t4227-fbg3 ATMEL Corporation, t4227-fbg3 Datasheet - Page 11

• Manufacturer Part Number: t4227-fbg3
• Description: Time-code Receiver
• Manufacturer: ATMEL Corporation

Information on the Japanese Transmitter (preliminary)
(Customer is responsible to verify the information!)
Station: JJY
Frequency 40 kHz
Transmitting power 50 kW
Modulation
The carrier amplitude is 100% at the beginning of each
second and is switched to 10% after 500 ms (binary one)
or after 800 ms (binary zero) and to 200 ms for identifier
marker P0 ... P5.
Rev. A2, 24-Jul-00
seconds
0
0.5 s
Example: 18.42 h
59
minutes
P0
“1”
5
0
1
Frame-reference marker (FRM)
Position-identifier marker P0
10
40 20 10
0.8 s
2
“0”
hours
15
3
4
Preliminary Information
20
minutes
5
Time frame 1 minute
8
(index count 1 second)
Time frame
“P”
25
0.2 s
6
da ys
4
7
2
30
Figure 18.
8
1 P1
0.5 second: Binary one
0.8 second: Binary zero
0.2 second: Identifier markers P0...P5
9 10 11 12 13 14 15 16 17 18 19 20
35
Location: Sanwa, Ibaraki
Geographical coordinates: 36_11’ N, 139_51’ E
Time of transmission: permanent
Time-Code Format
The time-code format consists of 1-minute time frames.
A time frame contains BCD-coded information of
minutes, hours, days, weeks and year. In addition, there
are 6 position-identifier markers (P0 thru P5) with
reduced carrier amplitude of 500 ms duration.
Position identifier marker P1
40
year
45
20 10
50
weeks
leap second
hours
55
8
4
0
2
T4227
Time frame
1
5
P2
93 7508 e
10
11 (13)