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A mid-1940s alarm clock radio with AM radio stations only A typical 1980s clock radio featuring a digital clock/alarm and an analogue FM/MW/LW receiver. A clock radio is an alarm clock and radio receiver integrated in one device. [18] The clock may turn on the radio at a designated time to wake the user, and usually includes a buzzer alarm.
A radio clock receiver may combine multiple time sources to improve its accuracy. This is what is done in satellite navigation systems such as the Global Positioning System . GPS , Galileo and GLONASS satellite navigation systems have one or more caesium, rubidium or hydrogen maser atomic clocks on each satellite, referenced to a clock or ...
WWVB is a time signal radio station near Fort Collins, Colorado and is operated by the National Institute of Standards and Technology (NIST). [ 1] Most radio-controlled clocks in North America [ 2] use WWVB's transmissions to set the correct time. The normal signal transmitted from WWVB is 70 kW ERP and uses a 60 kHz carrier wave yielding a ...
A bedside clock radio that combines a radio receiver with an alarm clock. Radios are manufactured in a range of styles and functions: Console radio - A self-contained radio with speaker designed to stand on the floor. Table radio also called a "Mantel radio" - A self-contained radio with speaker designed to sit on a table, cabinet, or fireplace ...
Began operation. 1 January 1959; continuous date and time information was added in June 1973. Official range. 2,000 km (1,243 mi) Website. DCF 77. Low cost DCF77 receiver. DCF77 is a German longwave time signal and standard- frequency radio station. It started service as a standard-frequency station on 1 January 1959.
Radio Data System ( RDS) is a communications protocol standard for embedding small amounts of digital information in conventional FM radio broadcasts. RDS standardizes several types of information transmitted, including time, station identification and program information. The standard began as a project of the European Broadcasting Union (EBU ...
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