Yuri Blanarovich wrote:
Roy,
please see my other posting, otherwise, I really promise to do the step by
step article, which will try to explain, correlate real life measurements
and modeling and present the comprehensive case of current being different
across antenna loading coils. Will do that with cooperation of other
"defenders" that contributed to "our" cause. There is no point of going back
and forth on tangents. We will measure, show the reality and then apply some
theory, explanation and summary of what is going on.
I hope it will correct misconceptions, provide better understanding and
benefit in proper modeling and design of loaded antenna elements and
systems.
Otherwise, I think we have reached point, when it is pointless to go around
in circles and argue that what IS, CAN'T BE, because.....

Before you get too carried away, look back in this thread where Cecil
posted a URL to his web site where he had an EZNEC (helical wire) model
of a coil at the base of a short whip. It showed significant current
drop from the bottom to the top, although no significant phase shift. I
replaced the whip part of the antenna with a wire directly to ground
from the top of the coil which contained a lumped RC to substitute for
the whip's impedance. The drop across the coil remained the same. So in
the course of developing your theory, you should explain why this
happens, since there are no longer the traveling and standing waves
which were on the whip. This model was, and still is, posted on my web
site. Then, to illustrate that the current drop from bottom to top is
due to shunt C, I removed the ground in the model, converting the model
to free space. I connected the bottom of the coil to the bottom of the
new wire with a wire instead of via the ground connection. The current
drop from bottom to top of the coil disappeared. (There's still a minor
difference due to several factors I mentioned in my posting.)

The fact that the current drop is the same for an antenna and for a
lumped circuit with the same impedance was also verified by measurements
I made and posted over a year ago.

Those model results are consistent with what I, Tom, and others have
been saying, and consistent with classical, known, circuit theory. They
aren't consistent at all with all this standing wave - traveling wave -
antenna replacement business. I've looked very carefully at the models
and concluded that EZNEC is operating well within its capabilities, so
the results are valid.

So for starters, why don't you explain how your theory fits with the
existing model results? Why is the current drop the same with an antenna
and for a lumped circuit? Why does removing ground make the current drop
go away? Why is there no significant phase shift in current from bottom
to top? Conventional theory can explain this. Can yours?

As for your promise to write the article, I have to point out that
you've made this promise before without delivering. So I'm not exactly
holding my breath waiting for it. I'm sure it'll make interesting
reading, though, and it's a revolutionary enough theory that the IEEE,
or at the very least QEX, should be happy to publish it when it's
finally complete.

Roy Lewallen, W7EL