To calibrate your VNA cable, follow these steps:
1. Make sure the open end of the VNA cable is connected to a port on your VNA instrument.
2. Adjust the gain setting on your VNA instrument so that you are looking at the carrier frequency (f c ).
3. Connect an Ohm meter to the other end of the VNA cable and touch one lead to each metal prong on the Ohm meter's connector. Equalize the readings by turning off one power supply while keeping the other power supply on. The voltage reading should be around 9Vdc.
4. Repeat Step 3, but connect the other end of the Ohm meter to a grounded metal object such as a wall or bench. The voltage reading should be zero or very close to it. The closer the reading is to 0Vdc, the better your cable is functionally calibrated.