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Hi , some figures describing the most common calibration possibilities of a VNA.

Dave, Et Al; Thank you for the comments and teachings. I updated my antenna system configuration and the VNA measurment testing setup strategy based on a compilation of all these comments.

QUOTE: My question is type of "just checking" question. All the directions for the various vna's say to do the OSL at the vna port. I guess they assume anything connected after that is the DUT. When

You always want to calibrate at the end of your test cables, or somewhere in your test setup as close to the DUT as possible. The nanovna's have a large calibration range.

My question is type of "just checking" question. All the directions for the various vna's say to do the OSL at the vna port. I guess they assume anything connected after that is the DUT. I also asked

That is one way. The simpler way is to ignore it. A 2:1 VSWR harms nothing on the transmitter side, adds inconsequential loss to the system, and is of concern only to those who pursue the holy grail

We are still talking past each other. I am describing the losses incurred by a piece of coax cable under two conditions: matched, and with a 2:1 mismatch at the load. Those losses are independent of

I made a document for *beginners* but it is in French. You have to *download* it and submit it to Google to get the

Fran?ois: Thank you. I appreciate the lessons.

Indeed, but you are ignoring 2 important factors; 1) the tx does not match the cable impedance, Your examples assume a matched source with all of the reflected power absorbed, and 2) how the PA reacts

Your port1.s1p file shows that your measurement is very bad. All points must be inside the circle. You need to learn how to use your NanoVNA on **much simpler** cases. Don't forget to do a RESET on

OK. Let's get back to the original post intention. Design the proper matching network and deal with it. SimSmith has embedded solutions for designing matching networks based on the impedance of

Roger’s one-port method is indeed applicable beyond the “stated” 50 ohm regime, as endorsed by Patricio, within reason. I imagine Leif M meant to write “use series through method with S21

William, you are absolutely correct that Dave is absolutely correct in his points. Neither of you are addressing the subject of this post. Warren Allgyer - WA8TOD

Suggest you see message #8675 for some classic RF plate choke responses. These are simple S11 one port and are representative of both bad and well behaved plate chokes. In particular shown is the old

Brian, Here is a screenshot and sp files.

I got a right angle SMA connector that RG-316 typically solders into. I ran a wire about 3 inches long through the opening to the SMA center pin and soldered it there. I ran another wire of the same

This is the right way to measure with VNA.

The reactance can be much less than 50 ohms and much greater than 50 ohms and you will still get good results. Here is a measurement of an inductor that measured 9.8 uH at 100 kHz. on a DE-5000 LCR

The Smith Chart is the best display to view potential problems. Whenever the locus crosses the center horizontal line on the chart, it is resonant at that frequency. To the left of center is likely