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Coaxial Cable

Posted by Triode_Kingdom on April 29, 2012 at 19:43:23:
Coaxial cable does in fact produce small, non-linear phase shifts and reflections that vary with frequency, even when properly terminated. This is due, I believe, to variations in physical tolerances along its length and perhaps also chemical makeup. I have measured these anomalies in the past, and while they are insignificant for most purposes, a sensitive nulling mechanism with a dynamic range exceeding 60dB or so can detect the effect of these disturbances as variations in input impedance.