U4224B TEMIC Semiconductors, U4224B Datasheet - Page 13

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

TELEFUNKEN Semiconductors
Rev. A3, 02-Apr-96
Information Regarding British Transmitter
Station: MSF
Frequency 60 kHz
Transmitting power 50 kW
Location: Teddington, Middlesex
Modulation:
The carrier amplitude is switched off at the beginning of
each second for the time of 100 ms (binary zero) or 200
ms (binary one).
0
Example:
March 1993
seconds
5
500 ms
switch over to
the next time frame
0
10
17
500 ms
80
15
18
1
40
20
19
year
TIME FRAME 1 MINUTE
20
20
25
( index count 1 second)
month
10
21
year
30
day of
month
8
22
35
day
of
week
4
Geographical coordinates: 52 _ 22’N, 01 _ 11’W
Time of transmission: permanent, excepting the first tues-
day of each month from 10.00 h to 14.00 h.
Time Code Format:
It consists of 1 minute time frames. A time frame contains
BCD–coded information of year, month, calendar day,
day of the week, hours and minutes. At the switch–over
to the next time frame, the carrier amplitude is reduced for
500 ms duration.
The prescence of the fast code during the first 500 ms at
the beginning of the minute in not guaranteed. The trans-
mission rate is 100 bits/s and the code contains
information of hour, minute, day and month.
23
40
hour
2
24
45
1
minute
25
Parity
check
bits
50
10
26
55
8
27
month
0
4
minute
identifier
BST
hour + minute
day of week
day + month
year
BST 7 GMT change
impending
U4224B
28
TIME FRAME
5
2
29
93 7528
10
1
13 (17)
30