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Coax Cable Test Help - RF Cafe Forums
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Post subject: Coax Cable Test Help
Posted: Fri Sep 29, 2006 11:11 am
Joined: Fri Sep 29, 2006 11:05 am Posts: 4
Hey everyone !
I have a cable assembly that I would like to get some test data on. Instead of the usual Type N to Type N, I have a daisy chain of Type N to Type N "Tee" to Type N. I can connect to 3 locations but my VNA only has 2 ports. What could I do to test this assembly for an accurate VSWR or IL measurement ?
Posted: Fri Sep 29, 2006 4:03 pm
Joined: Sun Aug 03, 2003 2:02 pm Posts: 476 Location: Erie, PA
You should be able to terminate one arm of the assembly in a calibrated 50 ohm load (since that is what a 3rd VNA port would present) and test two ports at a time.
I assume you realize that your described configuration will present 25 ohms (assuming you are using 50 ohm cable) to all ports in the assmebly since each port will "see" two, 50 ohm impedances in parallel.