On Jun 13, 5:04*pm, Richard Fry wrote:
On Jun 13, 2:58*pm, walt wrote:



To Richard Fry,

Richard, it appears that you have ignored my post where I reported
data that proves the output resistance of Class B and C RF amps
is non-dissipative.

I know your conclusion, thanks Walt.

The impedance of a perfect transmission line also is non-dissipative,
but that does not change the power dissipated in a termination of that
transmission line equaling its Zo.

Do you agree that the Mendenhall paper I have quoted shows that the
source impedance of an operating Class C vacuum tube PA and its output
tuning/matching network designed for a 50 ohm load is not, by itself,
a functional 50+j0 ohms?

RF

No Richard, I've not made that inference. The point I'm emphasizing
is that because the output resistance of these amps is non-
dissipative, no reflected power from a mismatched load enters the amp,
but is totally re-reflected in the forward direction. I make no
comment on whether the output resistance is 50 +j0, because when all
the available power is being delivered at given grid drive the output
resistance equals the load resistance, which doesn't have to be 50 +
j0. Proof of that is that when the load resistance is either increased
or decreased the output power decreases.

Walt, W2DU