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The KAM/TCG/105 can accept time from an IRIG-B time source, from its onboard GPS receiver (external antenna required), or from an external GPS receiver outputting NMEA messages and a one PPS signal. The received time is written to an internal timer and to a Real-Time Clock (RTC) that maintains time during power-down. The time can be used for synchronization of a distributed Acra KAM-500 data acquisition system. The module generates IRIG-B outputs to allow external devices to synchronize with the Acra KAM-500 system.

The module comprises a GPS reader and an IRIG reader which decode incoming signals. The IRIG reader extracts control functions and straight binary seconds as well as time. The GPS reader parses NMEA messages as they are generated by the receiver. Extracted navigation data such as position, altitude, velocity, and heading are available as individual parameters. The module can also be synchronized via NMEA messages being sent over RS-232 from a third-party GPS or PC with granularity of one second.

The timer block is a 4 x 16-bit Binary Coded Decimal (BCD) counter with microsecond resolution. For example, at 1μs before midnight on January 1, the timer would read 0001 23:59 59.99 9999.


  • Synchronizes with IRIG-B or GPS
  • 1 μs time resolution
  • Less than three parts per million drift when acting as a generator
  • Time is maintained on an internal battery during power-off
  • GPS navigation information is available
  • Secondary time source input


  • System synchronization
  • Parameter time tagging
  • Global positioning
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