Cecil Moore wrote:
Gene Fuller wrote:
Cecil Moore wrote:
You missed the point. A terminating capacitor is a two
terminal network. The point where two pieces of feedline
are connected is a four-terminal network. A two-terminal
network is different from a four-terminal network.

This appears to be an unusual definition.

Not unusual at all, Gene. The two input terminals to the
black box are on one side. The two output terminals from
the black box are on the other side. The impedance
discontinuity is inside the box. The black box is extremely
small.

Give me the four s-parameters, s11, s12, s21, and s22
and I can tell you virtually everything about what is
inside the black box without even applying a signal.


BZZZT! Wrong answer.

Nobody ever said anything about the "other side" of the black box.
Everything has been referenced to "the point where two pieces of
feedline are connected."

Nobody is trying to suggest that what is inside one black box is
identical to what is inside another black box. The only thing known is
that the *two* accessible terminals to each of the black boxes show the
same specific impedance at the given frequency. Nothing else. Yet by
your models and math the black boxes don't behave the same in your test
circuit.

You still have not addressed the original question posed by Keith.

73,
Gene
W4SZ