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Old June 5th 10, 08:22 AM posted to rec.radio.amateur.antenna
Szczepan Bialek Szczepan Bialek is offline
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First recorded activity by RadioBanter: Oct 2009
Posts: 707
Default Question about "Another look at reflections" article.


"Keith Dysart" wrote
...

I tend to agree. Wave is an overloaded term and this leads to some of

the confusion. There are some phenomena that transport energy which
have a wavy nature. This does not mean that every thing with a wavy
nature is transporting energy.

In particular, it does not mean that when there is a situation in

which
energy is not being transported (e.g. a zero on a transmission line),
that just because the conditions on the line can be described by
decomposing into two waves going in opposite directions, that these
two waves are.

Also each pulse in the wave is carrying energy.

Attempting to do this, and believing that these decomposed waves

actually represent energy flows leads to having to answer questions like
"where
does the reflected energy go"? When I first started lurking in this
group about a decade and half ago, the 'obvious' answer accepted by many was
that it went in to the final and fried the tube.

Members of this Group should know that in microwave oven are the standing
waves, In the Manual is " when the amount of food is small, sharp points and
sharp edges on metal objects can initiate a corona discharge, a "Saint
Elmo's Fire," which behaves the same as a flame and can set fire to the food
and the oven if allowed to continue for long. Aluminum foil can become a
blow torch!"

Each pulse of the both waves travelling in the opposite direction is
carrying energy. The energy cummulate and can destroy the tube or the oven.

Many have moved beyond this simplicity, but some have not yet moved as far
as they need to.


It is important to know that the standing waves are possible only in
compressible medium.
"Maxwell's equations" are for the incompressible electricuty.
S*