Keith Dysart wrote:
It would be educational if you could describe one of these
experiments.

I already did - Bruene's early 1990's QST article.

Remember, you are looking for a re-reflection of the reverse signal
at a generator whose source (output) impedance matches the line
characteristic impedance.

It happened with your pet generator from which you quickly
tried to divert attention. Zero power dissipation inside
a "matched" source is hard to sweep under the rug, huh?

Either it works, or it doesn't.

Superposition works in some situations and doesn't work
in others. For instance, it doesn't work with power.
--
73, Cecil, w5dxp.com