amateur radio activities
I never realised there was a 40MHz amateur band. Very interesting.
from vkspotter.com :
WM2XCC in DM1340.680000 WSPR -23
Doing a Google on 40.680 Mhz WSPR, I find G3XBM talking about 40.680MHz- 8metre band.
Roger G3XBM's (Mainly) Amateur Radio Blog: 8m QRP FT8 (first) on 40.680 MHz TX and RX (g3xbm-qrp.blogspot.com)