On Sat, 13 Aug 2005 16:57:52 -0500, Cecil Moore
wrote:
some people use that exact same argument to try to prove
that no current is flowing in the middle of a transmission line
Or uncanceled reflections brighter than the sun are black.

Richard Clark wrote:
Cecil Moore wrote:
some people use that exact same argument to try to prove
that no current is flowing in the middle of a transmission line

Or uncanceled reflections brighter than the sun are black.

In a lossless system sourced by monochromatic
coherent light, if the 1st medium is air and if the
index of refraction of the 3rd medium is the square of
the index of refraction of the 1/4WL 2nd medium, then
all reflections are canceled in the 1st medium. That's
one of the rules of optics for non-reflective coatings.
--
73, Cecil http://www.qsl.net/w5dxp

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Richard Harrison wrote:

Cecil, W5DXP wrote:
"Net current doesn`t flow."

How much current flows into 400.000 ohms?

Let's take a look at a simplified system. The SGCL source is
a signal generator equipped with a circulator and load resistor.
Each segment in the following 50 ohm lossless coax is 1/4WL long.

|--------1.25WL 50 ohm coax-------|
200W SGCL------A------B------C------D------short

The signal generator is sourcing 200W and the circulator load
resistor is dissipating 200W.

What is the net current at the short and at A and C?

What is the net voltage at D, B, and the source?

What is the forward power and reflected power?

What is the net current at the signal generator output?

What magnitude of current is the signal generator sourcing?

What magnitude of current is flowing through the circulator
load resistor?

What is the phase difference between the forward current and
reflected current?
--
73, Cecil http://www.qsl.net/w5dxp

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On Sat, 13 Aug 2005 22:34:38 -0500, Cecil Moore
wrote:
then all reflections are canceled in the 1st medium
"all," of course, if you discard precision to force the theory to fit
the expectations.
About as respectable as E = M · C² ±3dB

Richard Clark wrote:
Cecil Moore wrote:
then all reflections are canceled in the 1st medium

"all," of course, if you discard precision to force the theory to fit
the expectations.
About as respectable as E = M · C² ±3dB

Given an ideal system with carefully selected boundary conditions,
all reflections are canceled. That is a concept, not something
that can be achieved in reality. Your height and weight on your
driver's license is not 100% accurate either but it is good
enough for government work.
--
73, Cecil http://www.qsl.net/w5dxp


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On Sun, 14 Aug 2005 07:23:56 -0500, Cecil Moore
wrote:
Your height and weight
±3dB? All the expectation of a Dr. Atkins diet.