Definition of what you are all waffling about :

"The input impedance Zo applies only for the duration of time taken
for an echo to be received back from the point where the line
impedance Zo first changes to another value.".

Distance can be measured either in metres or, if you like, fractions
of a wavelength. Wavelength involves frequency which is rather
meaningless because time is already a variable but on a different
arbitrary scale.

Only Cecil could dream up a use for such an effect.
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Reg, G4FGQ