The signal is also used in homes and offices around the country. These include 999 communications, rail networks, cash machines and mobile phone networks.
#Radio clock signal professional
The time signal is accurate to within one thousandth of a second and supports a range of professional services. The signal, often referred to as ‘The time from Rugby’, will be known as ‘The Time from NPL’ from April 2007.
The time signal used to set Britain’s radio controlled clocks with extreme accuracy is on the move from Rugby, where it has been transmitted since 1927, to a new home in Anthorn in Cumbria. The UK’s time signal is on the move after 80 years in Rugby. Will the switch from Rugby to Anthorn, Cumbria affect me? Domestic clocks/watches are generally refered to as either 'Radio Controlled' in the UK or 'Atomic' in America, they are both the same. The Caesium 133 Clock itself is housed under controlled conditions in a laboratory and a radio signal is transmitted which uses this clock as a referance. The term "Atomic" when applied to domestic clocks and watches purely refers to the source of the time signal. The transmitter signal is picked up by the watch or clock and sets the time and date automatically.ĭoes my watch contain any radioactive material?
The atomic clock is the standard measure of time: the electron resonance frequency of the Caesium 133 atom is 9,192,631,770 cycles per second which is measured to give a time accurate to greater than +/- 1 second per million years. In October 2001, transmission from the Kyushu station commenced allowing the standard frequency to be received across the entire country.Ĭurrently, a study for providing a variety of information including news and emergency information, as well as time information, using the standard frequency, is underway.Radio controlled watches and clocks receive a time signal from a radio transmitter tuned to a caesium or 'Atomic Clock'. Since commencing transmission of the standard frequency from Fukushima station in June 1999, transmission power has been strengthened from 10kW to 50kW, and the reception range has expanded to approximately 1,200 km from the station. The standard frequency in Japan is operated by the National Institute of Information and Communications Technology (NICT) ( ), and transmitted from the Fukushima standard frequency station (Ohtakadoyayama) and Kyushu standard frequency station (Haganeyama). The microprocessor decodes the time signal, and adjusts the timepiece and displays the precise time automatically.Īfter having received a time signal, the timepiece runs as accurate as an ordinary quartz timepiece. The signal is amplified in the receiver and the receiving pulse is sent to the microprocessor. The JST is based on a "Cesium atomic clock" that may gain or lose 1 second over the course of 100,000 years.Ī time signal on the standard frequency sent by a transmitting station is received by the antenna and sent to the receiver of the timepiece. The antenna inside the case or band of the timepiece automatically receives the time signal of the Japan Standard Time (JST) transmitted on the official standard frequency which includes time and calendar information at regular time intervals to adjust losses or gains and display the precise time. The mechanism of the radio-controlled timepiece for displaying precise time is as follows. One is a radio-controlled watch (operates in any position and is designed to be carried or worn) and another is a radio-controlled clock (designed to be used in a fixed position). There are two types of radio-controlled timepieces. The radio-controlled timepiece displays the precise time and calendar by automatically receiving a radio signal on an official standard frequency.
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