**🎓 Dr. Freemo 🇳🇱** @freemo@qoto.org · Dec 13, 2018, 20:46

**🎓 Dr. Freemo 🇳🇱** @freemo@qoto.org · Dec 13, 2018, 20:46

🎓 Dr. Freemo 🇳🇱 @freemo@qoto.org

I've been hankering to do some EE work lately... I think I want to do something analog, maybe RF, but what to do....

**ComPhys** @comphys@qoto.org · Dec 14, 2018, 10:49

**ComPhys** @comphys@qoto.org · Dec 14, 2018, 10:49

ComPhys @comphys@qoto.org

@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.

**🎓 Dr. Freemo 🇳🇱** @freemo@qoto.org · 2018-12-14T19:06:48Z

🎓 Dr. Freemo 🇳🇱 @freemo@qoto.org

@comphys Here is a directional coupler and VNA board I built on my bench, without the microprocessor bit attached.