2322
Radio-controlled alarm clock
Radio-controlled alarm clock
6.2 Note on radio-controlled time
The time base for the radio-controlled time is a caesium atomic clock
operated by the Physikalisch Technische Bundesanstalt based in Braun-
schweig (Brunswick), Germany. It has a time deviation of less than one
second in one million years. The time is coded and transmitted from
Mainflingen near Frankfurt via the frequency signal DCF-77 (77.5 kHz)
and has a transmitting range of approximately 1,500 km. The adjust-
ment to Daylight Saving Time (summer/winter time) is automatic. In
Daylight Saving Time DST is shown on the display. The reception quali-
ty depends mainly on geographic location. Normally there should be no
reception problems within a 1,500 km radius around Frankfurt.
Therefore, please note the following steps:
• The recommended distance to any interfering sources like computer
screens or TV sets is at least 1.5 - 2 meters.
• Within concrete walls (reinforced with steel) such as basements, the
received signal is naturally weakened. In extreme cases, please place
the unit close to a window to improve reception.
• During night-time, the atmospheric interference is usually less
severe and reception is possible in most cases. A single daily recep-
tion is adequate to keep the accuracy deviation under 1 second.
7. Operation
• Press and hold the – or + button in the respective setting mode for
quick settings.
• The clock will now scan the DCF frequency signal and the DCF sym-
bol will be flashing on the display. When the time code is successful-
ly received after 3-5 minutes, the radio-controlled time and the DCF
symbol will be shown steadily on the display.
• In Daylight Saving Time, DST is shown on the display.
• If reception is not possible, you can start the initialization manually.
• Press and hold – button for three seconds.
• The DCF reception symbol will be flashing. If the reception is not
successfully received, another DCF reception will take place the next
full hour.
• Interrupt the reception by pressing and holding the – button again
for three seconds . The DCF reception symbol disappears.
• The DCF reception always takes place daily at 3:00 o'clock in the
morning. If the reception is not successfully received at 3:00 o'clock,
the next DCF reception attempt will happen at 4:00 and 5:00 o'clock.
• A button operation is not possible during the DCF reception.
• There are three different reception symbols:
flashing - reception is active
solid - reception is very good
no symbol - No DCF reception
• If the clock cannot detect the DCF-signal (e.g. due to interference,
transmitting distance, etc.), the time can be set manually. The clock
will then work as a normal quartz clock. (see: Manual setting of the
clock and calendar).
TFA_No. 60.2536_Anleit_03_21 06.03.2021 18:29 Uhr Seite 12
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