units. Elements 65 through 68 contain the binary equivalent of tens of
years. In keeping with IRIG formats, the least significant bit occurs first. All
unused Control Functions are filled with a space (Binary 0).
SBS: Word begins at index count 80. Seventeen Straight Binary Coded ele-
ments occur with a position identifier between the 9th and 10th binary
coded elements. Least significant digit occurs first.
Pulse rates:
Element rate: 100 per second.
Position identifier rate: 10 per second.
Reference marker rate: 1 per second.
Element identification: The "on time" reference point for all elements is the
pulse leading edge.
Index marker (Binary 0 or uncoded element): 2 millisecond duration.
Code digit (Binary 1): 5 millisecond duration.
Position identifier: 8 millisecond duration.
Reference marker, 1 per second. The reference marker appears as two con-
secutive position identifiers. The second position identifier marks the on-
time point for the succeeding code word.
Resolution:
Pulse width coded signal: 10 milliseconds.
Amplitude modulated signal: 1 millisecond.
Carrier frequency: 1kHz when modulated.
Table 5-33:
IRIG B control function field
C.F. Element # Digit # Function
50 1 Space
51 2 Space
52 3 Space
53 4 Space
54 5 Space
55 6 Time Sync Status
VersaSync User Manual 379
APPENDIX
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