Hello there, My project is a Smith Chart calculator/simulator that takes the Zo and ZL of a transmission line and calculates various data like SWR, SWR(dB), return loss, coeff I, E, P, etc. It also constructs and plots on a graphical Smith Chart. I want to take this one step further and retrieve my Zo and ZL from a REAL transmission line. I want to connect a coax cable via an usb to coax adapter and send a signal through my computer to determine these properties. I need some ideas/guidance on this. Should I do this via the USB port? I think essentially I need to make a TDR to retrieve data such as E incident and E reflected. It would be ok if I am not able to determine Zo for now and just use a data sheet. But I would like to retrieve data to calculate ZL and then send that data to my program. Thanks so much in advance for your help!