TFA DCF-77 Bedienungsanleitung Seite 6

TFA_No. 60.2500 Anleitung
Radio controlled alarm clock with thermometer
1. Features
• Highest precision radio-controlled clock
• With time zone and manual setting option
• Alarm with two alarm times
• Snooze function
• Indication of day and date
• Indoor temperature
• Backlight
2. Elements
LCD (Fig. 1)
A: Clock
B: Alarm 1, Alarm 2
C: Date with weekday
D: Indoor temperature
E: DCF signal
F: Alarm symbol
Buttons (Fig. 2)
G: "SNOOZE/LIGHT" button
H: "TIME/SET" button
I: "+" button
J: "-" button
K: "AL 1" button
L: "AL 2" button
Housing (Fig. 3)
M: Battery compartment
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29.07.2011 9:49 Uhr Seite 6
Radio controlled alarm clock with thermometer
3. Getting started
• Insert the batteries 2x 1.5 V AA, observing the correct polarity.
• When the alarm clock is powered up, a short beep will sound
and all LCD segments will light up for about 2 seconds.
• The clock will scan the DCF frequency signal and the DCF
symbol flashes on the LCD. When the signal is received suc-
cessfully after 3-5 minutes, the radio controlled time and
the DCF symbol appears permanently.
• In case the clock cannot detect the DCF-signal (for example
due to disturbances, transmitting distance, etc.), the time
can be set manually. The clock will then work as a normal
quartz clock (see 4.1 Setting of clock and calendar).
Radio controlled time reception
The time base for the radio controlled time is a Caesium Atomic
Clock operated by the Physikalisch Technische Bundesanstalt
Braunschweig which has a time deviation of less than one
second in one million years.The time is coded and transmitted
from Mainflingen near Frankfurt via frequency signal DCF-77
(77.5 kHz) and has a transmitting range of approximately 1,500
km. Your radio-controlled clock receives this signal and con-
verts it to show the precise time in summer or wintertime. "S"
appears during summer time. The quality of the reception
depends greatly on the geographic location. In normal cases,
there should be no reception problems within a 1,500 km
radius around Frankfurt.
Please take note of the following:
• Recommended distance to any interfering sources like com-
puter monitors or TV sets is a minimum of 1.5 - 2 metres.
• Within ferro-concrete rooms (basements, superstructures),
the received signal is naturally weakened. In extreme cases,
please place the unit close to a window and/or point its
front or back towards the Frankfurt transmitter.
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