• Country
• United States of America (USA)

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

• Year
• 1949

• Category
• Military Transceiver (TRX)

• Radiomuseum.org ID
• 176545

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

• Number of Tubes
• 27

• Valves / Tubes
• 6AK5 1R5 1R5 1R5 1R5 3A5 3A5 3A5 3Q4 3Q4 3Q4 3A4 1AE4 3B4 3B4 2E24 1L4 1L4 1L4 1S5 1U4 1U4 1U4 1A3 1A3

• Main principle
• Transceiver; ZF/IF 4450-4550 / 1400 kHz; 2 AF stage(s)

• Tuned circuits
• 10 FM circuit(s)

• Wave bands
• Short Wave (SW only)

• Power type and voltage
• Powered by external power supply or a main unit.

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Receiver-Transmitter RT-67/GRC - MILITARY U.S. different makers

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

• Dimensions (WHD)
• 286 x 230 x 330 mm / 11.3 x 9.1 x 13 inch

• Notes

• RT-67/GRC is a robust FM radio-set, designed for vehicular use, applied in several communication set-ups: stand alone as VRC-9, or in larger systems GRC-5, GRC-6 and VRQ-2, powered by PSU PP-109/GRC with 12 volts battery or PP-112/GRC with 24 volts battery. It could also be used in the field with auxiliary-kit MX-898/GRC, including generator G-8/GRC and (not neccessary) a battery-box CY-590/GRC.
  Frequency range 27-39 MHz, transmitter output 2 watt low, or 16 watt high, FM(F3), voice and MCW.
  In the double conversion receiver part we find a RF stage, a first oscillator and first mixer to a band of 4450 to 5550 kHz.
  The left big tuning knob at the front serves a crystal-oscillator and a harmonics generator by switching to the desired MHz. There are 12 crystals to choose. The right big tuning knob serves a VFO to tune the desired signal within 1 MHz. After 2 variable IF stages, a second oscillator stage and second mixer stage bring the signal to a second IF of 1400 kHz, followed by 2 IF limiter stages, and a FM-discrimator with 2 valve-diodes 1A3.
  The transmitter frequency is controlled by a special discriminator that compares the transmitting-frequency to the receiver-frequency.
  The 2E24 transmitter-PA has a special quick-ready filament, and is only heated on transmit mode.

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

• Source of data
• -- Original-techn. papers.

• Literature/Schematics (1)
• TM11-289 1953 TDv 5820/006-13 1959

• Author
• Model page created by Jan Terranea. See "Data change" for further contributors.

• Other Models

• Here you find 399 models, 351 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)