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Old April 5th 06, 03:29 PM posted to rec.radio.amateur.antenna
Cecil Moore
 
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Default Current across the antenna loading coil - from scratch

Ian White GM3SEK wrote:
Cecil Moore wrote:
Everybody seems to understand how a coil works.


Crucially, you don't. The main property of a "coil" is inductance, and
at the most fundamental level you do not understand what inductance does.


Please stop the mind fornication, Ian. I understand how a coil works
and I agree with you how a coil works in a lumped circuit or a traveling
wave environment. It's obvious that our basic disagreement is NOT about
coils but is, instead, about standing waves. If one doesn't understand
standing waves, one cannot understand standing waves in empty space, in
a wire, or in a coil.

Take away the coil leaving nothing but wire. You and I still disagree
regarding traveling waves Vs standing waves. Take away the wire and leave
nothing but empty space containing standing waves of light. You and I
still disagree regarding traveling waves Vs standing waves. Let's discuss
our point of disagreement, not something that we agree upon.

Very few people understand how standing waves work.


Once again: crucially, you don't. You demand that ordinary electrical
phenomena (like inductance and even current) change their properties or
definitions in the presence of standing waves.


I just posted some tabular current data from EZNEC. EZNEC says that
current changes its properties in the presence of standing waves.
It's there in black and white for all to see. Please explain how
those two columns of data are identical.

The traveling wave current magnitude is constant over the entire
90 degrees of wire. The standing wave current magnitude is a cosine
function over that same 90 degrees of wire.

The traveling wave current phase changes linearly over the entire
90 degrees of wire. The standing wave current phase is unchanging
over that same 90 degrees if wire.

That doesn't look the same to me. In fact, one could make an argument
that traveling wave current and standing wave current are opposites
of each other.
--
73, Cecil http://www.qsl.net/w5dxp