Radio Set SCR-274-N Command Radio

MILITARY U.S. (different makers for same model)

  • Year
  • 1940
  • Category
  • Military Transceiver (TRX)
  • ID
  • 312216

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Main principle
  • Transceiver
  • Wave bands
  • Short Wave (SW only)
  • Power type and voltage
  • Storage Battery for all (e.g. for car radios and amateur radios) / 28 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case
  • from
  • Model: Radio Set SCR-274-N [Command Radio] - MILITARY U.S. different makers
  • Shape
  • Miscellaneous shapes - described under notes.
  • Notes
  • Radio Set SCR-274-N, Command Radio.

    Communications equipment in modular construction for aircraft use.

    Receivers (Suffix A: 8000 Ohms output; Suffix B 8000 / 600 Ohms output) (powered by Dynamotor DM-32-A) (Adaptor FT-230-A for remote control, Adaptor FT-260-A for local control).

    Receiver Control Box

    • BC-450-A: to control three receivers


    Modulator Unit (powered by Dynamotor DM-33-A)

    • BC-456-A (to modulate several transmitters)

    Radio Control Box (to control up to four transmitters)

    • BC-451-A

    Antenna Relay Unit

    • BC-442-A

    Matching headsets / microphones

    • Microphone T-17
    • Headset HS-33

    Matching Test Sets

    • RC-54-A
    • RC-55-A

    The "Type K Command Radio" had been developed in 1936/37 as a modular communications system for Aircraft use (with separate receivers for separate wavebands, separate transmitters, control boxes and accessories),  and had been tested and improved for military use from 1939 on. In 1940, the U.S. Navy started  installing the equipment as RAT / RAV sets and the U.S. Army Air Corps introduced the equipment as SCR-274-N after May 1940.

    From these sets and it's successors AN/ARC-5 some 1,450,000 sets have been produced. Many of these have been sold as surplus and modified by hams in the postwar years, so sets in original condition are becoming rare.


  • Mentioned in
  • -- Original-techn. papers. (AN 08-40SCR274-2)
  • Author
  • Model page created by Martin Bösch. See "Data change" for further contributors.

 Collections | Museums | Literature


The model Radio Set is part of the collections of the following members.