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Yuri Blanarovich wrote:

Tom.
You tell that to the RF ammeters installed on the vertical, W9UCW's
pictures
on my page!

1.) I can build an antenna that has greatly uneven currents at the ends
of the loading coil, but the antenna rea above the inductor is wasted
and the system will be less efficient than a properly designed system.

2.) The meters are large and have a good deal of self-capacitance
compared to the capacitance at the point where they are connected, and
are directly connected to the antenna. Bad idea to base a whole concept
of how an antenna works on something like that.

You can mumbo-jumbo all the theory, you can dream of, but reality shows
that
in the say, quarter wave vertical, with loading coil the current at both
ends of the coil is different.

It can be different, but in a well designed system it is essentially
the same. The only difference is caused by displacement currents, and
that is a result of stray capacitance. Wind a good coil that has low
self-C to the outside world compared to the antenna hanging above the
coil, and the problem of large uneven current goes away.

Cecil explained the various situation
depending where the coil is placed within the radiator and at overall
antenna curve.

I doubt that. If he explained it in those terms he was missing some
important points.

Try this test, no meters necessary (perhaps the aquarium strip
thermometer):
Take your 80m Hustler antenna with Hustler loading coil and whip. At the
resonant frequency put about 600 Watts to it for a while. Stop
transmitting
and go feel (or read the temperature on the strips) the coil, bottom end
and
the top end. Same temperature? Temperature is proportional to the current
flow (same diameter wire) - warmer end - more current.

Are you saying thermal effects have no bearing?

It's getting pretty dangerous to write a theory based only on a Hustler
mobile coil with almost no stinger above the coil. One of the reasons
the Hustler works so poorly is the distributed capacitance in the coil
is large compared to the tiny stinger above the coil.

The Hustler has narrow bandwidth and poor efficiency because of the
coil design.

Then test two: Keep the RF flowing until heat shrink tubing on the coil
starts melting. Where does it melt first? Bottom of the coil or nicely
uniformly as you claim it should?

I never claimed uniformly in ALL coils. I set boundaries as to the
conditions. I can replace that Hustler coil with another coil and ruin
your theory about standing waves and missing antenna degrees.

73 Tom


Yea Tom, it all started with ALL coils, it is MY theory and you can ruin MY
theory. Riiiight! It's getting pathetic. Yea, meters are too big, Hustler is
crapy, Cecil is wrong, and you never claimed uniformly in all coils, just
those that you have. Reality is wrong, your "theory" is right! Rrrrright!!!
But what a coincidence that what W9UCW measured, jives with what Cecil
calculated. Hmmm!

ANSWER Cecil's question about his modeled example. I guess when someone is
stuck on something and dunt gitit, its tough!
I am just waiting how you will come around, dancing around in mumbo-jumbo
circles and then will become guru on how current IS different in the loading
coils. Happened in the past, will happen again. You are WRONG, reality
proves it, regardless of your detours.

BTW, what engineering degree, from what university do you have or PE that
gives you right to put labels like "JI Engineering" on your products?

bada BUm