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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.
Such clocks from that early time period include the Small World Dual Bell Ringers and the Small World Performing Musicians, [3] which all utilized simple square waves for sound synthesis. By the early 90s, new models used FM synthesis , and a few models were revamped with FM synthesis, with at least some using Yamaha ICs.
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 balance wheel movements, an upheaval known in watchmaking as the quartz crisis. Quartz timepieces have dominated the wristwatch and domestic clock market since the 1980s.
WWVB's Colorado location makes the signal weakest on the U.S. east coast, where urban density also produces considerable interference. In 2009, NIST raised the possibility of adding a second time code transmitter, on the east coast, to improve signal reception there and provide a certain amount of robustness to the overall system should weather or other causes render one transmitter site ...
Clocks have different ways of displaying the time. Analog clocks indicate time with a traditional clock face and moving hands. Digital clocks display a numeric representation of time. Two numbering systems are in use: 12-hour time notation and 24-hour notation. Most digital clocks use electronic mechanisms and LCD, LED, or VFD displays.
Ridgeway Clocks is a division of Howard Miller Company, and is a producer of longcase clocks, mantle clocks, and wall clocks. The company's facilities are located in Zeeland Michigan. According to Furniture Today magazine, Howard Miller is one of only three major manufacturers of floor clocks in the U.S. [citation needed]
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