• Country
• United States of America (USA)

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

• Year
• 1942–1957 ?

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 137183

• Wave bands
• Wave Bands given in the notes.

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: I-129-B Frequency Meter Set - MILITARY U.S. different makers

• Shape
• Portable set > 8 inch (also usable without mains)

• Dimensions (WHD)
• 340 x 140 x 90 mm / 13.4 x 5.5 x 3.5 inch

• Notes
• Absorption frequency meter, military version of the James Millen 90601. Metal case with four LC tuning units inside.
  No. 1, tunes from 1.5 to 3.5 MHz.
  No. 2, tunes from 3.5 to 8.0 MHz.
  No. 3, tunes from 8.0 to 18.5 MHz.
  No. 4, tunes from 18 to 40 MHz. The Frequency Meter Set I-129-B was used for instance for the system SCR-508 for tanks like M5 Stuart, M7 Priest, M10 Wolverine, M24 Chaffee, M4 Sherman, M7 MT, T1 heavy, M36 Slugger, M4A3E2, M4A3E8 Sherman, M6, T20, T25 AT, T29, M26 Pershing, T23, T28, T32, M46 Patton, T34, T95.
  
  The military Radio Set SCR-508 consists basically of Radio Transmitter BC-604 and two Radio Receivers BC-603. BC-604: 10 preset channels for FM voice with power output of 30 watts, frequency 27.9 Mc. Receiver BC-603: Superhet with IF 2.65 Mc, frequency 20 to 27.9 Mc. Further items which we list is the Frequency Meter Set I-129-B and the FM Signal Generator I-208.

• Source of data
• - - Data from my own collection

• Author
• Model page created by Emilio Ciardiello. See "Data change" for further contributors.

• Other Models

• Here you find 393 models, 345 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)