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The NRC offers time synchronization over the Internet using Network Time Protocol. Computers, routers, and other devices with NTP clients (including Windows 2000 and later versions of Windows) can use these servers to ensure that they have the correct time. [6] The NTP stratum-2 servers are at these addresses: time.nrc.ca; time.chu.nrc.ca
A divider chain was put into service so that all of the CHU signals were derived from Western Electric standard crystal oscillators with pulses for seconds monitored by continuous comparison with the observatory clocks. By 1978 all parts of the CHU transmitted signal were derived from an NRC-designed cesium beam frequency standard. [2]
After 1956, atomic clocks were studied by many groups, such as the National Institute of Standards and Technology (formerly the National Bureau of Standards) in the USA, the Physikalisch-Technische Bundesanstalt (PTB) in Germany, the National Research Council (NRC) in Canada, the National Physical Laboratory in the United Kingdom, International ...
A modern LF radio-controlled clock. A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [1]) referred to as an "atomic clock", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.
For a trap-based nuclear clock either a single 229 Th 3+ ion is trapped in a Paul trap, known as the single-ion nuclear clock, [1] [2] or a chain of multiple ions is trapped, considered as the multiple-ion nuclear clock. [7] Such clocks are expected to achieve the highest time accuracy, as the ions are to a large extent isolated from their ...
WWV Transmitter Building (2002 or earlier) WWV's 15 MHz antenna WWV is a shortwave ("high frequency" or HF) radio station, located near Fort Collins, Colorado.It has broadcast a continuous time signal since 1945, and implements United States government frequency standards, with transmitters operating on 2.5, 5, 10, 15, 20, and 25 MHz. [1]
A speaking clock or talking clock is a live or recorded human voice service, usually accessed by telephone, that gives the correct time. The first telephone speaking clock service was introduced in France, in association with the Paris Observatory, on 14 February 1933. [1] The format of the service is similar to that of radio time signal services.
Cesium Beam atomic clock – developed by National Research Council personnel in the 1960s; Computerized braille – invented by Roland Galarneau in 1972 [24] [7] Creed teleprinter system – invented by Frederick G. Creed in 1900; Fathometer – an early form of sonar invented by Reginald Fessenden in 1919 [7]