U4221B

Preliminary Information

TELEFUNKEN Semiconductors

Rev. A1, 15-May-96

9 (12)

Information Regarding British Transmitter

Station: MSF

Frequency 60 kHz

Transmitting power 50 kW

Location: Teddington, Middlesex

Geographical coordinates: 52

_ 22’N, 01_ 11’W

Time of transmission: permanent, excepting the first

Tuesday of each month from 10.00 h to 14.00 h.

05

10

15

20

25

30

40

50

55

05

10

35

45

year

day of

month

month

day

of

week

hour

minute

minute

identifier

hour + minute

day of week

day + month

year

TIME FRAME 1 MINUTE

TIME FRAME

( index count 1 second)

Parity

check

bits

BST

BST 7 GMT change

impending

500 ms

500 ms

switch over to

the next time frame

80

40

20

10

42

1

10

8

8

4

2

1

18

19

20

21

22

23

24

25

26

27

28

29

30

year

month

17

seconds

93 7528

0

1

Example:

March 1993

Modulation:

The carrier amplitude is reduced at the beginning of each

second for the time of 100 ms (binary zero) or 200 ms

(binary one).

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.