Receiver BC-603-(*) part of SCR-508, SCR-528

• Country
• United States of America (USA)

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

• Year
• 1942–1957 ?

• Category
• Military Receiver

• Radiomuseum.org ID
• 85123

• Picture
• Schematics

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

• Number of Tubes
• 10

• Valves / Tubes
• 6AC7 6AC7 12SG7 6J5 12SG7 12SG7 6H6 6SL7GT 6SL7GT 6V6GT

• Main principle
• Superhet with RF-stage; ZF/IF 2650 kHz; 2 AF stage(s)

• Wave bands
• Wave Bands given in the notes.

• Power type and voltage
• Storage Battery for all (e.g. for car radios and amateur radios) / 12 or 24 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)

• Power out
• 2 W (unknown quality)

• Material
• Metal case

• from Radiomuseum.org
• Model: Receiver BC-603- [part of SCR-508, SCR-528] - MILITARY U.S. different makers

• Shape
• Boatanchor (heavy military or commercial set >20 kg).

• Dimensions (WHD)
• 170 x 295 x 320 mm / 6.7 x 11.6 x 12.6 inch

• Notes

• Range 20 - 27,9 MHz, ten channel presets, NBFM (Amstrong license). Needs dynamotor DM-34-(*) (12 volts) or DM-36-A (24 volts). Similar to receiver BC-683 (27 - 38.9 MHz). Some slightly different variants with different Suffixes.

  Basic component of WWII tank radio sets SCR-508 and SCR-528, matches transmitter BC-604. Also made under license in France.
  
  The BC-603 was used for instance for the system SCR-508 from 1942 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 20 - 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.

  The power supply is from a dynamotor which can supply 12 or 24V DC. 

  A 110-220 V power supply operating with a 6X4 or EZ90 tube can be connected to the dynamotor socket.
  Also a stabilized power supply from main 110-220 V working with two BY127 or P400 rectifiers can be connected to the dynamotor socket.

• Net weight (2.2 lb = 1 kg)
• 16 kg / 35 lb 3.9 oz (35.242 lb)

• Source of data
• -- Schematic

• Mentioned in
• The Surplus Handbook - Receivers and Transmitters (pag. 29-30)

• Literature/Schematics (1)
• -- Schematic (“Radio Rivista” official organ of "ARI Amateur Radio Assoc." of Italy, number 3, March 1974.)

• Literature/Schematics (2)
• CQ Elettronica, Italy CD editor December 1969

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