When I retired in 2008, I was given a 1920s crystal set as a leaving present.
It was in good condition and was a total surprise.
See https://sites.google.com/site/g3xbmqrp3/hf/gecophone
14 Apr 2020
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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.
These were very popular QRP CW transceivers some years ago. I owned a built one and had lots of fun with it. As I recall, I mostly used it o...
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