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Inconsistent VSWR readong #calibration


Stefan Pommerenk, W6SPO
 

Hi,

I have a MFJ-259B antenna analyzer and now also a NanoVNA-H, along with the NanoSaver App.

I get inconsistent VSWR readings with both devices:

MFJ: 1.8
NanoVNA not connected to laptop via USB-C: 2.7
NanoVNA connected to laptop via USB-C: 1.1

The VSWR reading on the NanoVNA literally goes from 1.1 to 2.7 when I unplug the USB-C cable from the NanoVNA.
I went through call calibration steps at least a half dozen times on the NanoVNA for 50kHz to 900MHz, and for the 40m band (7.0 MHZ - 7.3 MHZ).

Any suggestions as to what value I should actually trust ?
I wonder if I need to calibrate the NanoVNA through the Saver app separately; based on what I've gathered, it should not be necessary.

Thanks for any advice.

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