2: System Specifications
1 PPS Out
A time-stable 1 PPS (one pulse per second) output is provided. If no reference is available,
the 1 PPS pulse will be as stable as the internal oscillator.
Pulse width:
20 mS +/-1 mS
On time edge: Rising
Accuracy:
Refer to “Time and Frequency Accuracy” on page4
Amplitude:
TTL Levels into 50 W
Qty: 1
Connector: BNC female
Code Out
The default output is IRIG-B-120 AM. Configuration is via the Keypad, Serial I/O, and
Network port.
Format:
IRIG B-120, B000, B120 1344, B000 1344
IRIG-A130, A000
NASA 36
Amplitude (AM):
3 Vp-p, into 50 W +/-10%
Ratio (AM): 3:1 +/-10%
Amplitude (DC):
TTL into 50 W
Qty: 1
Connector: BNC female
Phasing:
In phase with carrier ± 10 mS
Accuracy:
Refer to “Time and Frequency Accuracy” on page4
Five flags are encoded in the control function segment of the IRIG B code, (IRIG B-120,
B000, B120 1344, B000 1344). The first flag encoded at element P5+40ms is the LOCK
indicator. It is a binary 1 when the reference source has become unlocked. The second flag
encoded at element P5+60ms is a binary 1 when the worst case time error exceeds
threshold 1 element P5+70ms is a binary 1 when the worst case time error exceeds
threshold 2. Element P5+80ms encodes a binary 1 when the error exceeds threshold 3 and
P5+90ms when the error exceeds threshold 4.
The time code resets as follows:
Page 8 of 221 .................................098-00116-000 Rev. A
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