Rich,
Current calibration is calculated per frequency point so no relation whatsoever with any other point in the scan.
See here:
/g/nanovna-users/wiki/Application-Notes for the harmonic switch frequencies
I do see however very different behavior once the nanoVNA switches to harmonics mode but this does not influence the regular calibration currently implemented.
At low frequencies the bridge correction model is fairly easy as its impact is in sync with the rotation of the S11 angle. At higher frequencies the observed impact gets out of sync with the observed S11 angle so I am wondering what mechanism causes S11 impact depending on a cable (the rotation speed versus frequency is roughly proportional with the length of the cable) but with a different rotation speed?
I'm observing a sin(f)*e(f) effect
Could this be the cable capacitance????
--
Erik, PD0EK
