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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.
BPC transmits a time signal on 68.5 kHz, which can be used for synchronizing radio controlled clocks. The transmission site is situated near Shangqiu , Henan Province [ 1 ] at 34°27′25″N 115°50′13″E / 34.457°N 115.837°E / 34.457; 115
Today, global navigation satellite systems radio signals are used to precisely distribute time signals over much of the world. There are many commercially available radio controlled clocks available to accurately indicate the local time, both for business and residential use. Computers often set their time from an Internet atomic clock source ...
Inter-range instrumentation group timecodes, commonly known as IRIG timecode, are standard formats for transferring timing information.Atomic frequency standards and GPS receivers designed for precision timing are often equipped with an IRIG output.
Radio-controlled watches require no setting of time and date, or daylight saving time adjustments, as they attempt automatic synchronization several times every night. [1] Without synchronisation, Wave Ceptors, like other commercial quartz timepieces, are typically accurate to ± 15 seconds per month; daily synchronization ensures 500 ms accuracy.
Standard-quality 32 768 Hz resonators of this type are warranted to have a long-term accuracy of about six parts per million (0.0006%) at 31 °C (87.8 °F): that is, a typical quartz clock or wristwatch will gain or lose 15 seconds per 30 days (within a normal temperature range of 5 to 35 °C or 41 to 95 °F) or less than a half second clock ...
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They also developed the world's first radio-controlled atomic alarm clock with an analogue alarm setting. In 1996, a new radio-controlled movement was developed: the smallest dual-motor, radio-controlled movement with the fastest setting system. This movement corrects to the right time within five minutes. [8]