I 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-divis

I 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...