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A very useful PC application for the NanoVNA was developed by One Of Eleven as an alternative to NanoVNA Saver and other earlier programs. It was originally done for personal use but was kindly offered to the community. After development was stopped by the author the source code was released so that improvements could be done by others. The program is easy to use and has many nice features... - Multiple graphing options and flexible scaling options. - Calibration works reliably and includes averaging and smoothing options - Built in firmware uploading tool that is easy to use - Continuous run mode which is useful for tuning filters and antennas - Four memories that can be used to compare results in the graphs - Export and Import of Touchstone files (s1p and s2p) - Multiple marker capability with various display options. DiSlord and Owen Duffy have made several recent improvements and bug fixes. The updated program can be downloaded here >> https://github.com/owenduffy/NanoVNA-App/releases The program is mouse driven and by right clicking on any graph you can change the tiling options (# of graphs on screen) and the type of graph (SWR, RL, Reactance, Smith etc.). Please post any questions about how to use the program in this topic. Roger

NanoVNA has a port renormalization function (called Port Z, see DISPLAY->PORT Z: 50) that allows you to see the measured S parameters at other port impedances. But since NanoVNA is only available for measuring S11 and S21 parameters, the following assumptions are made for renormalization: S22 = S11 and S12 = S21, i.e. the DUT is symmetrical. To simplify the calculations, a non-complex impedance value is used and the new impedance of both ports is the same. And now the question is to what extent it is necessary to make calculations for different values ??of port impedance, because then the DUT is not symmetrical?? and the assumption that the S22 = S11 and S12 = S21 are equal is not true. Or this can be useful?

I have a NanoVNA-H4, I have no problems checking antenna SWR etc. But what I want to do now is to check the performance of a "Diplexor" You know one of these things that splits/combines a 2 meter and 440 antenna into one common output. You know one of these. https://www.dxengineering.com/parts/dmn-mx72d?seid=dxese1&srsltid=AfmBOorYLOCQdZje08Kz0wOkDVIXNgAUhA_L0yFz09dCrJpwlHKyHOy7b_g <https://www.dxengineering.com/parts/dmn-mx72d?seid=dxese1&srsltid=AfmBOorYLOCQdZje08Kz0wOkDVIXNgAUhA_L0yFz09dCrJpwlHKyHOy7b_g> I want to measure the insertion losses for each band. and then the amount of isolation between the bands. Can anyone show me a video on how to do this? OR give me a step by step on how to do it? Joe WB9SBD

On my H4, I recently started having a problem calibrating. During cal the smith chart is sweeping wildly displaying a lot of straight angled lines about the cursor. In the end the cal fails as evidence by measuring the cal standards. This started after flashing firmware to H4 dislord 1.2.40 though I suppose it could be coincidental. I opened it and checked for cracked solder joints but didnt see any. Then I flashed it a few more times, testing in between, and finally after 2-3 attempts it started behaving normally again. Has anyone else seen this before? Maybe I had some setting botched? Bryan, N0LUF

HI to all I own a FY6900 device, a cheap but very complete generator (mine is the model working up to 60mHz). Till now I've used it only with an oscilloscope, but I would like to employ also with a NanoVNA Anyone has done so? I think should be very useful for my tests (i.e. building filters). Thanks for any suggestion 73 Gabriele, I4JXE

When I am constructing an antenna, I have been using this device to plot the swr in my shop. I usually set a wide enough bandwidth to easily see the dip at resonance. In the shop, connecting this device directly to the SO239 connector, the sweep on the screen is perfect. But in testing with the antenna installed with coax, and testing at the end of the feed line, the sweep seems strange. See attached