Jim Kelley wrote:

Cecil Moore wrote:
Nope, nothing "wrong". I just avoid making assertions when I'm
not 95% certain that I am correct. Thus, most of the time, I am
unresponsive. I am 95% certain that the average humongous mobile
loading coil is not "physically small" and is more like a
certain percentage of a helical antenna which indeed does
obviously demonstrate a net current gradient.

It's certainly true that such a coil is not 'electrically' small.

And it seems to me that most of the coil models assume "physically
small" coils which leads me to my next question. Are there no models
for "physically large" coils? The arguments involving "physically
small" coils are only valid for physically small coils. What about
all the other coils in the world that are not "physically small"?

Seems to me that a helical antenna functions approximately the same
above ground or in free space. Where is the virtual ground in free
space?
--
73, Cecil http://www.qsl.net/w5dxp



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