Other major players in the NanoVNA space do not share their design files, and all are working on competing V3 (6GHz) designs. The S12 can achieve over 90dB of port isolation below 3GHz, allowing measurements above 6GHz use harmonics. However, only HCXQS is supporting the original developers. 2022 LibreVNA 2.0 The LibreVNA vector network analyzer provides a updated 6-layer PCB design which optimizes the S12 port isolation and high-frequency port matching. S-A-A-2 design is open source, which means anyone can manufacture it. The linearity and dynamic range are improved. S-A-A-2 does not use harmonics it uses 2x ADF4350 to cover up to 3GHz. S-A-A-2 is a completely new design not based on the original NanoVNA by ttrftech.
None of them check for things like uncalibrated directivity. All Aliexpress and eBay sellers are selling clones which have fancier packaging but lack QC on the RF characteristics and performance can vary. Only US73.99, buy best S-A-A-2 NanoVNA V2 50kHz - 3GHz 3.2 Inch Large Screen 3G Vector Network Analyzer S-A-A-2 NanoVNA V2 Antenna Analyzer Shortwave HF. EDIT: - Only the Tindie store and RTL-SDR blog store support the original developers and fund the development of V2/V3 and maintenance of the firmware and software. The USB interface is similar to the NanoVNA in that it passes commands over a virtual serial port. The UI code is kept mostly intact (other than porting to C++11) while the low level infrastructure and signal processing code are rewritten. I was the layout and RF engineer on the nanovna V2 team. The NanoVNA V2 firmware is based on ttrftech’s NanoVNA firmware.
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