Jim...All good points.
Yes, I have been thinking about a dedicated nanovna and fixture and the various options needed for different cable types. For the multi-channel snakes the VF is pretty similar as the construction and materials is similar. This would be the main use. And the stimulus scan frequencies will probably require changing as well.
I would like to make this as easy for individuals with varing technical experience. It might necessitate a PC connection but I have not researched that aspect...very new project.
Single mic cables can have a VF much lower, I've measured some less than 50%.
And yes the impedance is as you mention although manufacturers don't always specify except for AES/EBU whis in nominally 110 Ohms.
