– 20 – – 21 – 2120
LUMIO PLUS – Radio-controlled alarm clock
• 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.
• 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 manu-
ally. 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, converts it and always shows the exact time.
The adjustment to Daylight Saving Time (summer/winter time) is automatic. In Daylight Saving Time DST is shown on the dis-
play. The reception quality depends mainly on geographic location. Normally there should be no reception problems within a
1,500 km radius around Frankfurt.
LUMIO PLUS – 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.
• The manually set time is overwritten once the DCF time signal is successfully received.
7.1.1 Display change °C/°F
• Press the MIN/DATE/°C/°F button to select the temperature display in °C (Celsius) or °F (Fahrenheit) as temperature unit.
7.1.2 12-HR or 24-HR system
• Press the 12/24/YEAR button to choose between the 12-hour or 24-hour system. In 12-hour system AM or PM appears
on the display.
TFA_No. 60.2553_Anleitung_10_19 18.10.2019 16:03 Uhr Seite 11
