Note: the above plots are uncalibrated to show the amount of noise of the raw data from the hardware. The performance starts to degrade before 2GHz, and would not have passed our standard QC procedures for the earliest 3GHz V2.2 version. Here is the S11 trace noise compared to the original S-A-A-2 (NanoVNA V2.2) and Plus/Plus4 versions. What we saw was worsened noise, nonlinearity error, and temperature drift issues. The earliest V2.2 version (before Plus4) that all clones are based on was designed for 3GHz only, and some clones try to extend the frequency range using harmonics without understanding the design, while substituting lower quality or counterfeit parts to reduce cost. We tested a few clones of the NanoVNA V2 design, some claiming higher specifications than the original. See official stores above and look for NanoVNA V2 Plus4 versions only to avoid getting a bad clone. Some users have also reported software/firmware incompatibility. Safe places to buy an original NanoVNA V2:Īs of February 2022 there are many clones sold under various names, many of which do not meet specifications and are highly noisy due to using incorrect or lower quality parts.
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