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Old April 1st 06, 12:54 AM posted to rec.radio.amateur.antenna
Cecil Moore
 
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Default Current through coils

Richard Harrison wrote:

Rot, W7EL wrote:
"From all that, I gather your answer is Yes."


I believe the wave is guided by the wire in its path and takes no
shortcut along the axis of a coil.


If 100% of the flux from each and every coil physically linked
100% of each and every other coil, the current would indeed skip
from one end of the coil to the other without interference. That
is the basic presupposition of the lumped-circuit model.

Quoting Dr. Corum:
"Lumped element circuit theory assumes that there are no wave
interference phenomena present, ...", i.e. no superposition
of forward and reflected waves, i.e. no standing waves.

Continuing the quote:
"This is manifested by two phenomena: 1. The current distribution
function is spatially uniform across each element. 2. The spatial
phase delay between circuit extremities is zero."

One has to imagine that W8JI's 2" dia x 12" length 100 uH coil
links 100% of the flux in coil number 1 with coil number 100
a foot away and vice versa. That's quite an imagination but W8JI
did measure a 3 nS delay, virtually instantaneous, so it must
be true.
--
73, Cecil http://www.qsl.net/w5dxp