IRIG Carrier Frequencies
Each IRIG code specifies a carrier frequency that is modulated to encode date and time, as well as control bits to time-stamp events. Initially, IRIG applications were primarily military and government associated. Today, IRIG is commonly used to synchronize voice loggers, recall recorders, and sequential event loggers found in emergency dispatch centers and power utilities.
Available IRIG output signals
Format | Encoding | Modulation | Carrier | Coded Expressions | Bit rate | Time Frame Interval |
---|---|---|---|---|---|---|
IRIG-A | ||||||
IRIG-A | A000 | DCLS | N/A | BCDTOY, CF and SBS | 1000 pps | 0.1 sec |
IRIG-A | A001 | DCLS | N/A | BCDTOY, CF | 1000 pps | 0.1 sec |
IRIG-A | A002 | DCLS | N/A | BCDTOY | 1000 pps | 0.1 sec |
IRIG-A | A003 | DCLS | N/A | BCDTOY, SBS | 1000 pps | 0.1 sec |
IRIG-A | A004 | DCLS | N/A | BCDTOY, BCDYEAR, CF and SBS | 1000 pps | 0.1 sec |
IRIG-A | A005 | DCLS | N/A | BCDTOY, BCDYEAR, and CF | 1000 pps | 0.1 sec |
IRIG-A | A006 | DCLS | N/A | BCDTOY, BCDYEAR | 1000 pps | 0.1 sec |
IRIG-A | A007 | DCLS | N/A | BCDTOY, BCDYEAR, and SBS | 1000 pps | 0.1 sec |
IRIG-A | A130 | AM | 10 kHz | BCDTOY, CF and SBS | 1000 pps | 0.1 sec |
IRIG-A | A131 | AM | 10 kHz | BCDTOY, CF | 1000 pps | 0.1 sec |
IRIG-A | A132 | AM | 10 kHz | BCDTOY | 1000 pps | 0.1 sec |
IRIG-A | A133 | AM | 10 kHz | BCDTOY, SBS | 1000 pps | 0.1 sec |
IRIG-A | A134 | AM | 10 kHz | BCDTOY, BCDYEAR, CF and SBS | 1000 pps | 0.1 sec |
IRIG-A | A135 | AM | 10 kHz | BCDTOY, BCDYEAR, and CF | 1000 pps | 0.1 sec |
IRIG-A | A136 | AM | 10 kHz | BCDTOY, BCDYEAR | 1000 pps | 0.1 sec |
IRIG-A | A137 | AM | 10 kHz | BCDTOY, BCDYEAR, and SBS | 1000 pps | 0.1 sec |
IRIG-B | ||||||
IRIG-B | B000 | DCLS | N/A | BCDTOY, CF and SBS | 100 pps | 1 sec |
IRIG-B | B001 | DCLS | N/A | BCDTOY, CF | 100 pps | 1 sec |
IRIG-B | B002 | DCLS | N/A | BCDTOY | 100 pps | 1 sec |
IRIG-B | B003 | DCLS | N/A | BCDTOY, SBS | 100 pps | 1 sec |
IRIG-B | B004 | DCLS | N/A | BCDTOY, BCDYEAR, CF and SBS | 100 pps | 1 sec |
IRIG-B | B005 | DCLS | N/A | BCDTOY, BCDYEAR, and CF | 100 pps | 1 sec |
IRIG-B | B006 | DCLS | N/A | BCDTOY, BCDYEAR | 100 pps | 1 sec |
IRIG-B | B007 | DCLS | N/A | BCDTOY, BCDYEAR, and SBS | 100 pps | 1 sec |
IRIG-B | B120 | AM | 1 kHz | BCDTOY, CF and SBS | 100 pps | 1 sec |
IRIG-B | B121 | AM | 1 kHz | BCDTOY, CF | 100 pps | 1 sec |
IRIG-B | B122 | AM | 1 kHz | BCDTOY | 100 pps | 1 sec |
IRIG-B | B123 | AM | 1 kHz | BCDTOY, SBS | 100 pps | 1 sec |
IRIG-B | B124 | AM | 1 kHz | BCDTOY, BCDYEAR, CF and SBS | 100 pps | 1 sec |
IRIG-B | B125 | AM | 1 kHz | BCDTOY, BCDYEAR, and CF | 100 pps | 1 sec |
IRIG-B | B126 | AM | 1 kHz | BCDTOY, BCDYEAR | 100 pps | 1 sec |
IRIG-B | B127 | AM | 1 kHz | BCDTOY, BCDYEAR, and SBS | 100 pps | 1 sec |
IRIG-E | ||||||
IRIG-E | E000 | DCLS | N/A | BCDTOY, CF and SBS | 10 pps | 1 sec |
IRIG-E | E001 | DCLS | N/A | BCDTOY, CF | 10 pps | 1 sec |
IRIG-E | E002 | DCLS | N/A | BCDTOY | 10 pps | 1 sec |
IRIG-E | E003 | DCLS | N/A | BCDTOY, SBS | 10 pps | 1 sec |
IRIG-E | E004 | DCLS | N/A | BCDTOY, BCDYEAR, CF and SBS | 10 pps | 1 sec |
IRIG-E | E005 | DCLS | N/A | BCDTOY, BCDYEAR, and CF | 10 pps | 1 sec |
IRIG-E | E006 | DCLS | N/A | BCDTOY, BCDYEAR | 10 pps | 1 sec |
IRIG-E | E007 | DCLS | N/A | BCDTOY, BCDYEAR, and SBS | 10 pps | 1 sec |
IRIG-E | E110 | AM | 100 Hz | BCDTOY, CF and SBS | 10 pps | 1 sec |
IRIG-E | E111 | AM | 100 Hz | BCDTOY, CF | 10 pps | 1 sec |
IRIG-E | E112 | AM | 100 Hz | BCDTOY | 10 pps | 1 sec |
IRIG-E | E113 | AM | 100 Hz | BCDTOY, SBS | 10 pps | 1 sec |
IRIG-E | E114 | AM | 100 Hz | BCDTOY, BCDYEAR, CF and SBS | 10 pps | 1 sec |
IRIG-E | E115 | AM | 100 Hz | BCDTOY, BCDYEAR, and CF | 10 pps | 1 sec |
IRIG-E | E116 | AM | 100 Hz | BCDTOY, BCDYEAR | 10 pps | 1 sec |
IRIG-E | E117 | AM | 100 Hz | BCDTOY, BCDYEAR, and SBS | 10 pps | 1 sec |
IRIG-E | E120 | AM | 100 Hz | BCDTOY, CF and SBS | 10 pps | 1 sec |
IRIG-E | E121 | AM | 1kHz | BCDTOY, CF | 10 pps | 10 sec |
IRIG-E | E122 | AM | 1kHz | BCDTOY | 10 pps | 10 sec |
IRIG-E | E123 | AM | 1kHz | BCDTOY, SBS | 10 pps | 10 sec |
IRIG-E | E124 | AM | 1kHz | BCDTOY, BCDYEAR, CF and SBS | 10 pps | 10 sec |
IRIG-E | E125 | AM | 1kHz | BCDTOY, BCDYEAR, and CF | 10 pps | 10 sec |
IRIG-E | E126 | AM | 1kHz | BCDTOY, BCDYEAR | 10 pps | 10 sec |
IRIG-E | E127 | AM | 1kHz | BCDTOY, BCDYEAR, and SBS | 10 pps | 10 sec |
IRIG-G | ||||||
IRIG-G | G001 | DCLS | N/A | BCDTOY, CF | 10000 pps | 10 msec |
IRIG-G | G002 | DCLS | N/A | BCDTOY | 10000 pps | 10 msec |
IRIG-G | G005 | DCLS | N/A | BCDTOY, BCDYEAR, and CF | 10000 pps | 10 msec |
IRIG-G | G006 | DCLS | N/A | BCDTOY, BCDYEAR | 10000 pps | 10 msec |
IRIG-G | G141 | AM | 100 kHz | BCDTOY, CF | 10000 pps | 10 msec |
IRIG-G | G142 | AM | 100 kHz | BCDTOY | 10000 pps | 10 msec |
IRIG-G | G145 | AM | 100 kHz | BCDTOY, BCDYEAR, and CF | 10000 pps | 10 msec |
IRIG-G | G146 | AM | 100 kHz | BCDTOY, BCDYEAR | 10000 pps | 10 msec |
IRIG-H | ||||||
IRIG-H | H002 | DCLS | N/A | BCDTOY | 1 pps | 1 sec |
IRIG-H | H122 | AM | 1KHz | BCDTOY | 1 pps | 1 sec |
NASA-36 | ||||||
NASA-36 | N/A | AM | 1msec | UNKNOWN | 100 pps | 1 sec |
NASA-36 | N/A | DCLS | 10 msec | UNKNOWN | 100 pps | 1 sec |
The Spectracom IRIG formats use the control functions for BCD year information and a Time Sync Status bit and in format E the control functions are used for straight binary seconds (SBS). Refer to individual IRIG Time Code description figures and text. IRIG Standard 200-98 format B had 27 control bits and format E had 45 bits for control functions. These control bits could be used for any use and there was no defined function. Spectracom used the control function element at index count 55 as the TIME SYNC STATUS and the sub-frame after position identifiers P6 and P7 as the year info and for format E the sub-frame after P8 and P9 for the straight binary seconds (SBS). The position of the BCD year information does not conform to the newer IRIG Standard 200-04. IRIG Standard 200-04 incorporated the year information after P5 and reduced the allocated control bits to 18 for format B and 36 for format E.
Note: DCLS is DC Level Shifted output, pulse width modulated with a position identifier having a positive pulse width equal to 0.8 of the reciprocal of the bit rate, a binary one (1) having a positive pulse width equal to 0.5 of the reciprocal of the bit rate and a binary zero (0) having a positive pulse width equal to 0.2 of the reciprocal of the bite rate.
SecureSync can provide various IRIG code in amplitude modulated (AM) or pulse width coded (TTL) formats, depending on your unit configuration and additional options. A signature control feature may be enabled for any IRIG output. Signature control removes the modulation code when a Time Sync Alarm is asserted.