Product Overview
TRB Straight Twinaxial Plug for Belden 89272 Cable - 3-Lug Bayonet, 500 MHz, Wrench-Crimp Shield, Gold Concentric Pins
Condition
Unused NOS. Sourced from a government research facility and supplied in original manufacturer's packaging with assembly instructions. Body, coupling ring, center pin, dielectric inserts, gasket, and hex nut all present. Made in the USA. Torque specification 25-35 in-lb is printed on the included instruction sheet.
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Product Overview
Trompeter PL75-55 is a high-reliability TRB straight twinaxial plug connector with 3-lug bayonet coupling, engineered specifically for Belden 89272 shielded twinax cable. Machined brass body with bright nickel plating, gold-plated beryllium copper concentric center pin sockets, and wrench-crimp shield termination. Rated to 500 MHz and 400V. Built to the performance requirements of military telemetry, defense aerospace instrumentation, and precision metrology applications. Also sold and cross-referenced as Cinch Connectivity Solutions PL75-55, DigiKey 1097-1261-ND, NSN 5935-01-381-0026.
Key Features
- Connector type: TRB straight twinaxial/triaxial plug
- Coupling mechanism: 3-lug bayonet
- Cable compatibility: Belden 89272 shielded twinax cable
- Termination: Wrench-crimp shield, solder/crimp center pin
- Maximum frequency: 500 MHz
- Operational voltage: 400V
- Body: Machined brass with bright nickel plating
- Center contacts: Gold-plated beryllium copper concentric pin sockets
- Assembly torque spec: 25-35 in-lb (per included instruction sheet)
- Made in the USA
- Part of the Trompeter 70/370 series
Applications
- Aerospace and defense technician replacing a damaged twinax plug on a MIL-STD-1553B data bus cable assembly - cuts the failed connector, preps the Belden 89272 cable, wrench-crimps the shield, and solders the center pins to restore signal integrity before returning the system to service
- Calibration lab engineer terminating a custom cable for a legacy analog metrology bench - needs the dual concentric isolation of the TRB format to keep noise out of sensitive baseband measurement circuits
- Repair depot tech building up a stock of connector hardware for scheduled depot-level maintenance on airborne telemetry systems where downtime is not an option
- Electronics hobbyist or experimenter working with salvaged twinax test equipment who needs the correct 3-lug TRB plug to mate with legacy bench gear
Frequently Asked Questions
What cable does the PL75-55 terminate onto?
It is designed specifically for Belden 89272 shielded twinaxial cable. The wrench-crimp shield termination and center pin dimensions are matched to that cable's geometry. Other twinax cables with different outer diameters or conductor spacing may not seat correctly.
What mating connector does this plug couple to?
It mates with a TRB jack or receptacle that has a 3-lug bayonet coupling mechanism. Two-lug TRB receptacles are not compatible - the lug count and alignment are different.
What tools are required for termination?
A wrench-crimp tool for the shield termination and standard soldering or crimping tools for the center pin. The assembly instruction sheet included in the package shows the 5-step process and calls for 25-35 in-lb of torque on the coupling.
Is this the same connector sold under the Cinch Connectivity Solutions name?
Yes. Trompeter was acquired by Cinch Connectivity Solutions. The PL75-55 is the same connector under both brand names. DigiKey lists it as 1097-1261-ND; it also carries NSN 5935-01-381-0026 for government procurement reference.
Will this work with standard coaxial cable like RG-58?
No. The PL75-55 is a twinaxial/triaxial connector with two concentric center contacts. It is not compatible with standard single-conductor coaxial cables or BNC/SMA ecosystems.
Government surplus stock, unused, still carrying its assembly sheet - this is the connector that belongs on the bench of someone who gets signal integrity right the first time.
