page_title: SCR-54
section_title: Specifications
hierarchical_section_title: SCR-54 / Specifications
caption_attribution_description: English: Schematic of the US Signal Corps SCR-54 radio receiver
context_page_description: The SCR-54 was a tunable, portable crystal radio receiver used by the U. S. Army during World War I for fire control in conjunction with airplanes.
context_section_description: Its primary (antenna) and secondary circuits were both tunable by variable capacitance and inductance.  A crystal detector (Type DC-1) and telephone circuit were connected to the secondary circuit. It could receive wavelengths from 250–550 meters (545 to 1200 kHz). The receiver included two crystal (galena) detectors, one sealed in glass, and the other not, which were attached on the surface of the receiver. A buzzer circuit, powered by a BA-4 battery, was mounted in the box cover and used to adjust the crystal.
  The set was compact and mounted in a wooden box, type BC-14. The lid of the box held the buzzer circuit, detectors, a screwdriver, two P-11 telephone headsets, spare parts, extra crystals, and an operating manual, “Radio Pamphlet No. 3”.
  The receiver was intended to be used with antenna type A-2 or A-2-B.
caption: Schematic Wiring Diagram of the Type SCR-54 Set
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