Bus couplers boxed & inline

The Bus Coupler is connected between the MIL-STD-1553B bus and bus devices (controllers, monitors and terminals). The purpose of the bus coupler is to reduce reflections, protect the bus and maintain impedance of the bus by employing a transformer and a pair of fault-isolation resistors. The transformer with a turn ratio of 1:41:1 maintains the 78 Ohm impedance of the bus, while the resistors protect the bus from the potential shorts from devices on the stub.

The MIL-STD-1553B standard recommends that coupling devices connected directly to the bus without bus couplers should be avoided because of the potential hazards of direct connections and very limited stub lengths (0.3m). Terminators or self-terminating couplers must be used at both ends of the bus. Greenwood bus couplers are available in 1 to 8 stub boxed style and 1 to 4 stub inline models. The boxed couplers employ encapsulated transformers for maximum performance and reliability, and the transformers meet MIL-SPEC requirements. The boxed couplers final assembly utilises a potting compound with low out-gassing characteristics which secures all components in place.

All Greenwood couplers have been tested by Test Systems Inc in accordance with SAE AS4117 to confirm meeting the MIL-STD-1553B specifications. The Greenwood coupler is suitable for test and vehicle applications. Most Greenwood couplers are available from stock, otherwise lead times average two weeks. Greenwood couplers have been established in the UK market for over 10 years, and have been designed into many test rig applications by major UK contractors such as BAE Systems and Westland.

  1. Boxed Bus Couplers
  2. Inline Bus Couplers
  3. Bus Coupler Connectors, Patch Cords and Tools
  4. 1553B Cables