Preliminary Data Sheet
CME6005 C-MAX
SPEC No.
CME6005
Revision
A.7
State
07.12.04
C-MAX printed
07.12.2004
Version
English
Page
9 of 16
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
(Index count 1 second)
Time frame 1 minute
Time frame
coding
when
required
minutes
hours
Calendar
day
year
day
of
the
week
month
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
S1
2
4
8
10
20
40
P1
12
4
8
10
20
P2
minutes
Start Bit
Parity Bit P1
hours
Parity Bit P2
Example: 19.35h
seconds
Figure 15.
M =
Minute marker (100ms)
R =
Second marker (200ms = transmission by reserve antenna)
A1 =
Announcement of change-over to summer-time or vice versa)
Z1 =
DST (summertime = 200ms, otherwise 100ms)
Z2 =
DST (wintertime = 200ms, otherwise 100ms)
A2 =
Announcement of leap second
S =
Startbit of time code information
P1-P3 = Parity check bits
11 Information on the German Transmitter
(Customer is responsible to verify this information)
Station:
DCF 77
Location:
Mainflingen/Germany
Frequency:
77.5 kHz
Geographical coordinates:
50° 01'N, 09° 00'E
Transmitting power:
50 kW
Time of transmission:
permanent
Modulation
The carrier amplitude is reduced to 25% at the
beginning of each second for a period of 100 ms
(binary zero) or 200 ms (binary one), except the
59
th second.
Time-Code Format (based on Information
of Deutsche Bundespost)
The time-code format consists of 1-minute time
frames. There is no modulation at the beginning of
the 59
th second to indicate the switch over to the
next 1-minute time frame. A time frame contains
BCD-coded information of minutes, hours,
calendar day, day of the week, month and year
between the 20
th second and 58th second of the
time frame, including the start bit S (200 ms) and
parity bits P1, P2 and P3. Furthermore, there are
5 additional bits R (transmission by reserve
antenna), A1 (announcement of change-over to
summer time), Z1 (during summer time 200 ms,
otherwise 100 ms), Z2 (during winter time 200 ms,
otherwise 100 ms) and A2 (announcement of leap
second) transmitted between the 15
th second and
19
th second of the time frame.
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