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C-MAX Time Solutions
18 Information on the US Transmitter
(Customer is responsible to verify this information)
Data Sheet
CME8000
Station:
Frequency:
Transmitting power:
WWVB
60 kHz
50 kW
Location:
Geographical coordinates:
Time of transmission:
Time frame 1 minute
Fort Collins/Colorado
40° 40'N, 105° 03' W
permanent
Time frame
(Index count 1 second)
0
5
10
15
20
25
30
35
40
45
50
55
0
5
10
minutes
hours
days
UTI
sign
UTI
correction
(ms)
year
daylight saving time bits
leap second warning bit
leap year indicator bit
FRM = Frame Marker
DST = Daylight savings time bit
0.5s
“1”
0.2s
“0”
0.8s
“P ”
L1 =
Leap year indicator
“1” = non leap year
“0” = leap year
The bit is set to 1 during each leap
P0 - P5 = Position marker
year after January 1 but before
CME8000 digital out:
February 29. It is set back to 0 on
January 1 of the year following the leap year.
0.5s
“1”
0.2s
“0”
0.8s
“1”
L2 =
Leap second warning bit
The bit is set to 1 near the start of the month
in which a leap second is added. It is set to 0
immediately after the leap second insertion.
Example of WWVB data out:
2001 / 258 days / 18 hours / 42 minutes
Protocol Bits
Control Bit
Protocol Identifier
1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4
... 0
... 1
daylight saving time bits
minutes
hours
days
UTI
UTI
year
leap second warning bit
sign
correction
(ms)
leap year indicator bit
Modulation
The carrier amplitude is reduced by 10 dB at the
beginning of each second and is restored within
500 ms (binary one) or within 200 ms (binary
zero) or within 800 ms (position-identifier marker
or frame reference marker).
Time-Code Format
The time-code format consists of 1-minute time
frames. A time frame contains BCD-coded
information of minutes, hours, days and year. In
addition, there are 6 position-identifier markers
(P0 thru P5) and 1 frame-reference marker with
reduced carrier amplitude of 800 ms duration
SPEC No.
CME8000
Revision
B.15
State
09.03.07
C-MAX printed
03.05.2007
Version
English
Page
19 of 22
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