"Reg Edwards" wrote:
But the propagation delay, with a true transmission line, should be
constant versus frequency as it depends only on coil dimensions and
hence on L and C. The velocity factor should also be a constant.

Reg, if the SWR on a piece of transmission line is infinite and one tries
to use the standing wave current phase to measure the propagation
delay in a piece of that transmission line, what would be the result?
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73, Cecil, W5DXP