Jumbo Radio Calendar Wall Clock
Version 04/09
Item-No. 67 17 21
°
This product complies with all current National and European requirements.
Intended use
The jumbo radio calendar wall clock is intended to decode the DCF radio signal from the cae-
sium atomic clock in Braunschweig and to display the time of day, a calendar overview and the
ambient temperature and offers an alarm and reminder function.
The device may only be used indoors. Contact with moisture, for example in bathrooms, must
be avoided.
The jumbo radio calendar wall clock is designed exclusively for battery operation. Do not use any
other power supply. The suitable battery type is listed in the “Technical Data” section.
Any use other than described above is not permitted and can damage the product. In addition,
it can lead to dangers such as short-circuit, fire and electrical shock.
The safety instructions should be observed without fail!
Safety Instructions
The warranty will be void in the event of damage caused by failure to
observe these safety instructions. We do not assume liability for any result-
ing damage.
We do not assume any liability for material and personal damage caused by
improper use or non-compliance with the safety instructions. The warranty
will be void in such cases.
An exclamation mark in a triangle indicates important information in these
operating instructions, which must be followed.
☞
The “hand” symbol indicates special information and advice on operating the
device.
• For safety and approval (CE) reasons, unauthorised conversion and/or modifications to the
product are not permitted.
• Do not expose the product to high temperatures, strong vibrations or heavy mechanical loads.
• If you have any doubts about the correct operation, or the safety of the product, please con-
sult a specialist.
• Keep the product and the batteries out of the reach of children. They are not toys.
• Do not leave packing materials unattended. The may become a dangerous playthings for chil-
dren.
• Please observe the additional safety instructions in the individual chapters of this manual.
Controls and Parts
A1 Time display
B1 HOME Key
C1 Suspension eye
A2 DCF symbol
B2 key
G
C2 Support
A3 Year display
B3 Key
D
C3 Battery compartment
A4 Date display
B4 MODE/SET key
A5 Temperature display
B5 AL ON/OFF button
A6 Calendar view
B6 Key +12/24
A7 Day indication
B7 KEY °C/°F
O P E R A T I N G I N S T R U C T I O N S
www.conrad.com
Introduction to DCF
The jumbo radio calendar wall clock features a DCF controlled clock mechanism, which auto-
matically synchronises the time display with the DCF signal. Thus, it is not necessary to set the
clock by hand.
The time is adjusted by synchronising with the DCF signal from the caesium atomic clock at the
“Physikalisch Technischen Bundesanstalt” in Braunschweig (Germany). This makes it very
accurate. In the event of a loss of the signal, the clock continues to work accurately as quartz
clock.
What is DCF?
The DCF-signal is an encoded radio signal, which carries the time information from the caesium
atomic clock at PTB Braunschweig.
The atomic clock is so accurate that a theoretic deviation of +/- 1 second is only to be expected
after 1 million years.
The DCF signal is encoded and transmitted via a DCF transmitter in Mainflingen near Frankfurt.
The transmitter has a range of approximately 1,500 km.
Clocks that are equipped with a DCF receiver can receive and decode the DCF-signal within this
transmission range.
Setting the time manually is not necessary with DCF clocks (e.g. changing the time from winter
to summer time).
Similar to receiving radio signals, the DCF signal reception is very dependent on location and
position, as well as interference e.g. from computers, TV sets or microwave ovens.
Ferro-concrete walls, which dampen the DCF signal, can be a further cause of poor reception.
Inserting/Replacing the Batteries
Keep batteries out of the reach of children.
Make sure that the polarity is correct when inserting the batteries.
Remove the battery, if you are not going to use the device for a while, to pre-
vent damage from leaking. Leaking or damaged batteries/rechargeable bat-
teries can cause acid burns upon contact with skin. Thus, you should wear
protective gloves when handling damaged batteries/rechargeable batteries.
Keep them out of the reach of children. Do not leave batteries lying around.
There is the risk that the batteries may be swallowed by children or pets.
Make sure that batteries are not short-circuited or thrown into a fire. Do not
attempt to recharge the batteries. There is danger of explosion.
• Open the cover of the battery compartment (C3) on the back of the device.
• Insert three new 1.5V cells (C) in the battery compartment (C3), paying attention to the polar-
ity markings. The correct polarity is indicated in the battery compartment.
• Close the battery compartment (C3) again.
• The clock now starts searching for the DCF signal and tries to tune in.
• If the display contrast fades, the batteries are low and have to be replaced as described above.
• To ensure a long battery life, only use alkaline types.
☞
The use of rechargeable batteries leads to a shorter operating time, because of the
lower voltage and capacity.
Installation/Setup
The jumbo radio calendar wall clock can be placed on furniture or attached to the wall.
• To stand the clock, fold out the support (C2) on the back of the device.
• There are 3 suspension eyes (C1) on the rear side of the device to fasten the clock to a wall.
• Fasten the clock in place with screws that protrude a few millimetres from the wall. Hang the
clock up on the screw heads.
DCF Time Adjustment
• After inserting the batteries the clock searches automatically for the DCF signal. This is indi-
cated by the flashing DCF symbol (A2).
• Normally, the synchronisation process is completed within a few minutes.
• Once the DCF signal has been decoded, the DCF symbol (A2) appears becomes steady and
the current time and date are shown in the display.
• >To stop the attempted automatic reception, press the key with the DCF symbol (B7) until the
DCF symbol (A2) goes out.
• In normal mode, the clock starts a reception attempt each day at 03.00 am. Should the clock
not receive any signal, it tries to receive the DCF signal again at hourly intervals. When the
reception fails, the DCF symbol (A2) in the display goes out.
• To start a manual reception attempt, press the key with the DCF symbol (B7) until the DCF
symbol (A2) blinks.
• The notification DST in the display indicates summer time display.
☞
If there is interference with the reception of the DCF signal, try to find a new loca-
tion and/or leave the clock near a window overnight.
At night the reception is better, so the watch is normally synchronized the next
morning.
