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DCF Radio-controlled alarm clock CK 1703
Setting up the radio-controlled alarm
clock
− Set up the radio-controlled alarm clock as
close to a window as possible. Here, the
reception will generally be best.
About the time signal
transmitter DCF77
This radio-controlled alarm clock receives its radio
signals from the time signal transmitter DCF77.
This broadcasts the precise and official time of the
Federal Republic of Germany on the long-wave
frequency of 77.5 kHz. The transmitter is located in
Mainflingen near Frankfurt am Main and, with its
range of up to 2000 km, supplies the majority of
radio-controlled clocks in western Europe with the
necessary radio signals.
As soon as the radio-controlled alarm clock is
supplied with power, it switches to reception and
searches for the signal from the transmitter DCF77.
If the time signal is received in sufficient strength,
the time is displayed.
The radio-controlled alarm clock switches on several
times a day and synchronises the time with the radio
signal from the transmitter DCF77. In the event the
signal is not received, e.g. during a strong storm, the
clock continues to run precisely and then switches to
receiving mode again at the next scheduled time.
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