• Country
• United States of America (USA)

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

• Year
• 1935 ??

• Category
• Morse-Equipment & TTY, RTTY, TDD etc.

• Radiomuseum.org ID
• 75687

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Various materials

• from Radiomuseum.org
• Model: Standard Key J-38 - MILITARY U.S. different makers

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 77 x 37 x 158 mm / 3 x 1.5 x 6.2 inch

• Notes
• Standard key for Signal Corps radio/telegraph operator training, also used by aircraft and base radio & telegraph lines. The strange looking binding posts and shorting strap at the back of the key were used to connect a set of headphones to one side of the key ("tel") and the other side of the key ("line") to the training set. The effect was to put the key and headphones in series. The circuit closing switch on the right side of the key was used to set the key for listening (switch closed) or sending (switch open). Mounted on an insulated (bakelite) base. Different manufacturers (e.g. American Hardware, Lionel etc.).

• Net weight (2.2 lb = 1 kg)
• 0.3 kg / 0 lb 10.6 oz (0.661 lb)

• External source of data
• K6IX

• Mentioned in
• Perera's "Telegraph Collectors Guide"

• Author
• Model page created by a member from D. 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)