On Dec 29, 8:05*pm, Roger wrote:
Cecil Moore wrote:
Roger wrote:
Are there reflections at point "+"? *Traveling waves going in opposite
directions must pass here, therefore they must either pass through one
another, or reflect off one another.

In the absence of a real physical impedance discontinuity,
they cannot "reflect off one another". In a constant Z0 transmission
line, reflections can only occur at the ends of the line and only
then at an impedance discontinuity.

Cecil, this sounds more like a pronouncement from God than like an
conclusion from observations.



Does this match your own concept of the traveling waves acting at the
{+} point Cecil? *If not, where do we differ?

Where we differ is that you allow traveling waves to "reflect
off one another". There are no laws of physics which allow
that in the absence of a physical impedance discontinuity.
EM waves simply do not bounce off each other.

I am not aware of any laws of physics that prevent it either. *I don't
see any evidence that it happens in open space, like light bouncing off
light. *It might happen on transmission lines however. *I just cannot
find any convincing evidence either way. *What I have deduced so far
indicates that it makes no difference which happens.

Maybe both things happen (both reflect and pass). *This because the EM
field travels very close to the speed of light. *It is a little hard to
see how one wave could "see" the other coming. *On the other hand, the
charges move slowly, far below the speed of light. *It is easy to see
how they might "see or feel" each other coming.

Consider the electric field, for example. Like charge,
two fields of the same polarity will exert a force on
each other. Arguably, this is the same force that
charge exerts.

Also consider that field lines never cross. It would
therefore seem impossible for the two electric fields
associated with two EM waves to pass each other
without interaction. Just like the places on the
transmission line where the voltage or current (and
therefore power) is always zero, there are places in
space where the E or H field (and therefore power) are
always zero.

And whether the wave in space is viewed as passing
or bouncing, the results should be the same, just
as it is on a transmission line.

...Keith