WWV Fort Collins, Colorado and WWVH Kekaha, Hawaii Atomic Clock Stations

Refer:   https://wwv.mcodes.org/
WWV is a radio station run by the National Institute of Standards and Technology (NIST) that broadcasts precise time and frequency from Fort Collins, CO. A companion station, WWVH, provides a similar service from Kekaha, HI. The time sources are highly accurate atomic clocks. These broadcasts contain an audible portion (which this site emulates), and a digital time code that can be received by clocks and watches for automatically maintaining precise time.