Thread: Facts
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Old November 20th 04, 05:02 AM
Cecil Moore
 
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Gene Fuller wrote:
Again, how do you know the "reality" for your transmission line in free
space?


Simple, we know the characteristics of copper wire and we know the
dielectric properties of a vacuum. Examples abound in textbooks.

This is a straightforward question. Do you have data?


Of course, don't you? If not, maybe you had better get some.

You have many times made similar remarks about us "stupid folks" who get
misled by math models. How do you get your information?


The distributed network model was developed because the circuit model
failed in systems that are an appreciable portion of a wavelength. I'm
surprised that you don't have that information.

As for the E- and H-fields, this just gets more amusing by the minute.


The attenuation factor for the average transmission line at HF is almost
entirely due to the resistance in the conductors as the shunt conductance
is usually negligible. Resistance in the conductors causes a voltage drop.
Yet, we know that the current is attenuated by exactly the same percentage
as the voltage. Since G is negligible, R must be responsible for the
decrease in current. What laws of physics can account for that fact?

Z0 determines the ratio of HF voltage to HF current. Therefore, if the
voltage drops and the V/I ratio stays constant, energy must be transferred
from the H-field to the E-field. That's pretty simple stuff, Gene, maybe
sophomore level.
--
73, Cecil, W5DXP