Re: S21 and S12
It's my understanding that these NanoVNA cannot do an S12. You have emulated S12 by building in support for xfer relay functionality. Right?
I am not seeing how to select a one port calibration. How?
Selecting the two port calibration without a xfer relay would entail putting the shunt and load on port A when it asks for port B because it thinks there is xfer relay installed. These vna's can't put out a signal through port B, right? (I realize I'm repeating myself. The omission of this in manual seems like a big deal to me). Please set me straight about my understanding.
Yes, the manual includes details about adding a transfer relay in order to measure all four S-parameters. If you tell the software you have a transfer relay by assigning a valid port number to it, it will attempt to use it. This includes calibration.
I wrote the software this way because I am lazy. I don't want to have to tell the software if I have the relay installed or not. If its there I want Windows to tell me it's there and use it.
***
Also, that last video I posted for the Lite demonstrated how to use the transfer relay.
***
If you are curious why I have an enable selection for the stage controller but not for the transfer relay, the USB adapter I use for the transfer relay is dedicated hardware. The only time it is installed in the PC is when I am using it. The stage uses a USB adapter that I use to interface with other peripherals. In that case, it is very possible that it may be installed at the time start the software.
I could have chose to do something similar for the transfer relay but again, I didn't want to have to select it every time I wanted to use it. Again, lazy.