Richard Harrison wrote:
If I recall, he said a short on a line vitiates capacitance at that
point. It shorts it out.

But there is NO actual short. The ratio of voltage to current is not
even zero. The ratio of voltage to current at a Z0-match point is Z0.

The discontinuity is essential to the turnaround.

Exactly! That's how b1 = s11*a1 + s12*a2 gets to equal zero. s11*a1 and s12*a2
are both reflections from the physical impedance discontinuity. No "virtual
short" required. s11*a1 and s12*a2 are reflections that are equal in magnitude
and opposite in phase.
--
73, Cecil http://www.qsl.net/w5dxp
"One thing I have learned in a long life: that all our science, measured against
reality, is primitive and childlike ..." Albert Einstein



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