By the First World War it was already old technology.
22 Sept 2022
Marconi pre-WW1 radio station
Michael Rainey AA1TJ's Facebook page has this photo of a very early Marconi radio station on Cape Cod.
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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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