Jim Kelley wrote:
It's hard to imagine how Rs (Zs) could have any effect on that ratio.

Here's an interesting quote from _Transmission_Lines_, by Chipman, page 175:

"Equation (8.27) demonstrates explicitly that the shape of a standing wave
pattern representing |V(d)| as a function of d on a transmission line is in
no way affected by the quantities, Vs, Zs, and rho(s) at the source."
--
73, Cecil http://www.qsl.net/w5dxp



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