Hackaday: The Cold War-Era Survivable Low-Frequency Communication System (SLFCS)

Many thanks to SWLing Post contributor Dennis Dura, who shares the following article about Cold War-era low-frequency communications, from Hackaday: During the Cold War, the U.S. developed the Survivable Low-Frequency Communication System (SLFCS) - a radio network designed to function even after a nuclear attack. Using long-wavelength LF and VLF signals that can travel vast [...]