An amateur in Germany, DL3IKE, found this recently:
https://www.cia.gov/library/readingroom/docs/CIA-RDP78-03424A000400090001-9.pdf
22 Jun 2018
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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.
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Clifton Suspension Bridge - NOT amateur radio
This was one of Isambard Kingdom Brunel’s greatest projects.
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1 comment:
Looks like 136Khz should do well but my own earth rod tests at this freq never produced much of note, but I don't have the luxury of 100m spacing nor a well!
73 Ken G4APB
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