PMR/TRQ-3/U Range Timing Receiver Rackmount 73B100 IRIG-B Pacific Missile Range

PMR/TRQ-3/U Range Timing Receiver Rackmount 73B100 IRIG-B Pacific Missile Range

The PMR/TRQ-3/U is a military-grade Range Timing Radio Receiver built for use in missile range instrumentation systems. Designated part number 73B100 and assembly 13672ASSY, this unit was part of the PMR/TD-29/TRQ timing system operated by the HQ Pacific Missile Range Technical Support Department. It receives and distributes IRIG-B time code signals used to synchronize instrumentation across range assets during test and evaluation operations.

Specifications & What's Included

• Model: PMR/TRQ-3/U
• Part Number / MPN: 73B100
• Assembly Number: 13672ASSY
• Part of System: PMR/TD-29/TRQ
• Serial Number: 74-013 (see internal records)
• Organization: HQ Pacific Missile Range, Technical Support Dep.
• Form Factor: Rackmount (bench-style rack chassis)
• Timing Standard: IRIG-B
• Rear Connectors: J7 Antenna (BNC), J8 (1H), J9–J11 IRIG-B Timing outputs
• Output Connectors: J4 Timing (A GND, B IRIG-E, C-K IRIG-B), J5 LED (A GND, B Anode IRIG-E, C-K Anode IRIG-B), J6 Neon (A GND, B IRIG-E, C-K IRIG-B)
• Front Panel: Timing Channel rotary selector (CL-B, PM-E, PM-B, SNI-B, OFF), Antenna BNC connector, numeric display
• Chassis: Aluminum, natural finish with ventilation perforations on top cover
• Unit only — no cables or accessories observed in photos

Applications

The PMR/TRQ-3/U was designed for missile range timing and instrumentation use at the Pacific Missile Range (now part of the Pacific Missile Range Facility, Barking Sands, Hawaii). Range timing receivers like this one receive IRIG-B time code — a standardized analog or digital time-of-day signal — and distribute synchronized timing pulses to radar, telemetry, optical tracking, and data recording systems across a test range. IRIG-B (Inter-Range Instrumentation Group format B) was developed in the 1950s and 1960s by the U.S. military's Range Commanders Council specifically for synchronizing instrumentation across geographically dispersed range assets during weapons and missile test events. The PMR/TD-29/TRQ system, of which this receiver is a component, was part of the ground-based time distribution infrastructure supporting those test operations. Today, units like this are sought by military surplus collectors, range instrumentation historians, aerospace museums, and engineers working on vintage IRIG-B compatible systems.