Simple QRP projects, 10m, 6m, FT8, JT65, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff.
500 kHz was replaced in 1999 by the Global Maritime Distress and Safety System (GMDSS), which uses a combination of automated terrestrial and satellite communications.
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Well I am pretty sure I've posted this link before, not that it matters. When I started in the 1960s my first experiences were with sh...