Cecil Moore wrote:
Jim Kelley wrote:
In what way are any of the questions relevant to, or deterministic of
the assumption?

Answering a question with a question is a well known
diversion. Please answer my questions and you will
automatically answer yours.

One could claim that the questions exemplify your point about diversion.
:-)

Here's some mo How can a current that changes
phase by 3 degrees in 90 degrees of wire be used
to measure the EM wave delay through the wire?
How can that current be used to measure the delay
through a coil positioned in the middle of that wire?

Assuming the antenna is 90 degrees in length, the relevant currents can
be measured, the maximum is known and the minimum is zero, then:
According to the plots that I've seen, the standing wave pattern will
show a discontinuous change in amplitude at positions where there is an
abrupt change in phase of the traveling waves. Since it's fair to
assume propagation velocity is the same in both directions, waves would
be phase delayed by the same amount in both directions at a
discontinuity, and the combined sum of the two delays would account for
the total delay and for the resulting change in amplitude. Since a
standing wave can be considered an amplitude vs phase plot (where both
phase and amplitude vary with position) and the amplitude is known on
both sides of the discontinuity, the amplitude on each side of the
discontinuity relates functionally to a corresponding phase on the
abscissa of the standing wave curve. The total change in phase is equal
to the difference in phase on the two sides of the discontinuity. The
phase delay for each traveling wave is then half the total phase change.
Whether all of the assumptions are true for the cited case, I don't
know. The assumptions that you've made are not always clearly or
completely communicated, but would obviously weight heavily in the
results. This is also true for EZNEC results.

Why not take some actual phase shift measurements for yourself?

73, ac6xg