From my Twitter feed: WSPR antenna testing, 3D Smith Chart, SW activity monitorJuly 10, 2017 By Dan KB6NU 1 Comment@OH8STNWSPR Antenna Testing Methodology oh8stn.org/blog/2017/06/2…@MicrowavesRFThe Smith Chart Enters a New Dimension bit.ly/2uRUqng@hackaday Radio project on #Hackadayio detects activity on shortwave channels using #RaspberryPi. bit.ly/22zgob5