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Digital text pages embedded in television video also provide accurate time.Many modern TV sets and VCRs with TTX decoders can obtain accurate time from Teletext and set the internal clock. The DVB and ATSC standards have 2 packet types that send time and date information to the receiver.Such systems may be used to automatically set clocks or for any purpose where accurate time is needed.RC clocks may include any feature available for a clock, such as alarm function, display of ambient temperature and humidity, broadcast radio reception, etc.Other broadcast services may include timekeeping information of varying accuracy within their signals.generally limited by uncertainties and variability in radio propagation.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.
Systems using dedicated time signal stations can achieve accuracy of a few tens of milliseconds.
The stations vary in broadcast frequency, in geographic location, and in how the signal is modulated to identify the current time.
In general, each station has its own format for the time code. The signal is transmitted in non-overlapping time: - UTC RAB99 - UTC RJH86 - UTC RAB99 - UTC RJH69 - UTC RJH90 - UTC RJH77- UTC RJH86- UTC RJH63 A current list of times signal stations is published by the BIPM as an appendix to their annual report; the appendix includes coordinates of transmitter sites, operating schedules for stations, and the uncertainty of the carrier frequency of transmitters.
A radio clock or radio-controlled clock (RCC) is a 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.
(Alarm clocks with broadcast radio receivers, a totally different concept, are often called "clock radios".) 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 GPS.