Possibly a ground loop thru the USB-C. Try running the laptop from its battery, no recharging PS.
WA0VYU
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On Mon, Jun 6, 2022 at 1:19 PM, Stefan<spommere@...> wrote: 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.
