Hi Andy,
if you are able to do a little Math, you can use an S21 through measurement to measure an impedance.
Only issue: there is in the moment no software available for the nanovna to do the calculation. With the DG8SAQ VNWA the software supports this measurement as well as much other analysis modes. For the nanovna we will have to wait, if somebody implements it into the firmware (e.g. the Smith diagram for S21 could do the math) or software.
Some calculations: with 70dB noise flour and usable 60dB dynamic range of S21 (up to 300MHz) using a divider X to 50Ohm you could roughly calculated measure up to 50kOhm (60dB is a 1/1000 voltage divider, 50K Ohm and 50Ohm roughly give 1:1000)
shows that for high impedance S21 serious through and for low impedance S21 shunt through should be used. In between the S11 reflection method delivers good values.
vy73 de Karsten, DD1KT
