PicoVNA2 with python weird results under 1MHz

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Joined: Wed May 29, 2019 5:12 am

PicoVNA2 with python weird results under 1MHz

Post by andzux » Wed May 29, 2019 6:34 am


I have a problem.

I'm trying to use PicoVNA 106 with python according to https://github.com/picotech/picosdk-picovna-python-examples/blob/master/PicoVNAExamples/PicoVNAExamples.py and found few issues:

First - when It uses LoadCal(filename) it shows error but uses the cal anyway.
I know the file name is correct because if it is not correct it shows error and then says it will use default cal.

Second - the values in the range under 1MHz are not the same as in the PicoVNA2.
I connected leads together and in PicoVNA2 program it shows around 0dB in S21 mode but when I use everything the same in python it shows -90dB.
But everything over 1MHz is the same.

Has someone encountered the same kind of problems?

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