Radio-Controlled Clock - Grundig Sonoclock 760 DCF User Manual

SETTINGS
______________________________________________

Radio-controlled clock

With your built-in radio-controlled clock, you are in possession of an
absolutely precise alarm and meeting clock which is automatically set to the
radio-transmitted time signals of the most precise clock in the world: the
atomic clock of the Physikalisch-Technischen Bundesanstalt (PTB – the German
national metrology institute). This clock is so precise that in 1 million years a
deviation of 1 second can be expected.
Your radio-controlled alarm clock receives "time telegrams" via long wave
77.5 kHz from the time signal transmitter DCF 77, located in Mainflingen
(24 km south-east of Frankfurt/Main). This time signal transmitter has a range
of 1500 km.
The device receives the station DCF 77 free of charge via the connected
DCF 77 antenna everywhere, where a sufficient long wave reception is
possible with a good portable radio. In many cases, your radio clock receives
the time telegrams from a considerable distance from the station; however,
the local reception quality plays a significant role here.
The installed microprocessor of the radio-controlled clock processes the
received time telegrams and controls the quartz clock fully automatically.
After the clock is first activated, the DCF synchronisation is performed immedi-
ately and subsequently every day at 2 am and 3 am. Depending on the point
of reception, synchronisation can take several minutes. During this process,
•
the » « display flashes, if the signal is strong enough, in a 1 second
g
rhythm of the received time telegram. After synchronisation has taken place,
the display begins to light up. In addition to the advantages of the time preci-
sion and the exact, to-the-second wake-up and alarm signal, your radio clock
sets itself fully automatically from winter time to summer time.
26 ENGLISH