Richard Harrison wrote:

Cecil, W5DXP wrote:
"Given two coherent waves traveling in the same path with the same
magnitude and opposite phases, wave cancellation results from
destructive interference."

The waves don`t cancel out. Anything in their path just receives equal
and opposite influences and the effect of the waves is nil.

I assume you are not asserting that canceled waves' effects become
nil, i.e. undetectable, until the end of time yet they still possess
the same amount of energy as always except now that energy is completely
undetectable for the rest of the life of the universe. Consider the
ramifications of what you are asserting.

Seems to me, canceled waves must *cease to exist* at a point in space-time
if they exhibit zero measurable evidence of their existence forever after
(plus exactly that same amount of energy is required by the system in the
opposite direction).

Incidentally, that was Dr. Best's argument. The energy in the canceled
waves continues to propagate forever in the opposite direction of the
load. Never mind, that exact same amount of energy is required for constructive
interference in the opposite direction and cannot just be created out
of nothing. That's when he left the newsgroup.

For constructive interference to exist, energy from destructive interference
MUST be supplied from somewhere real, according to Hecht in _Optics_.
The conservation of energy principle agrees with Hecht as it
did during the spring of '01 when the arguments were raging between
Dr. Best and me. There is still not enough energy only in P1 and P2 to
make P1 + P2 + 2*(P1*P2) equal to the forward power. The 2*(P1*P2) is
known in the field of optics as the "interference term" and obviously
is supplied from destructive interference between two reflected waves.
--
73, Cecil http://www.qsl.net/w5dxp



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