4 ms·
The US regularly does this as well. Coded messages in the form of seemingly random letters and numbers are broadcast over HF and VLF in the clear all over the w
by mijowi 5y ago
The US regularly does this as well. Coded messages in the form of seemingly random letters and numbers are broadcast over HF and VLF in the clear all over the world. One use is for Emergency Action Messages (nuke orders). [1]
NIST also makes broadcasts for things like timekeeping. You can listen to 5k or 10k Hz and it’ll tell you what time it is. Handy for checking that your gear works.
1. https://en.m.wikipedia.org/wiki/Emergency_Action_Message https://en.m.wikipedia.org/wiki/Emergency_Action_Message
- sciurus 5y agoI think you meant megahertz, not kilohertz. The human-readable broadcasts are at 2.5, 5, 10, 15, and 20 MHz. https://www.nist.gov/pml/time-and-frequency-division/time-distribution/radio-station-wwv https://www.nist.gov/pml/time-and-frequency-division/time-di...
- mijowi 5y agoYes, MHz, my mistake