This image is at http://www.solen.info/solar/images/cycles23_24.png.
See https://arxiv.org/abs/1808.04868
See https://arxiv.org/abs/1808.04868
Simple QRP projects, 10m, 8m, 6m, 4m, FT8, 160m, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff, some not related to amateur radio.
For about 30 minutes, as usual, I went on the 2m activity contest. I worked 4 stations with my 10W, poor voice and big-wheel omni antenna. ...