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Old March 22nd 06, 02:39 PM posted to rec.radio.amateur.antenna
Cecil Moore
 
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Default Current through coils

Ian White GM3SEK wrote:
I flatly do not accept your notion of a special kind of "standing wave
current" that has its own special kind of phase properties.


We already know that, Ian. Please drag out your dusty math book
and try to understand the difference between the standing wave
current function, func(kx)*func(wt), and the traveling wave
current function, func(kx +/- wt). They are obviously different.
Calling the standing wave current a "current" is something of
a misnomer since it doesn't exhibit the characteristics of a
normal current at all. What are the implications of a "fixed
phase" for a current, i.e. its phasor doesn't rotate?

Do you disagree with Gene's technically accurate posting on the
subject?
************************************************** ***************************
Gene Fuller, W4SZ wrote:
In a standing wave antenna problem, such as the one you describe, there is no
remaining phase information. Any specific phase characteristics of the traveling
waves died out when the startup transients died out.

Phase is gone. Kaput. Vanished. Cannot be recovered. Never to be seen again.

The only "phase" remaining is the cos (kz) term, which is really an amplitude
description, not a phase. The so-called "phase reversal" in longer antennas is
not really about phase either. It is merely a representation of the periodic
sign reversal seen in a cosine function.

************************************************** ****************************

The current that the loading coil experiences is plain old ordinary
alternating current flowing in the wire ...


False! Standing wave current is different from DC, AC, or RF
traveling waves. Please take time out to understand the
implications of a non-rotating phasor for a current. All other
AC currents have rotating phasors but the standing wave current
phasor doesn't rotate all up and down a 1/2WL thin-wire dipole.
That makes it extremely different from any other AC current.

Any special kind of current that requires electronic components to
behave in some different way from normal is simply not real.


The forward current and the reflected current are not special. The
superposed standing wave current doesn't behave as normal current at
all. It's phase doesn't change along the entire length of a 1/2WL thin-
wire dipole. I have said this a dozen times and it hasn't yet soaked
in yet so I will continue to repeat it. What does unchanging phase imply
about a standing wave current? All other AC currents change phase.

You have a fundamental misconception of what a standing wave of current
really is. You repeat all the words about "standing waves", "cos kz",
"scientific logic", "laws of physics" etc; but you don't actually let
any of it into your mind.


I am open-minded, Ian, and use the scientific method to correct my
mistakes and thus zero in on the technical facts. One of a guru's
presuppositions is that he already knows everything. I have no
such misconceptions about myself.

All the questions you ask other people are rooted in your own
misconceptions. In other words, the questions are rigged so that they
cannot be answered except by agreeing with you.


No, Ian, my questions are rigged so they cannot be answered except
by agreeing with the laws of physics and gurus cannot afford to show
their ignorance of the laws of physics. That leaves them between a
rock and a hard place as far as answering my questions are concerned.
That's the only reason for the "Silence of the Gurus".
--
73, Cecil http://www.qsl.net/w5dxp
 
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