On Sun, Mar 5, 2023 at 03:23 PM, Roger Need wrote:
OneOfEleven developed the NanoVNA App for personal use and after moving on to
other projects kindly posted it as open source for the community to use and
modify. Owen Duffy has created a fork of the OneOfEleven App and corrected
some of the errors in the program especially on the info sidebar.
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My suspicion is that something is wrong with the implementation of the cubic
spline interpolation in NanoVNA App. Perhaps DiSlord or Owen Duffy will
consider adding linear interpolation as an option and removing or fixing the
cubic spline interpolation.
Well that was quick! Owen Duffy has released a new version of the NanoVNA App using linear interpolation and it gives almost identical results to my stand-alone NanoVNA-H4. Thanks Owen for doing the update and sharing with the community. You can read about the update at the link below.
You can download the latest release OD13 from GitHub:
I took OD13 for a test drive today and compared the measured results against NanoVNA-H4 calibration and NanoVNA App calibration. Measurements for both were done with 8 time averages and trace smoothing set to 1. The same 3M coaxial cable as my other posts was used with calibration and testing done at the far end with the SMA pin receptacle test jig posted earlier.
Four screenshots are attached:
1. 50 ohm SMD cal load
2. 100 ohm SMD resistor
3. 1000 ohm SMD resistor with R-jX and R//jX plots
4. 47 pF SMD capacitor.
Roger
Roger Need
