Cecil Moore wrote:
Jim Kelley wrote:

On Mar 29, 7:33 pm, Cecil Moore wrote:

Unless it is located at a
physical impedance discontinuity, absolutely nothing happens
because of the V/I ratio.


The last half of the sentence is absolute correct. The V/I ratio is a
result, not a cause.


Yep, I didn't say that very well. Let me try again.
EM wave energy in a transmission line can only change
directions at a physical impedance discontinuity.

Accordingly, the fraction of energy that changes direction at a
physical discontinuity is dictated by the physical constants of the
physical discontinuity; index of refraction in the case of optics;
impedance in the case of transmission lines.

73, Jim AC6XG