-linearites

Agreed.

and no evidence of 50Hz sidebands arounf the 4KHz signal.

What do you call the spikes around the 4,025 Hz carrier in, for example

http://www.pcavtech.com/techtalk/dop...1-1-1+10dB.gif

Doppler distortion is dead.

Nope. If I bandpass filter out everything from 3,800 Hz to 4.200 Hz and then
clip it into a near-perfect square wave, of course any AM is history. There
then remain 4 very clear sidebands at 50 Hz intervals around the carrier.