I have mentioned before how the light reflected off the water made patterns on the ceiling of the classroom. It was a long time before I realised what it was!
There are several videos on YouTube including these here.
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.
MLS, one of the large UK distributors, is selling the DX Patrol Ground Staion for QO-100. I guess you have to add a GPS external reference, ...
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