Hello.
If I connect a cable to the NanoVNA and calibrate OSL at the end of that cable, and measure the same cable, I should get 1 small point to the right of the Smith chart when the cable is open, or 1 small point to the left when the cable is shorted.
This happens if I calibrate in the NanoVNA device and use the internal calibration.
But this does not happen when calibrating in the NanoVNA-App. After calibrating with the 5-meter RG223 cable in the NanoVNA-App, something goes wrong. Smith is rotating backwards.
In addition, the last measurement point is significantly different from the previous ones, and this last point looks correct.
OPEN:
893250375 7,452017665e-01 6,873174310e-01
895500250 7,410393953e-01 6,873663068e-01
897750125 7,427099347e-01 6,907842755e-01
900000000 1,001433492e+00 3,330142936e-03
SHORT:
893250375 -7,893709540e-01 -6,558784842e-01
895500250 -7,710666060e-01 -6,550329924e-01
897750125 -7,579773664e-01 -6,538544297e-01
900000000 -1,000591993e+00 -2,029109281e-03
If I do the calibration without a cable, directly on the SMA socket of the NanoVNA, the graphs do not show anything disturbing. Probably the error also exists but is so small that it is invisible.
NanoVNA-App version 1.1.209 +OD12 from OwenDuffy,
NanoVNA-App version 1.1.213 released 2023-01-22 from DiSlord has the same issue.
NanoVNA-H4 firmware 1.2.19 from DiSlord
Is this a bug or am I doing something wrong?
