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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.
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.
First analogue radio-controlled wristwatch worldwide, Junghans Mega, 1991 The JUNGHANS MEGA was "the world's first radio-controlled wristwatch with hands " [ 1 ] (analog watch) in 1991. It was produced by the German watchmaker Junghans , who had already introduced a digital watch called Mega 1 to the market in 1990.
In 1979, Sharp released the world's first quartz-based talking clock, the Talking Time CT-660E (German version CT-660G). Its silver transistor-radio-like case contained complex LSI circuitry with 3 SMD ICs (likely clock CPU, speech CPU and sound IC), producing a Speak&Spell-like synthetic voice. At the front rim was a small LCD.
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, [49] [50] 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 Skyhawk A-T line features radio-controlled timekeeping. The watches can synchronize with radio clocks in Japan, North America, and Europe, automatically selecting the correct frequency by location. The watch actually tracks two time zones—home and world—but synchronizes to the 'home' zone. When traveling, the user may swap the 'home ...