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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.
HF radio and antenna (plus software if automatic updating of computer time is desired) TrueTime TL-3 WWV Receiver; ntpd with Radio WWV Audio Demodulator/Decoder (driver can tune ICOM HF radios via C-IV) COAA's Radio Clock [21] F6CTE's CLOCK [15] WWVH: 5, 10, and 15 MHz AM Voice with modified IRIG-Hformat time code on 100 Hz sub-carrier (CCIR code)
The Time from NPL is a radio signal broadcast from the Anthorn Radio Station near Anthorn, Cumbria, which serves as the United Kingdom's national time reference. [1] The time signal is derived from three atomic clocks installed at the transmitter site, and is based on time standards maintained by the UK's National Physical Laboratory (NPL) in Teddington. [2]
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 ...
In Europe, the stated reception range is approximately 1,500 kilometres. Later Casio radio-controlled watches are branded as the basic Wave Ceptor and more expensive Lineage and Oceanus lines. More recent watches that connect to a smartphone with Bluetooth get Internet time from the phone, without requiring long-distance radio reception. [3]
Consumer grade radio clock movement with the DCF77 receiver (right) in the clock. The small ferrite loopstick antenna used in this alarm clock can be seen at the left. Due to the propagation process, phase and/or frequency shifts observed in received signals the practical obtainable accuracy is lower than originally realized with the atomic ...
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- 3579 S High St, Columbus, OH · Directions · (614) 409-0683
