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SublimeMudTime t1_iu60j26 wrote

I thought a long time ago I read that there was an ELF (extremely low frequency) transmitter in Black Duck, MN.

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reddit455 t1_iu63bby wrote

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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BigBobby2016 t1_iu62xko wrote

Wow…I was telling a young person at work about this only yesterday. It’d probably been 20 years since I’d last talked about it, now here it is on Reddit today

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_a_dude t1_iu67qom wrote

Not exactly the same thing. But this is pretty close to the Baader–Meinhof phenomenon, or frequency illusion

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emby5 t1_iu634f6 wrote

There were a few. Upper Peninsula had one (Republic, MI).

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Dont_Wanna_Not_Gonna t1_iu6jorx wrote

Is that why I can hear Radio K through my fillings when I’m passing through on my way to Lake of the Woods? I always wondered about that.

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bobnla14 t1_iu8cjrf wrote

Are you sure that isn't the result of you meds wearing off?

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PappyVanPinkhole t1_iua5aef wrote

There’s a Nelson DeMille (fiction) book, wildfire I believe, that references this a lot - great read

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