John Smith wrote:
If you are truly laughing that loudly, you ARE an idiot.

Last night I did a Google search for "destructive interference
energy" and waded through about 50 web pages on the subject.
Needless to say, I found mass confusion, even among the "experts"
who are supposed to know the answer to the questions. However,
the opinions of the majority of experts matched Eugene Hecht's
concepts presented in "Optics" and the Melles-Groit and FSU web
pages that I have posted. In the absence of a local source, the
conservation of energy principle *REQUIRES* that energy "lost"
as destructive interference *MUST* appear as constructive
interference in the opposite direction in a transmission line.

We hams are usually interested in maximizing the destructive
interference toward the source, resulting in maximizing the
constructive interference toward the load. That is why we can
have 100 watts of source power with no reflected energy incident
upon the source AND 200 watts of forward power on the transmission
line. If the forward power into an impedance discontinuity
on the source side is different from the forward power out
of the impedance discontinuity on the load side, interference
has occurred with the destructive interference on one side
of the impedance discontinuity equaling the magnitude of
constructive interference on the other side.

Here is an interferometer with two outputs that can be
considered analogous to the two directions in a transmission
line. The more destructive interference that exists at the
standard output, the more constructive interference exists
at the non-standard output.

http://www.teachspin.com/instruments...eriments.shtml

"Using Dielectric Beamsplitters to find the "MISSING ENERGY"
in destructive interference - Where is the energy of the light
going in an interferometer adjusted for destructive interference?
Below is a schematic diagram showing a way to detect the non-
standard output of a Michelson interferometer—the light HEADING
BACK TOWARD THE LASER SOURCE. ... Quantitative detection demonstrates
that the standard and non-standard outputs of the interferometer are
complementary. That is, when interference is destructive at the
standard output, it is constructive at the non-standard output."
(CAPITALS emphasis mine)

The Z0-match point in a transmission line with reflections is
an interferometer of sorts. When interference is destructive
toward the source, it is constructive toward the load. All
of this is explained in my Worldradio energy analysis article:

http://www.w5dxp.com/energy.htm
--
73, Cecil http://www.w5dxp.com