Owen Duffy wrote:
"Distortionless lines" are lines with purely resistive Zo, and they
include lossless lines and that class of lossy line.

Re rho 1, Chipman is not talking about "distortionless
lines". He specifically states that it occurs when the reactive
portion of Z0 is of opposite sign to the load reactance.
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73, Cecil http://www.qsl.net/w5dxp