Cecil Moore wrote:
You are silent on the subject of how the lumped-circuit model
explains more current at the top of the coil than exists at
the bottom of the coil. Please share that knowledge with us.

It's really very simple. It functions as a series of L or T networks
with series inductance and shunt capacitance. There isn't anything new
or novel about this.

I think I've done a good job of explaining things, and I've made
measurements and posted results.

Have you made measurements with 1/4WL added to the top of
a mobile antenna?

No, because it is outside the boundary of the antenna being discussed.
We have been talking about short loaded antennas. Not full sized
antennas, not inductors that are nearly self-resonant (tesla coils), or
antennas with distributed loading (helical antennas).

That's an entirely different topic.

Will you believe your measurements when
you measure more current "flowing" into the bottom of the
coil than out of the top of the coil?

If the inductor is nearly self-resonant or in a mode where flux
coupling is low compared to termination impedance, certainly odd things
can happen. RF plate chokes commonly go into modes like that when they
have large inductance to cover the bottom of HF, and have to function
at upper HF also. None of this is rocket science require standing wave
analysis.

As a matter of fact at the first series resonance an RF plate choke can
be accurately analyzed as a pair of back-to-back L networks.

This stuff really isn't new or fascinating Cecil.



It has been proven beyond a reasonable doubt that standing wave
current, func(kx)*func(wt) is not like traveling wave current,
func(kx +/- wt).

So what?

The issue was actual current flowing, not reflected wave current that
only would be a factor in a transient condition.

It almost seems like you are claiming we cannot measure the current
causing loss or causing radiation because of "standing waves". That's
nonsense of course, and I'm sure most people realize it.

Most people probably understand a current transformer will indeed
measure current that causes radiation and heat loss.

Then why can I measure a fixed inductor location in a dfixed antenna,
and range from no taper at all in current to just under 1/3 reduction
in current? Does you standing wave model explain this very repeatable
measurement?

Of course! If you measure the current taper at a point where the
standing wave current slope is near zero, you will measure near
zero taper. If you measure the current taper at a point where
the standing wave current slope is near maximum, you will measure
lots of taper. If you measure at just the right point, you will
measure current flowing into both ends of the coil at the same
time. That's another thing I have asked you to explain with no
response.

I can't explain a problem that exists only in your mind.

73 Tom