I've been hankering to do some EE work lately... I think I want to do something analog, maybe RF, but what to do....
@freemo get yourself a red pitaya and a directional coupler off eBay and you'll have everything to make a one-port VNA for €300.
@comphys Here is a directional coupler and VNA board I built on my bench, without the microprocessor bit attached.
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