The NanoVna seems to work but when I look at results on the PC screen I can't see the Smith chart. I see results plotted on the screen, probably on the Smith chart but Smith chart itself is not visible.
This is a Windoews 7 32 machine with a ordinary 27" inch screen. PC software gives this info(probably about the device): Kernel 4.00 Build time 2. Aug 2019.
