Tom Donaly wrote:

...
Superposition doesn't work in the environment Yuri described. You've
been hanging around Cecil too long.
73,
Tom Donaly, KA6RUH

Better yet, in a mixer, where two frequencies are combined/mixed to come
up with a unique third freq which is then amplified, say to a KW, and
used to xmit a signal carrying data--well, this third signal is only a
figment of our imagination!

strange ... the power of imagination.

JS