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World wide receiver radio4/9/2023 ![]() Two capacitance hats, height 122 metres (400') In general, each station has its own format for the time code. The stations vary in broadcast frequency, in geographic location, and in how the signal is modulated to identify the current time. Radio clocks depend on coded time signals from radio stations. Some timekeepers, particularly watches such as some Casio Wave Ceptors which are more likely than desk clocks to be used when travelling, can synchronise to any one of several different time signals transmitted in different regions. Radio clocks synchronized to a terrestrial time signal can usually achieve an accuracy within a hundredth of a second relative to the time standard, generally limited by uncertainties and variability in radio propagation. 1.1.1 List of radio time signal stations.1.1 Longwave and shortwave transmissions.Other broadcast services may include timekeeping information of varying accuracy within their signals. ![]() Dedicated GPS timing receivers are accurate to better than 1 microsecond however, general-purpose or consumer grade GPS may have an offset of up to one second between the internally calculated time, which is much more accurate than 1 second, and the time displayed on the screen. GPS satellite receivers also internally generate accurate time information from the satellite signals. Systems using dedicated time signal stations can achieve accuracy of a few tens of milliseconds. Other radio controlled clocks use the time signals transmitted by dedicated transmitters in the shortwave bands. The radio controlled clock will contain an accurate time base oscillator to maintain timekeeping if the radio signal is momentarily unavailable. One common style of radio-controlled clock uses time signals transmitted by dedicated terrestrial longwave radio transmitters, which emit a time code that can be demodulated and displayed by the radio controlled clock. RC clocks may include any feature available for a clock, such as alarm function, display of ambient temperature and humidity, broadcast radio reception, etc. ![]() Such systems may be used to automatically set clocks or for any purpose where accurate time is needed. Such a clock may be synchronized to the time sent by a single transmitter, such as many national or regional time transmitters, or may use the multiple transmitters used by satellite navigation systems such as Global Positioning System. A radio clock or radio-controlled clock (RCC), and often (incorrectly) 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.
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