What Is Dcf - Conrad 67 20 72 Bedienungsanleitung

5. What is DCF?

The product is able to to receive and evaluate the so-
called DCF signal.
The DCF signal is a coded radio signal that contains
the time information of the caesium atomic clock of
the Physikalisch-Technischen Anstalt (Federal Physical
Technical Agency) in Braunschweig.
This atomic clock is so accurate that in theory, a devia-
tion from the actual time of +/- 1 second is possible only
in a million years. This signal is sent by a transmitter in
Mainfl ingen (near Frankfurt on the Main).
It has a range of up to 1500 km and if transmission conditions are ideal, as high as up to 2000
km. Watches equipped with a DCF receiver (radio clocks) can receive and decode the DCF
signal within this transmitting range. Similar to radio reception, the receiving of a DCF signal is
highly dependent on location, position and interference signals, e.g. from computers, television
sets or microwave ovens. Another reasons for poor reception can be reinforced concrete walls
that weaken the DCF signal.
The DCF signal includes the exact time (theoretical deviation of 1 second in a million years!)
and the date.
This means you do not have to switch manually between daylight savings time and normal time.
The fi rst DCF reception trial is always performed when using for the fi rst time.
It can take 3-5 minutes for the DCF signal to be received and evalu-
ated. Do not move the product during this time. Do not press any buttons.
Do not place the radio projection clock next to electric/electronic devices; do not
place it near cables, plugs or metallic components. Poor reception can also be
expected near metal-evaporated insulated glass windows, reinforced concrete,
coated special-purpose wall covering or in basements.
If the fi rst reception trial fails, repeat the trial every three hours. One single, faultless reception
per day is suffi cient to keep the daily precision deviation under 1 second. At the fi rst successful
reception trial, the signal for the time is updated daily at mid-night.
If after 10-20 minutes no current time/date appears in the display, install the product at a differ-
ent location. Start another reception trial (press the"SET/WAVE" (3) button until a radio tower
symbol appears in the display or remove the battery briefl y).
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