U4224B TEMIC Semiconductors, U4224B Datasheet - Page 14

• Manufacturer Part Number: U4224B
• Description: Time Code Receiver
• Manufacturer: TEMIC Semiconductors

Information Regarding US Transmitter
Station: WWVB
Frequency 60 kHz
Transmitting power 10 kW
Modulation:
The carrier amplitude is reduced 10 dB at the beginning
of each second and is restored in 500 ms (binary one) or
in 200 ms (binary zero).
U4224B
Example: UTC 18.42 h
14 (17)
seconds
0
P0
minutes
0
5
1
40 20 10
Frame reference marker
10
2
3
hours
15
4
minutes
20
5
TIME FRAME 1 MINUTE
TIME FRAME
8
6
25
( index count 1 second)
4
7
days
2
30
8
1 P1
9 10 11 12 13 14 15 16 17 18 19 20
35
sign correction
UTI UTI
Location: Fort Collins
Geographical coordinates: 40 _ 40’N, 105 _ 03’W
Time of transmission: permanent.
Time Code Format:
It 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.
40
45
20 10
year
50
hours
TELEFUNKEN Semiconductors
55
8
4
0
2
daylight savings time bits
leap second warning bit
leap year indicator bit
”0” = non leap year
”1” = leap year
TIME FRAME
Rev. A3, 02-Apr-96
5
1
93 7529 e
P2
10