DCF77 is a German longwave time signal and standard-frequency radio station. https://en.m.wikipedia.org/wiki/DCF77 There are commercial receivers and readers for DCF77, but this DIY project by Erik Deruiter from the Netherlands using the Arduino MEGA from 2016 was unique. https://youtu.be/ZadSU_DT-Ks Github (V2.0), https://github.com/deruiter Flickr photo gallery https://www.flickr.com/photos/edr1924/albums/72157666568222444/ greg Sent from iPad Air