Owen Duffy wrote in
:


Hmmm, replying to my own postings again!

This is a very detailed RLGC model, and it reveals from the P(x) line
that attenuation per unit length is not constant, a result of the loss
being higher in the region of a current maximum. Nevertheless, a
sampler that responds to Vf or Vr will not expose the true power curve
(due to the two missing terms).

The two "missing" terms are the second and third lines in the legend, the
crossproducts in the power equation expansion. In the case where Zo is
purely real, these terms are equal and opposite in phase and cancel out.

Owen