Don Bowey wrote:

...
This will not happen in a properly designed transmitter. It is not a
characteristic of AM.
In fm, it is not unusual for a small "amplitude modulation" to be
generated, as the varying/spanning of freq(s) is caused by the
modulation, some changes in fm carrier can be generated.

In an imperfect world, nothing is "perfect."

Regards,
JS


Listen to a "strong--pure am signal" on an fm receiver, turn up the
volume on the fm receiver, something is responsible for that ... repeat
experiment with the reverse ... "imperfect world theory" proof!

In new equip (I started out decades ago, remember) voltage regulation,
filters, suppressors have much improved ... digital processing is king
and allows what analog never could achieve ...

Regards,
JS