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Radio Set SCR-274-N so called "Command Set"

Radio Set SCR-274-N; MILITARY U.S. (ID = 2414136) Military Radio Set SCR-274-N; MILITARY U.S. (ID = 2413616) Military
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Radio Set SCR-274-N; MILITARY U.S. (ID = 2414136) Military
MILITARY U.S.: Radio Set SCR-274-N [Military] ID = 2414136 1200x1052
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For model Radio Set SCR-274-N so called "Command Set", MILITARY U.S. (different makers for same model):
SCR-274: zwei Sender im Mounting FT-226-A
Country:  United States of America (USA)
Manufacturer / Brand:  MILITARY U.S. (different makers for same model)
Year: 1940 Category: Military Equipment
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.
Power out
from Model: Radio Set SCR-274-N [so called "Command Set"] - MILITARY U.S. different makers
Material Metal case
Shape Miscellaneous shapes - described under notes.

Radio Set SCR-274-N, so called "Command Set":

Communications equipment for aircraft use in modular construction:

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 Equipment" had been developed as a modular communications system for Aircraft use (with separate receivers for separate wavebands, separate transmitters, control boxes and accessories) in 1936/37 and has 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)

Model page created by Martin Bösch. See "Data change" for further contributors.

All listed radios etc. from MILITARY U.S. (different makers for same model)
Here you find 339 models, 292 with images and 165 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.