• Country
• United States of America (USA)

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

• Year
• 1941–1945

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 71778

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

• Number of Tubes
• 3

• Valves / Tubes
• VT-167 VT-116 VT-116

• Wave bands
• Wave Bands given in the notes.

• Power type and voltage
• Dry Batteries / 135/6 Volt

• Loudspeaker
• - only for Earphone!

• Material
• Various materials

• from Radiomuseum.org
• Model: SCR-211-BC-221- - MILITARY U.S. different makers

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

• Dimensions (WHD)
• 10.5 x 15 x 9.75 inch / 267 x 381 x 248 mm

• Notes
• Precision heterodyne frequency meter designed to measure or radiate radio-frequency impulses between 125 kHz and 20 MHz. Portable, self-contained, used mainly to calibrate field radio receivers and transmitters by direct comparison with the crystal-calibrated variable frequency oscillator of the instrument. Frequency readings provided by a calibration book. In 1941-1945, there were 25 different BC-221 models produced with suffix letters A, B, C, D, E, F, J, K, L, M, N, O, P, Q, R, T, AA, AC, AE, AF, AG, AH, AJ, AK and AL. Each model letter denoted a different military order and(or) different manufacturer - Allen D. Cardwell, Bendix Radio, Philco, Rauland or Zenith Radio. All of the BC-221 models were similar as far as basic operation was concerned, but there were many differences in the mechanical arrangement of the cabinets and controls as well as in electrical circuit design. Supplied with wooden or aluminum-alloy metal cabinet. Required P-18, P-20 or HS-30 headset. Sample Dimensions, Valves and Weight are given for model BC-221-AK of Philco in a wooden cabinet. Please refer to the individual BC-221 model pages to add your images and to post forum entries and questions.

• Net weight (2.2 lb = 1 kg)
• 36 lb (36 lb 0 oz) / 16.344 kg

• Mentioned in
• -- Original-techn. papers. (- - -)

• Literature/Schematics (1)
• TM 11-300 (20 July 1944)

• Author
• Model page created by a member from D. See "Data change" for further contributors.

• Other Models

• Here you find 398 models, 350 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)