12
Introduction
Introduction
This radio controlled wall clock supports reception of the DCF time code signal.
The automatic functions of the movement are:
-
Initial setup,
-
receiving and adjusting of hands during first start,
- checking of internal time during normal time run, adjusting hands position to
correct time, and
-
daily checking of absolute hands position with adjusting if required.
This radio controlled clock movement has two motors and uses 3 hands to show
analogue time. The movement is designed for use with the German time code
transmitter DCF 77 on 77,500 kHz.
Summer-/winter time change takes place automatically.
Information on the DCF77 Time Signal
This radio controlled clocks pick up the time information from the Caesium Atomic
Clock at the Physikalisch-Technische Bundesanstalt at Braunschweig / Germany.
Such Caesium Atomic Clocks have an accuracy of +/- 1 second in 1 million years.
The signal is coded and transmitted from the station at Mainflingen.
The station has an effective range of about 2000 km and broadcasts on a
frequency of 77.5 kHz. If the clock is unable to pick up the signal, it automatically
switches to quartz mode. When the clock picks up the DCF77 signal, it readjusts
itself.
DCF77 stands for
D for Deutschland (Germany), C as indicator for a long wave
signal, F for Frankfurt (Mainflingen is close to Frankfurt), and 77 for the frequency.
Inserting/replacing the Batteries of the Clock
Insert a new battery of the type LR6 (AA) into the battery compartment for the
clock (A11).
Insert two new batteries of the type LR6 (AA) into the battery compartment for
the thermometer (A12).
Pay attention to the proper polarity of the batteries. The polarity is printed
inside the battery compartments accordingly.
Replace the batteries with new batteries of the same type if the display gets
weaker or if the clock runs imprecisely.
