ruffrecords wrote:

To produce FM there needs to be a non-linearity. If you detect FM there
is a good chance a non-linearity exists. But it is not due to the
doppler effect.

Exactly, and until an experiment is done which eliminates
all other driver non-linearities an experiment hasn't been done.


Bob
--

"Things should be described as simply as possible, but no
simpler."

A. Einstein