That's an interesting setup. I would start with a two-port S21 Response calibration.
?
Not sure what VNA you're using. My 8510+8515A won't go that low of frequency but if yours are similar to 8510,
it's?
1) press CAL
2) Select CAL kit(I think any calkit will do for your setup)
3) Press S21,
4) Select "Calibrate Response"
5) Connect thru
6) Press "Thru" standard key.
7) Done and save CAL Set#
?
Then measure S21.?
?
Good luck!
Calvin
?
