Richard Harrison wrote:
Roy Lewallen, W7EL wrote:
"Certainly, the total V and I are in quadrature if the line is
terminated by an open, short, or purely reactive load. But not in any
other case."

Something else is at work. The reflection reverses direction of the wave
producing a 180-degree phase shift in either voltage or current, but not
both, if there is a reflection. Because the waves are traveling at the
sane speed in approaching each other, they produce a phase reversal in a
distance of only 90-degrees instead of 180-degrees. This places the
waves in quadrature to stay.

Seems you two are arguing about two different things.

If Z0 is purely resistive: Pure standing waves are *ALWAYS*
in quadrature, i.e. the sine of the angle between V and
I is always 1.0. Pure traveling waves are are *ALWAYS* in
phase or 180 degrees out of phase, i.e. the cosine of the
angle between V and I is always 1.0.

In a mixed environment of standing waves and traveling
waves, the angle between V and I can assume any value.
--
73, Cecil http://www.w5dxp.com