Keith Dysart wrote:
I assume that you have not provided a reference to support
this assertion because you have not been able to find one.

I provided the reference a number of times and you
chose to ignore it. The reference is the chapter on
interference in "Optics", by Hecht.

Unfortunately optics do not do well at explaining
transmission lines since they do not extend down
to DC.

On the contrary, most physics books on "Light" do
indeed extend down to DC. I'm surprised you don't
know that. "Light" and "visible light" are two
entirely different subjects. "Light" covers all
EM waves all the way down to DC.

I have yet to find anything about transmission lines
that needs constructive and destructive interference
for explanation.

Well, there's your entire problem in a nutshell. If
you don't ever look for something because you don't
"feel the need", you will never find it. Please don't
blame anyone else for your feelings. And you are not
alone. My mother never "felt the need" to understand
anything except God.

I am unsure why some are content to constrain
themselves to solution techniques and explanations
that only work on the special case of sinusoids.

Sinusoids are a test of your comprehension level.
Because we know if you cannot even comprehend the
most simple case, you have no hope of comprehending
anything more complicated. Don't feel bad. My
girlfriend cannot comprehend sinusoids either.
--
73, Cecil http://www.w5dxp.com