![]() For example, if the clock is installed in a mobile home or a house with metal siding, radio control might not be possible. Note that the shielding of a metal building may prevent radio controlled clocks from receiving WWVB's atomic clock synch signal. They can cause interference, and some have a scan frequency at or near the WWVB carrier frequency of 60 kHz. Locate atomic wall clocks at least 4-8 feet away from computer monitors.Place the radio controlled clock along a wall or near a window that faces towards Fort Collins.Atomic clocks have antennas that are directional and reception may be improved by turning the antenna to increase signal strength. If it's a wall clock, try mounting it on a wall perpendicular to the one it is currently on (if it is on a north or south wall try an east or west wall). If the radio controlled clock is a desk top unit, try rotating it 90 degrees.If the clock uses batteries, check them and replace if necessary. Try powering down the clock (unplug it or remove the batteries), then turn it on again to see if it synchronizes.If you are having problems, check first to see if the atomic clock synchronization signal is being received. An analog radio controlled clock may provide an audio indication (typically a series of tones or beeps to indicate if the signal is there, accessed by pushing a button). Most atomic digital clocks have an icon in the display that indicates if the atomic clock signal is being received properly from WWVB (usually a radio tower icon). ![]() 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.How does an atomic clock work? A radio controlled clock sold in North America is permanently set to receive and process an atomic clock synchronization signal broadcast from WWVB in Boulder, Colorado. 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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