Oristo,
Thanks for your information abt. the serial port, actually I am using a version 3.1 comport and sofar I saw no problems in comunicating with theNano VNA-H4 , with the firmware as supplied by Alibaba.
This problem was sollved by executing a new device stand alone calibration and saving it to CH0 of the device.
Best Regards
Jos
Op 26-1-2020 om 14:03 schreef Oristo:
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it appears that at start NanoVNA-Saver is using the C0? calibration of
Yes
NanoVNA, untill now I thought these calibrations were independant.
No, USB serial communication from nanoVNA to Python is not reliable for
all firmware, USB cables and versions of Python.
Using a USB 2.0 (rather than 3.0) port e.g. by hub sometimes helps.
Adding ferrite beads to USB cable may help.
Some firmware and Python serial implementations are simply flakey.
Rune's workaround is to depend on nanoVNA C0 calibration returning data values nearly correct.
