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Hello everyone!
I have found the difference between Internal calibration on device and calibration on nanovna-saver.

I was calibrate on pcb by soldering/desoldering open stab/short 0402 resistor (0 ohm) and 50 ohm 0402 resistor. When I do this by internal device calibration it successfully done.

But if I try to do this in nanovna-saver then I keep error “two of short, open and load returned the same values at frequency ...”. For more control of this process I had sweep every steep and looking for the graphics. It all was different for every step open/short/load.

How can I fix this?
And does any way to take internal files of calibration in nanovna2 and use it in nanovna-saver?

Hi,
I'm facing the same issue with my new NanoVNA V2 and NanoVNA Saver version V0.3.10 under Win64.

In 9 out of 10 calibration attempts I get the following error message:
“two of short, open and load returned the same values at frequency ...”

This is really annoying - does anybody have an idea if this is a hardware or a software issue on my device?
Calibration on the device itself works fine but with the V0.3.10 on the PC it's a nightmare.

BR,
Markus

I get the same error,! I use the calibration assistant . If I do it with out the assistance I get the error .
The software is the issue, if I do the device no problem.

I cannot upgrade the firmware anymore because the driver for Dfu mode does not work any more , I guess there is no more support ! ;(

Clear your calibration on the device, measure your standards
while the device is in an uncalibrated state.
Essentially check if your standards and device are functioning properly.

Just a thought, you might want to try the OneofEleven PC program as an alternative to VNASaver.
Using that same program, you can also directly install firmware upgrades to the device.

Hi , if you do the calibration without the assistance , you must do a sweep before "click" on the device .
Maurizio IZ1MDJ