Displaying Dcf77 Signal; Setting The Exact Time - inout RePlay 01 User Manual

9.4 DISPLAYING DCF77 SIGNAL

The DCF77 signal is broadcast permanently from Mainflingen in Germany and covers
about 2000 Km. This signal is modulated in amplitude with a carrier at 77.5KHz, a
modulation frequency of one bit per second and a length of 59 bits. The scheduled
information is therefore delivered within one minute.
The signal is generally good, but high voltage lines, very high buildings or other
electromagnetic noise sources could make reception discontinuous, especially during day
time when propagation is poorer.
In order to check the quality of the signal being received, you must make sure that the
decoded signal provides only one impulse per second. Press the MENU key for at least
one second, select the function DCF77 SIGNAL via the key > and press ENTER.
MENU function screen display
Function:
DCF77 SIGNAL
Press the MENU key for at least one second to go back to normal display conditions.
IMPORTANT!
If even one bit is corrupted, the checksum will fail and the whole package will be rejected.
Generally, to keep accurate time, a couple of synchronisations every 48 hours are enough.
It is not easy to give suggestions on how to position the antenna for better reception. The
DCF77 signal is subject to attenuation and interferences along the track from the
broadcasting centre to the receiver. These are largely due to the morphology of the terrain
around the receiving antenna, to reflections in the ionosphere and to various kinds of noise
caused by electric equipment near the receiving antenna. You must therefore try to place
the receiver far from any electric equipment, especially computers, TV sets and major
wiring lines of the building.

9.5 SETTING THE EXACT TIME

Press the MENU key for at least one second, select the function CLOCK SETTING via the
key >, press ENTER to change the setting.
Adjust via the keys < or >, confirm by pressing ENTER.
Press the MENU key for at least one second to go back to normal display conditions.
MENU function screen display
Function:
CLOCK ADJ
Replay User Manual v.
DCF77 signal operation state display
DCF77 SIGNAL
Fun1 St. 0 Err 0
Exact time setting screen display
Clock setting
0 "every 10 d.
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1.2
Fun = function going on
St.(Step) = position of the received
bit (0..59), must increment with each
second and correspond to real
seconds .
Err = error code detected.
Exact time setting screen
Clock setting
+3,5"every 10 d.