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Former USNO director Gernot M. R. Winkler initiated the "Master clock" service that the USNO still operates, [29] [30] and which provides precise time to the GPS satellite constellation run by the United States Space Force. The alternate Master Clock time service continues to operate at Schriever Space Force Base in Colorado.
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]
COAA's Radio Clock [21] F6CTE's CLOCK [15] WWVH: 5, 10, and 15 MHz AM Voice with modified IRIG-Hformat time code on 100 Hz sub-carrier (CCIR code) HF radio and antenna (plus software if automatic updating of computer time is desired) TrueTime TL-3 WWV Receiver; CHU: 3.33 MHz, 7.85 MHz, 14.67 MHz Bell 103 modem tones, decodable by most computer ...
Master clock (at left) driving several slave clocks in an enthusiast's garage. The third one from the left at the top is a radio-controlled clock for reference. The master atomic clock ensemble at the U.S. Naval Observatory in Washington, D.C., which provides the time standard for the U.S. Department of Defense. [1]
USNO Alternate Master Clock ... Five caesium clocks, one passive hydrogen maser, two active hydrogen masers. [26] Cs, H National Physical Laboratory of India;
The U.S. Naval Observatory Alternate Master Clock at Schriever AFB (Colorado) is a stratum 0 source for NTP Yellow arrows indicate a direct connection; red arrows indicate a network connection. NTP uses a hierarchical, semi-layered system of time sources.
Gernot Maria Rudolph Winkler (October 17, 1922 – April 30, 2016) was responsible for the Time Service Department of the United States Naval Observatory (USNO) from 1966 to 1996. [1] Winkler oversaw the introduction of caesium beam-based Coordinated Universal Time based on hyperfine transitions and an internationally transportable "flying clock".
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