The IRIG-B time code protocol is used in military, government, power industry, and many other commercial and industrial applications to ensure precise time synchronization. Time information is pulse-width coded in either a BCD or binary format.
IRIG-B is usually distributed as DC-level shifts, pulse-width coded signal (“unmodulated IRIG-B”) suitable for direct connection into digital systems or as an amplitude-modulated signal based on a sine wave carrier with a frequency of 1kHz (“modulated IRIG-B”) suitable for recording onto magnetic tape or for transmission over some other bandlimited medium. While the IRIG 200-04 standard does not define specific signal levels or application details, IRIG-B is typically distributed as an unmodulated TTL-level signal over shielded twisted-pair or coaxial cable.
Masterclock manufactures several devices that can generate IRIG-B time code.
GPS500 GPS Time Code Generator
The GPS500 is a precision IRIG-B time code generator. It receives reference time information from atomic clocks in GPS satellites, extracting timing reference from these signals, and generates time code synchronized to less than 10 microseconds of UTC (Universal Coordinated Time). If the GPS500 loses connection to GPS satellites, it reverts to an internal TCXO. The GPS500 generates IRIG-B in 1kHz modulated and un-modulated (pulse-width coded) format.
The GPS500 also outputs: SMPTE, EBU:30, 25 or 24fps, PPS, NMEA, Kinemetrics/Truetime protocol, and date-encoded references (IRIG 1344 and SMPTE Leitch date format or 309M)
TCO100 Time Code Generator
The TCO100 is a high quality, standalone source of precision time code and time interval. When operated as a stand-alone oscillator and time code source, the internal clock can be set with front panel switches or via RS232 control and will maintain stable time and frequency for long periods of time without calibration. When combined with a GPS500 master clock receiver/generator, the TCO100 will deliver accurate & precise time virtually anywhere in the world.
The TCO100 generates IRIG-B in both a 1kHz modulated and unmodulated (pulse-width coded) format, as well as SMPTE - 24, 25 or 30 fps NDF (Non Drop-Frame).