Fun facts, you can build your own VNA from scratch using open source GNU Radio toolkit with any off-the-shelf SDR platform for example using the low-cost ADALM-Pluto or you can go fully gung ho with the more capable RFSoC platform [1],[2],[3],[4]:<p>[1] Lab notebook of experiments in GNURadio:<p><a href="http://www.swigerco.com/gnuradio/" rel="nofollow">http://www.swigerco.com/gnuradio/</a><p>[2] Off-the-Shelf Reconfigurable Software Define Radio Approach for Vector Network Analyzer:<p><a href="https://jati.apu.edu.my/files/2018/12/2018_Issue2_Paper1.pdf" rel="nofollow">https://jati.apu.edu.my/files/2018/12/2018_Issue2_Paper1.pdf</a><p>[3] ADALM-PLUTO: Software-Defined Radio Active Learning Module (USD230):<p><a href="https://www.analog.com/en/resources/evaluation-hardware-and-software/evaluation-boards-kits/adalm-pluto.html" rel="nofollow">https://www.analog.com/en/resources/evaluation-hardware-and-...</a><p>[4] RFSoC 4x2 Development Kit Overview (USD2K):<p><a href="https://news.ycombinator.com/item?id=39427825">https://news.ycombinator.com/item?id=39427825</a>
this VNA is super great. for $600 you get up to 8Ghz (not a typo, 8GHz can be archived in harmonic mode) usable range. with two of them you can do 4port measurement. you can also produce time domain reflectometry with it. open source hardware, firmware, fpga and pc side software.
This is insane. The project includes the hardware (GHz-capable RF-generation and measurement), firmware (FPGA) and Software (a cpp GUI). Surely that can't be all from one person?
Very impressive.<p>One minor nit: the page is for some unfathomable reason not zoomable on mobile (Chrome on Android), making the schematics hard to read. Extra annoying when you click it and get the SVG source (which means it would zoom perfectly).