On Tue, 09 Aug 2005 12:53:40 -0500, Cecil Moore
wrote:

Jim Kelley wrote:

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

Not correct.

There you go again, playing semantic games, and trying to force
your pet definition of "cause" on the rest of the world. You
have obviously tried to redefined cause to mean "first cause",
a concept that has so many holes in it that you can use it for
a sieve.

By saying the above, you are disagreeing with the following web page:
http://micro.magnet.fsu.edu/primer/j...ons/index.html

What you don't seem to grasp here is that's exactly the
same as saying 'a standing wave pattern causes energy to be
redistributed'.

The existence of standing wave indeed does cause energy to be
redistributed. Where the standing wave voltage is zero, the net
energy is redistributed into the H-field. Where the standing wave
current is zero, the net energy is redistributed into the E-field.
It is all because of the standing wave. If the standing wave didn't
exist, that wouldn't happen. Therefore, standing waves cause
energy to be redistributed. A causes B. B causes C. C causes D.
Of course, the standing waves are only one item in a cause and effect
chain. The standing waves are an effect caused by interference between
forward-traveling waves and rearward-traveling waves. The forward-traveling
wave is an effect caused by a source. The rearward-traveling wave is an
effect caused by a mismatched load. The source and the load are caused by
human beings. The load is caused by human choice. Humans beings are caused
by ... See where your "first cause" concept leads? i.e. nowhere!
Snip
Here's your logic once again. Lightning hits my ICOM and fries it.
Was lightning the cause? No. Was a low pressure depression the
cause? No. Was whatever caused the low pressure depression the
cause? No. There must have been something before that. Maybe the
proverbial butterfly flapping its wings in China? See how
silly your argument is?

Jim, try the following on for size:

Let us now determine why open or short circuits are developed by
wave interference. From King,37 we know that voltage and current
traveling along the line can be represented by individual generators
placed at any point along the line. Those generators are called "point
generators." For the purpose of analysis, a point generator is an
impedance-less EMF that can represent or replace the voltage and
current on the line equal to the voltage and current actually
appearing at that point on the line, without disturbing the wave
action on the line.
To simulate and analyze interference between two waves of equal
magnitude and opposite phase traveling in the same direction, such as
the two sets of reflected waves generated by the load mismatch and the
stub mismatch, we can connect two point generators together in either
of two different configurations. Each generator replaces the voltage
and current of each individual wave at the point of interference, the
match point. In the first configuration, the two generators are
connected in phase. Because their voltages are equal and in phase, the
differential voltage is zero, resulting in no current flow. This
connection is equivalent to an open circuit between the generators. In
the second configuration, the generators are connected with their
terminals reversed. Their voltages are now in opposite phase at the
interference point and the resulting voltage is the sum of the
voltages delivered by each generator; i.e., twice the voltage of each
generator. This connection results in a short circuit between the two
generators.
Identical wave-interference phenomena establishing a short
circuit also occur in free space in the same manner as in guided-wave
propagation along transmission lines. For example, when the fields
emanating from two radiators in an array of antennas are of equal
magnitude and 180° out of phase at a point in space, a virtual short
circuit is established by destructive wave interference, resulting in
a null in the radiation pattern at that point. Following Poynting's
Theorem, the energy in the combined fields propagating is reversed in
direction at that point; and with the constructive interference that
follows, that energy adds to that in the fields propagating in the
opposite direction, thus achieving gain in the that direction.

Walt, W2DU
..