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reddit455 t1_iu63bby wrote

Reply to comment by SublimeMudTime in TIL that in 1968 the US Navy proposed turning 2/5ths of Wisconsin into a giant underground radio antenna so orders could still be sent to submarines following a nuclear attack on America by DeadForDecember

there's STILL one in Colorado (and a few other places around the world).. it literally takes a minute or so just to transmit time. few bytes

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https://www.nist.gov/pml/time-and-frequency-division/time-distribution/radio-station-wwvb/help-wwvb-radio-controlled

In the United States, the signals received by radio controlled clocks originate from NIST Radio Station WWVB, which is located near Fort Collins, Colorado. WWVB broadcasts on a frequency of 60 kHz. Your radio controlled clock actually has a miniature radio receiver inside, which is permanently tuned to receive the 60 kHz signal.

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Wurm42 t1_iu6p7wf wrote

Yeah, the bitrate is terrible, which is why Sanguine and other early military ELF transmitters only sent three-letter code groups.

The messages you could send were basically "Sub X, execute plan Q out of your standing orders, or "Sub X, find a safe spot to surface and check in by radio or satellite coms".

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SFXBTPD t1_iu8tgd3 wrote

Sub Z in the foyer with the ballistic missle

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