Richard Clark wrote:
"The point of the challenge was to illuminate the invalidity of claims
that the usual Ham transmitter does NOT exhibit 50 Ohms and that any
power returning to it from a mismatched load is reflected fully back
toward the load."

The impedance a transmitter presents to a reflection is seldom
advertised as far as I know. I think it could be measured.

If a matchbox exists between the transmitter and the line, it may be
adjusted to get the most out of the transmitter. If so, this match
should prevent a reflection from reaching the transmitter. If the
reflection doesn`t reach the transmitter, there is no place else for the
reflection to go other than for another go at the load, given low losses
in the matching and feeding systems.

Best regards, Richard Harrison, KB5WZI