Richard Clark wrote in
:

On Mon, 26 Feb 2007 20:38:00 GMT, Owen Duffy wrote:

The danger in the "power is refelected at a mismatch" explanation, is
that it follows that power reflected at a mismatched antenna flows back
toward the transmitter and is at least partially absorbed in the PA as
heat. Though that is a popular belief, it is not supported by fact.

Hi Owen,

This denies experience.

Do you mean the experience that the PA may (but not necessarily) run
hotter on other than its rated load impedance?

Could that be exlained without introducing transmission lines and the
reflected power issue by examining how the PA works on a load different
to its rated load?

I suggest that if a PA / line / load situation transforms the actual load
to some arbitrary impedance Z at the PA end of the line, the PA will
peform exactly as if the PA were directly loaded by a lumped constant
load of Z. The explanation of any heating effects or changed operating
voltages is in the effect of the load impedance Z (however it is
obtained) on the PA.

Does that make sense?

Owen