Radio Frequency by Steve Winder and Joe Carr - HTML preview

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 identifier_{1 0 Data}
1^{1 1}
515253545556575859
^{0 1 2} 3 4 5 6 7 8^{DUT10 Seconds past}
₁ each minute transmission 2₉
Minute^{4 50} 10_{8 49}

10
48 11
47¹²

20₄₆ 13
40 45 14
1 44 15
₂ 43 16
₄ 42¹⁷₈₀ Leap

Hour
8
41 18₄₀ second 40 19₂₀ insertion_{10 39 20}
20 38 21 10 ₁ 37 22
24^{23 4}
Day of week_{1 2}
8 Year
^{2 4 3635343332}31302928²⁷²⁶8 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 month_{Parity bit10 day day Month}
2184214 18421 21842118421
60 kHz_{60 kHzcarrier carrier}
0 25 45 50 200 330 Minute edge
500 ms