Note that my post upon which you both commented was based on a SYSTEM
evaluation, and was not restricted to the performance of a coaxial cable
having a given mismatch condition, used between the transmitter output
terminals and the antenna input terminals.

Also note that few, if any, transmitters can safely deliver their rated
r-f output power into a load SWR of 3:!.

This is true no matter what is the power rating of the transmission line
type used in an antenna SYSTEM with a 3:1 SWR.

RF

You are probably correct concerning a 3:1 SWR. Transmitters
usually have to meet full output into a 2:1 SWR, all phases, with no
sign of oscillation. In this case I had assumed that a matching network
would be used between the PA and coaxial input.

Frank