On May 3, 6:29*pm, John KD5YI wrote:
I believe his confusion is the one-port vs two-port problem. I don't
have a problem with your explanation. But, I think he is throwing in a
port where he should not.

The second port is actually there on the other side of the black box,
but it has been overlooked. Doesn't it give anyone pause to realize
that the s11 parameter changes by an infinite percentage depending
upon whether it is measured as a one-port system or as a two-port
system? If that can happen with a passive black box, consider how much
more complicated it might be with an RF source included in the black
box.
--
73, Cecil, w5dxp.com
"Halitosis is better than no breath at all.", Don, KE6AJH/SK