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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.
These signals transmit the time measured by atomic clocks accurate to one second in millions of years. By synchronizing daily with the signals, the Wave Ceptor watches achieve high accuracy, using a quartz crystal to keep time in the interim. Some radio watches, including some Wave Ceptors, are solar-powered, supported by a rechargeable battery ...
In laboratory settings atomic clocks had replaced quartz clocks as the basis for precision measurements of time and frequency, resulting in International Atomic Time. By the 1980s, quartz technology had taken over applications such as kitchen timers , alarm clocks , bank vault time locks , and time fuzes on munitions, from earlier mechanical ...
18 cesium atomic clocks and 4 hydrogen maser clocks Cs, H National Institute of Information and Communications Technology; Koganei, ... DOST-PAGASA Juan Time [27]
Citizen launched the world's first multi-band atomic timekeeping watch in 1993 and has remained a pioneer of this field. Synchronized to atomic clocks, these watches are accurate to within one second in one hundred thousand years. [7] The Skyhawk A-T line features radio-controlled timekeeping.
The DCF77 time signal is used for the dissemination of the German national legal time to the public. [5] Radio clocks and watches have been very popular in Europe since the late 1980s and, in mainland Europe, most of them use the DCF77 signal to set their time automatically.
In this type, the watch's quartz oscillator is set to the correct time daily by coded radio time signals broadcast by government-operated time stations such as JJY, MSF, RBU, DCF77, and WWVB, [50] [51] received by a radio receiver in the watch. This allows the watch to have the same long-term accuracy as the atomic clocks which control the time ...
The development of atomic clocks has led to many scientific and technological advances such as precise global and regional navigation satellite systems, and applications in the Internet, which depend critically on frequency and time standards. Atomic clocks are installed at sites of time signal radio transmitters. [113]