Radio Set SCR-274-N Command Radio

• Country
• United States of America (USA)

• Manufacturer / Brand
• MILITARY U.S. (different makers for same model)

• Year
• 1940

• Category
• Military Transceiver (TRX)

• Radiomuseum.org ID
• 312216

• Picture
• Schematics

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

• 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 Radiomuseum.org
• 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).

  • BC-453-A / B: 190 - 550 kHz
  • BC-454-A / B: 3.0 - 6.0 MHz
  • BC-455-A / B: 6.0-9.1 MHz
  • BC-946-B: 0.52 - 1.5 MHz

  Receiver Control Box

  • BC-450-A: to control three receivers

  Transmitters:

  • BC-696-A: 3.0 - 4.0 MHz
  • BC-457-A: 4.0 - 5.3 MHz
  • BC-458-A: 5.3 - 7.0 MHz
  • BC-459-A: 7.0 - 9.1 MHz

  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.

• Other Models

• Here you find 399 models, 351 with images and 210 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from MILITARY U.S. (different makers for same model)