Frank wrote:
The problem with some of the other parameters is that
short and open circuits are required to obtain the data.
This can cause instability in active devices.

And that, in a nutshell, is why Keith's analysis
is invalid for real-world ham transmitters. In
a real-world transmitter, incident reflected
waves do not flow through the source like they
do in the model in the human mind.
--
73, Cecil http://www.w5dxp.com