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The other standard time and frequency reference for the U.S. Government is the National Institute of Standards and Technology (NIST) master clock. The U.S. Naval Observatory also maintains an alternate clock designated "USNO Alternate Master Clock" at Schriever Space Force Base, Colorado. [2]
NIST Automated Computer Time Service (ACTS) [27] +1-303-494-4774 +1-808-335-4721; Windows computer with dialup modem. ntpd with NIST/USNO/PTB Modem Time Services driver; ClockWatch Pro for Windows [22] USNO Master Clock modem time [28] +1-202-762-1594 Computer with Bell 212A or CCITT V.22 compatible modem US Naval Observatory time service UTC(USNO)
NIST‑F1 serves as the source of the nation's official time. From its measurement of the natural resonance frequency of cesium—which defines the second—NIST broadcasts time signals via longwave radio station WWVB near Fort Collins, Colorado, and shortwave radio stations WWV and WWVH, located near Fort Collins and Kekaha, Hawaii ...
The time-scale computations on 7 June 2007 weighted 70 of the clocks into the standard. [33] US Naval Observatory outside display of the master clock time. The U.S. Naval Observatory provides public time service via 26 NTP [33] servers on the public Internet, [36] and via telephone voice announcements: [37] +1 202 762-1401 (Washington, DC)
Official and highly precise timekeeping services (clocks) are provided by two federal agencies: the National Institute of Standards and Technology (NIST) (an agency of the Department of Commerce); and the United States Naval Observatory (USNO). The clocks run by these services are kept synchronized with each other as well as with those of other ...
NIST-F1, source of the official time of the United States. NIST-F1 is a cesium fountain clock, a type of atomic clock, in the National Institute of Standards and Technology (NIST) in Boulder, Colorado, and serves as the United States' primary time and frequency standard. The clock took fewer than four years to test and build, and was developed ...
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Between 31 and 39 seconds past the minute inclusive, the once-per-second tones are reduced to 10-millisecond "ticks" while a digital time code is transmitted. The digital time code is formatted so that a Bell 103-compatible 300-baud modem can decode it, [5] and CHU is the only time signal station that uses this format for its time code ...