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Old January 2nd 08, 06:49 PM posted to rec.radio.amateur.antenna
Richard Clark Richard Clark is offline
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First recorded activity by RadioBanter: Jul 2006
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Default Standing-Wave Current vs Traveling-Wave Current

On Wed, 2 Jan 2008 05:04:17 -0800 (PST), Keith Dysart
wrote:

Given your previous writings, I suspect that you have
a solid understanding of the behaviour of an open-circuited
transmission line excited with a step function.


Hi Keith,

I do, but I haven't dwelled on the matter too much since my days in
RADAR where a Pulse Forming Network could provide a kick from a very
big bottled Thyratron. I can also in those early days recall an
inadvertent opening of a circuit to a constant current device -
another kick.

As for naming the multitude of combined stepped wave shapes, front
porch and back porch regularly make their appearances a Trillion times
an hour.

I simply couldn't wade through the myriad issues that you were trying
to pull together. I prefer to drill down on one thing at a time and
then bring them together. For instance, your last example of dueling
sources was clearly blighted and allowed for easy dismissal. However,
its inclusion was distinctly at odds with the other discussion which
reveals the hazard of the shotgun style of answering all of Cecil's
objections in one breath.

Cecil's crafted problems immediately fail with one detail, there is no
reason to pursue them all. One need only review the "purpose" of this
thread being
On Tue, 18 Dec 2007 09:33:23 -0600, Cecil Moore wrote:

There seems to be mass confusion even among the gurus on
this newsgroup as to the difference between standing-wave
current, as exists on a 1/2WL dipole, vs traveling-wave
current, as exists on a terminated antenna like a rhombic.

Clearly, Cecil was the most dazed and confused guru when I drilled
down on this "purpose" of his own choice, on his own terms. The
subsequent 450 postings have merely roiled in the seascape on sloshing
waves when this anchor of "purpose" was cast off.

Perhaps you could make an attempt at writing a clear
description of the behaviour of such a system in terms
of charge flow and storage. Since "wave" is a word
overloaded with meanings, it would be good not to use
it in the description.


I can appreciate your attempt to confine it to charge flow, but for me
that leading edge merely introduces a wide spectrum of RF rather than
restricting the topic. If I were to give any thought to the minutia
of current flow along infinitesimal sections, it has long since been
focused in the realm of coulomb blockades at the nano scale of quantum
dots, and where sound waves comfortably migrate in the 100s of THz. I
think few (make that zero) here are terribly interested in that
side-bar.

Once a clear description exists, I can extend it
using the same clear terminology to illustrate
the points of interest.


Methinks you are going to suffer it being ignored by the target of
your intentions (Cecil?). His affliction of Netzheimers only allows
any topic to be discussed to its logical confusion.

If, for the sake of lurkers, any topic merits an indepth study, it is
best left to publishing at a page. I committed several hundred pages
to fractals in the past, and Chip never manage to summon up more than
half a dozen; and certainly never any coherent theory. Drilling down
on the supporter's stated interest, on his own terms, almost always
rents open the seams of failure. Again, the points of interest I
elaborated on were consumed by the very few (maybe two, and mostly to
their astonishment of so much effort going to so much "so what?"). We
can all agree that the march of time has ravaged any millennium
aspirations of the dawn of the fractal age.

73's
Richard Clark, KB7QHC