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Design Radio-controlled alarm clock
Design Radio-controlled alarm clock
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 reception is adequate to keep the accuracy deviation under 1 second.
7. Operation
7.1 Manual settings
• Important: The device cannot be operated during the DCF time-signal reception.
• Press and hold the UP or DOWN button in setting mode for fast mode.
• The device will automatically quit the setting mode if no button is pressed for 20 seconds.
7.2 Time setting
• Press and hold the MODE button in normal mode for 2 seconds.
• 00 (default) will be flashing. Press the UP or DOWN to adjust the time zone (00, 01, -01).
• The time zone correction is needed for countries where the DCF signal can be received but the time zone is dif-
ferent from the DCF time (e.g. +1=one hour plus).
• The DCF reception always takes place at 2:00 and 3:00 o'clock in the morning. If the reception is not successfully
received at 3:00 o'clock, further attempts will be taken until 5:00 o'clock.
• To avoid interference, the weak backlight turns on automatically during the reception of the radio controlled clock.
• There are 3 different reception states:
Symbol flashing - reception is active
Symbol solid - reception is very good
no symbol - no reception/time was set manual
• If the clock cannot detect the DCF-signal (e.g. due to interference, transmitting distance, etc.), the time can be
set manually. The DCF reception symbol disappears and the clock will then work as a normal quartz clock (see:
Manual settings).
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 Braunschweig (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. Your radio clock receives the signal, con-
verts it and always shows the exact time. The adjustment to Daylight Saving Time (summer/winter time) is auto-
matic. The reception quality depends mainly on geographic location. In Daylight Saving Time DST is shown on the
display. Normally there should be no reception problems within a 1,500 km radius around Frankfurt.
TFA_No. 60.2543_Anleit_05_23 27.05.2023 15:16 Uhr Seite 13
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