asdf
https://github.com/nanovna-v2/NanoVNA-QT
https://nanovna.com/?page_id=90
https://www.crowdsupply.com/cariboulabs/cariboulite-rpi-hat
http://oh2bsc.com/2015/02/17/getting-started-with-sdr-radio-using-dvb-t-usb-dongle-and-gqrx/