Jim Kelley wrote:

Cecil Moore wrote:
Wave interference indeed
can cause a redistribution in the direction of energy flow.

Not correct.

Note I said "can cause", not "will cause".

Jim, you caused me to hit the books on cause and effect and
the effect was a refresher course on what I already knew.

From "Introduction to Logic", by Copi: "The word 'cause' is
sometimes used in the sense of necessary condition and
sometimes in the sense of sufficient condition."

Is permanent wave cancellation a sufficient condition
for a redistribution of energy to happen. The answer is "yes"
according to my web page references. Therefore, permanent wave
cancellation *will* indeed cause a redistribution of energy.

Please note above that I said wave interference indeed *can*
cause a redistribution of energy. I chose "can" instead of
"will" because wave interference is not sufficient to cause
the redistribution of energy. Wave cancellation is a special
case of wave interference in which the waves *cease to exist*
in their original direction of travel. The conservation of
energy principle dictates that the energy contained in those
waves before they are canceled, must necessarily be redistributed
along a different path. Note: Any different path in a transmission
line is necessarily the opposite direction, i.e. a reflection.
--
73, Cecil http://www.qsl.net/w5dxp

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