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Old March 9th 06, 05:51 PM posted to rec.radio.amateur.antenna
Cecil Moore
 
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Default Current through coils


"Wes Stewart" wrote
if you go he

http://www.k6mhe.com/n7ws

and look at either Note 1 or 2 and then look at figures 1 and 2 this
might change your mind about the current distribution.


Nobody is disputing the current rise through a coil. In fact, I have
been pointing it out. The coil does distort the current away from
the nice cosine envelope of a 1/2WL thin wire dipole.

Your graphs show standing wave current which doesn't flow. (Its
phase angle doesn't rotate.) Therefore, the magnitude of the standing
wave current can be any value depending upon where it is located in
the system. Wes, please take a look at http://www.qsl.net/qrzgif35.gif
to find out why standing wave current can have any value and is thus
unimportant. EZNEC plots the current in much the same way that
you have. So are the EZNEC results wrong and yours right? The
fact is that a standing wave current plot is close to meaningless.
Why are we continuing to discuss standing wave current?

What we need to plot is the forward traveling wave current and
the reflected traveling wave current which are the two components
of your standing wave current graphs. Do you have any simulation
software that will plot the forward current and reflected current?
Nobody is going to understand what is really happening until we
get a plot of those two component waves or at least an estimated
graph of the underlying superposed currents.

In fact, how about your best estimate of a graph of forward and
reflected currents through the coil including phase shifts? Only
then are you likely to understand what we are talking about..
--
73, Cecil, W5DXP


 
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