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Trouble calibrating NanoVna Classic after upgrade to 1.2.20


 

I'm hoping someone can help me with my inability to calibrate my NanoVna
classic after upgrading
sucessfully to 1.2.20h.dfu.

While attempting to debug this problem, I did the following:

1) Ran a 'clearconfig 1234' via putty
2) Did a Touch Cal
3) Reduced the si535I frequency to 290 Mhz
4) Reset the calibration before starting the calibration process

But the nanoVna just wouldn't confirm a successful calibration when I
tested the Smith Chart with a 50 ohm or short load. I've attached an image
of what i see.

The odd part is that every so often the nanoVna does calibrate successfully
but when
I try and repeat the process it fails to calibrate.

Any clues? I love this little device and it is now a matter of personal
pride to get it to work!

Sanjay
AI6PM

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