PRC-9 RT-175A / PRC-9

MILITARY U.S. (different makers for same model)

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  • Year
  • 1951–1962 ?
  • Category
  • Military Transceiver (TRX)
  • Radiomuseum.org ID
  • 176286

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

 Technical Specifications

  • Number of Tubes
  • 14
  • Main principle
  • Transceiver; ZF/IF 4300 kHz; 1 AF stage(s)
  • Tuned circuits
  • 9 FM circuit(s)
  • Wave bands
  • Wave Bands given in the notes.
  • Power type and voltage
  • Dry Batteries / 1,5 & 6 & 67,5 & 135 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: PRC-9 RT-175A / PRC-9 - MILITARY U.S. different makers
  • Shape
  • Portable set > 8 inch (also usable without mains)
  • Dimensions (WHD)
  • 265 x 77 x 470 mm / 10.4 x 3 x 18.5 inch
  • Notes
  • The RT-175A FM-transceiver is a main component of the PRC-9 radio-equipment. Only in literature we can find the name PRC-9A, but on the equipment the -A suffix is never present.
    Frequency range is 27-39 MHz, FM (F3), 1 W.
    VFO-tuning and a crystal calibrator stage giving 4,3 MHz checkpoints. In the receiver-part we find 2 RF-stages, 4 IF stages, a discriminator FM-detector with 2 germanium diodes, a squelch-circuit and a pulse sweep generator to control the transmit frequency.
    At the top we find all controls and connectors for the headset and 3 antennas: long whip AT271, short whip AT-272, and a ca. 50 ohm BNC-connector.
    The set was designed for field use with a 3,65 kg multi-voltage battery BA-279, or for vehicular use with a 24 volts PSU and audio-amplifier AM-598.
    All tubes, exept the noval 5A6, are of Special Quality subminiature B5A type. The factory aligned complete IF circuits, including the mini-tubes, are housed in sealed metal cans with B7G-pins, as well as the discriminator-circuit and the pulse sweep generator.
    Similar, but with different frequency-ranges are RT-174A / PRC-8 20-28 MHz, and RT-176A / PRC-10 38-55 MHz.
    A variant with different circuitry and 16 tubes, but a look-alike, is the RT-175 / PRC-9. Another variant is the 1 channel, 30-42 MHz, crystal controlled RT-339/PRC28.
  • Net weight (2.2 lb = 1 kg)
  • 8.420 kg / 18 lb 8.7 oz (18.546 lb)
  • Source of data
  • -- Original-techn. papers.
  • Mentioned in
  • -- Original-techn. papers.
  • Literature/Schematics (1)
  • -- Original-techn. papers. (TM11-612. TM11-4065.)
  • Author
  • Model page created by Jan Terranea. See "Data change" for further contributors.

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