U4223B ATMEL Corporation, U4223B Datasheet - Page 16

• Manufacturer Part Number: U4223B
• Description: Time-code Receiver With A/d Converter
• Manufacturer: ATMEL Corporation

Information on the Japanese Transmitter
Station: JG2AS
Frequency 40 kHz
Transmitting power 10 kW
Modulation
The carrier amplitude is 100% at the beginning of each
second and is switched off after 500 ms (binary one) or
after 800 ms (binary zero).
U4223B
16 (18)
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
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 27.
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 and days. In addition, there are 6 position-
identifier markers (P0 thru P5) and 1 frame-reference
markers (FRM) with reduced carrier amplitude of 800 ms
duration.
code
Position identifier marker P1
40
dut1
45
20 10
50
hours
55
8
4
0
Rev. A7, 06-Mar-01
2
Time frame
1
5
P2
10