24.2 Standard frequency formats
600 Hz tone
MSF Rugby
Time is inserted in the 60 kHz transmission in two ways, illustrated below.
Fast-code
transmission
Minute identifier1 0 Data
11 1
515253545556575859
0 1 2 3 4 5 6 7 8DUT10 Seconds past
1 each minute transmission 29
Minute4 50 108 4910
48 11
4712
2046 13
40 45 14
1 44 15
2 43 16
4 421780 Leap
Hour
8
41 18
40 second 40 19
20 insertion
10 39 20 20 38 21 10
1 37 22
24
23 4 Day of week
1 2 8 Year
2 4 363534333231302928
27268 10 1 2
4 8 10 20 1 2 4 Day of month Month
Slow code time and date information is transmitted between the 17th and 59th seconds of the minute-long cycle, in normal BCD coding. Fast code time and date BCD coded information is inserted into a 500 ms window in the first second of each minute-long cycle, as illustrated below.
Time of day
Marker bit Parity bitControl pulse 10 hr hr 10 min min Day of month
BST on 10 monthParity bit10 day day Month
2184214 18421 21842118421
60 kHz60 kHzcarrier carrier
0 25 45 50 200 330 Minute edge
500 ms