15070000 -1.000470519 -0.000045675
15194750 -1.000452399 -0.000081647
15319500 -1.000464559 -0.000072501
15444250 -1.000433683 -0.000034980
15569000 -1.000416160 -0.000060047
15693750 -1.000486493 -0.000025182
15818500 -1.000452280 -0.000066847
Jim, that's a data sample for the short. The real part is consistently beyond -1.0004. The open is similarly beyond +1. The largest |S11| I found in other .s1p files was 1.0037. I think it is some sort of systematic issue, not noise. Most users will never notice it since the effect is so tiny. My application is sensitive to errors at extreme S11 values, which yield nonphysical results (negative conductivity).
I forgot to mention that the VNA firmware for the open and short was DiSlord 1.2.
Brian
