Jim and Dan, thanks for the comments and suggestions. I ran Zplots TL
params on data from my TAPR VNA and saw no unusual results. I rescanned
the cable with the RigExpert but viewed the data on AntScope2 software
which showed the step response reflection coefficient stayed at zero.
AntScope has a specific cable parameter selection for FSJ4 cable, while
the RigExpert unit itself does not (it only permits selection of a
limited set of cables and velocity factors). I suspect the anomaly is
due to the algorithm or parameters stored in the unit being different
from those in the PC software. I sent an inquiry to RigExpert but don't
expect to hear back given the situation in Ukraine. Meanwhile I will
proceed on the basis that the cable is in good condition.
73, John K7LY
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