TPRO-PMC Timecode Reader-Generator0 pages

Timecode Reader/Generator
Model TPRO-PMC

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IRIG-A, IRIG-B, NASA36 timecode reader

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IRIG-B timecode generator

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Time-Tag input

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Freewheel capability

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Programmable periodic output (pulse/
squarewave) and interrupt capability

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Programmable start/stop time output and
interrupt capability

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High-performance, 2.5 ppm oscillator

The TPRO-PMC provides high-accuracy timing functions on a plug-in board with a PMC
interface. The board’s on-board clock is kept in sync to an external timecode input. Several
timing functions are derived from the onboard clock, including a programmable periodic
pulse rate output (“heartbeat”), a programmable start/stop output (“match”), a selectable
frequency output (“oscillator out” at 1 kHz, 1, 5, or 10 MHz), and a time-stamping input
(“time-tag”).
The TPRO-PMC obtains time from an input timecode, which can be IRIG-B or IRIG-A format.
The board detects the format that is being used automatically. An AGC circuit on the time
code input accommodates a wide range of input amplitudes.
The timecode conveys the day, hour, minute, and second. The on-board 10 MHz oscillator is
disciplined to the time code input carrier frequency. The board provides an IRIG-B timecode
that is in-sync with the incoming timecode output.
The TPRO-PMC can be used as a stand-alone timecode generator. The computer programs
the day, hour, minute, and second. The board then continues to count from that time, using
the on-board oscillator as the timebase reference. This is called “freewheeling.”

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