Cecil Moore wrote:
Jim Kelley wrote:

Cecil Moore wrote:

What I said is the voltage and
current in a standing wave are *always* 90 degrees out of
phase and it is impossible to generate heat when the voltage
and current are 90 degrees out of phase.


So then shouldn't one expect coax to be heated uniformly along its
length at a high SWR?


No, any and all heat is work done by traveling waves, not
standing waves.

Perhaps you misunderstood the purpose of the question. Traveling
waves are basically uniform in amplitude along the length of a
transmission line. Why would any heating associated with a traveling
wave anything other than uniformly distributed?

As long as standing waves exist as standing
waves, they are incapable of doing work or heating anything.

You, of all people, should appreciate that since V*I*cos(90)
equals zero for standing waves, absolutely no work can be
performed by a standing wave. If the energy in a standing
wave is used to provide work, the standing wave ceases to
exist as it does at key-up.

In trying to get any work out of V*I*cos(90)=0, blood out
of a turnip comes to mind.

I have a piece of coax around here somewhere that I once burned up. I
recall telling you about it. The insulation is bubbled and melted at
half wavelength intervals. Please explain what particular aspect of a
traveling wave might have caused that to happen.

Thanks and happy new year de ac6xg