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How a radio-controlled
alarm clock works
The exact time is received from the official
German transmitter DCF77. The transmitter is
located in Mainflingen, near Frankfurt on Main.
The signal is transmitted on long wave at
77.5 kHz in a radius of approx. 1,500 km
(900 miles).
The alarm clock receives and sets the time
automatically using its built-in antenna. Once
the time is set, the alarm clock continues
operating on its quartz movement. The clock's
receiver system switches on daily and com-
pares the received time to the time displayed.
The alarm clock is highly accurate, meaning
that it will display the correct time even if the
clock is occasionally unable to receive the time
signal.
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