On May 10, 8:40*pm, Richard Clark wrote:
On Tue, 10 May 2011 17:14:56 -0700 (PDT), Richard Fry
wrote:

On May 10, 7:00*pm, Richard Clark wrote:
Another way of putting it is saying the ringing line is holding 10W
until it is dissipated. *So far, only the antenna qualifies as
dissipation.

Apparently you have never had to repair the components of a
transmitter PA, an output network, or a transmission line that arced
over and/or melted down due to load reflections (coherent, or not).

Not more than a quarter million Watts, fur shure. *Does it show?

Seriously, if that was your only rant, based on that snippet, like
Wim, you have just indicted your own witness (experience?).



RF

73's
Richard Clark, KB7QHC

To Richard C:

Richard, I must totally disagree that the same degree of mismatch
occurs at the tx output as at the dissipative load, the antenna. As I
have said many times, with the non-dissipative output source impedance
of the RF amp (tubes) the reflection at the junction of the line input
and the pi-network output is total. In other words, all of the
reflected power incident on the output of the pi-network is TOTALLY re-
reflected. Can't be anything less!

To Richard F. And I disagree that the load mismatched at 2:1 absorbs
88.8889% of the forward power. It is 90% !!! We are discussing steady-
state values, in which arrival of the first forward wave is
irrelevant. If you are so confident that the number is 88.8889%,
please derive the conditions that yield that number.

I never thought I'd be having this discussion.

Walt