RADIO CONTROLLED TIME:
The time base for the radio-controlled time is a Cesium Atomic Clock operated by
the Physikalisch Technische Bundesanstalt Braunschweig which has a time
deviation of less than one second in every 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.
The alarm clock receives this signal and converts it to show the precise time and so
when within this range the received time is completely accurate.
CHECKING FOR DCF-77 RECEPTION:
The alarm clock will automatically start scanning for the DCF-77 frequency signal
after the battery is inserted
. In normal surroundings (for example away from
interfering sources such as TV sets), it takes between 3-5 minutes to receive the
signal.
If after 10 minutes of inserting the battery into the alarm clock and the DCF-
77 signal is not received, then check the following list before manually setting the
time (see Manual time setting):
1. The distance of the alarm clock should be at least 1.5-2.0 meters away from
interfering sources such as computer monitors or TV sets.
2. Avoid placing the alarm clock onto or in the immediate proximity of metal, doors,
windows frames or structures.
3. Within thick concrete rooms such as basements and tower blocks, the DCF-77
signal is naturally weaker. In extreme cases, place the alarm clock closer to a
window and/or point its front or rear towards the general direction of the
Frankfurt/Main transmitter (avoid positioning within close proximity of metal
frames or structures).
Note:
Users may be located in areas where atmospheric disturbances are the direct cause
for not receiving the DCF-77 frequency signal. During nighttime, atmospheric
disturbances are usually less severe and reception is possible in most cases. With a
single daily reception, it is adequate for the alarm clock to keep time deviation to
below 0.5 seconds in a period of 24 hours.
When reception is successful, the DCF-77 tower icon will start flashing on the LCD.
Once the signal is “locked”, the DCF-77 tower icon will stay fixed on LCD and the
received time will automatically correct the manually set time. As well as the time,
the date will also be received by the alarm clock and will be displayed accordingly in
the calendar section of the LCD.
FUNCTION KEYS:
The radio-controlled alarm clock uses the following keys:
SNOOZE/
:
Alarm snooze function
24HR AL
/
:
Enter time setting mode
,
time zone and
snooze duration, s
top
alarm and snooze
:
Back-light-On
AL/HR
:
Alarm 1 time setting, alarm 1 icon
(((1)))
, alarm STOP for alarm 1
:
Set the hours and time zone
