How to measure the characteristic impedance of coaxial cable using NanoVNA?

I am going to use the method described by S21RC on his website to measure the characteristic impedance of a coaxial cable using NanoVNA. For this Port 1 of the NanoVNA is being used. 50 ohms dummy load and appropriate connectors and crocodile clips when needed are being used along with the Smith chart in NanoVNA.