Roy Lewallen wrote:
When the forward and reverse traveling waves are equal in
magnitude, the amplitude distribution -- that is, the "waveform" if you
plot magnitude versus position -- is the absolute value of a sine
function. For all other cases, it's described by hyperbolic trig
functions. So the "jump" from time to position involves more than phase;
it also involves a change in waveshape.

Exactly! That's why the current waveforms through the coils
are not perfect cosine waves. To maintain the same forward
and reflected power, when the phase between the voltage
and current changes, their amplitudes must change accordingly.

Conservation of energy dictates that V*I*cos(A) must remain
constant (assuming no storage) so if the (A) angle changes,
voltage and current magnitudes must change accordingly.
--
73, Cecil http://www.qsl.net/w5dxp