HF Receiver CRH-11 1C68300

Amalgamated Wireless (Australasia) Ltd. (AWA); Sydney

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  • Year
  • 1975–2000
  • Category
  • Military Receiver
  • Radiomuseum.org ID
  • 321954

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

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • Superhet with RF-stage; ZF/IF 1749.5 kHz
  • Wave bands
  • Short Wave (SW only)
  • Power type and voltage
  • Alternating Current supply (AC) / 115V or 220-260 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: HF Receiver CRH-11 1C68300 - Amalgamated Wireless
  • Shape
  • Rack
  • Dimensions (WHD)
  • 444 x 177 x 516 mm / 17.5 x 7 x 20.3 inch
  • Notes

  • The CRH-11 HF synthesised communications receiver designed from 1972 and released in 1975 was developed to meet the latest military requirements for computer aided tactical command and control systems. The receiver provides reliable high-grade reception of ISB/SSB/DATA signals for HF high speed data links in military systems.  Electrical and environmental characteristics fulfil the requirements for single and dual diversity reception applications for military tactical and fixed station roles,

    including specialised usage in ships, submarines and other mobile or transportable communications systems.

    To suit general usage additional modes were provided for the reception of AM/CW/FSK/FAX signals.

    The receiver front end incorporated an automatic tuned filter of 3% 6 dB bandwidth. This filter provides a continuous improvement in receiver crossmodulation, intermodulation, blocking and desensitisation as the separation of receiver tuned frequency and large unwanted signals. This preselection results in high channel availability.

    The radio assembly is comprised of three plug-in modules in rack mounted case.

    • 1C68304 Synthesiser for frequency control via 7 thumbwheel switches, BFO and local/ remote control selection
    • 1C68324 Signal processor for control of RF gain, AGC delay, audio monitoring, signal strength meter and Mode selection
    • 1H68344 Power Supply  

    In 1972, Jim Spence BSc(Elec. Eng.)  was appointed Project Engineer, managing eight engineers with the task of designing a new 2 to 30 MHz HF receiver for the Royal Australian Navy (RAN) that met some parts of an equivalent US Military Specification (MIL-SPEC) that no US supplier had yet met at that time. The task took three years and involved multiple prototypes and many months of radio performance, testing under a broad range of environmental conditions. Jim also made many visits to the USA to discuss various aspects of the MIL-SPEC with US experts who considered it to be just a design target unlike the RAN who considered it a mandatory requirement. The receiver known as the CRH-11 went into production in 1975 and remined in service into the early 2000’s.

    Two examples of the CRH-11 are on display in the radio room of HMAS Gladstone at the Gladstone Maritime museum.

  • Net weight (2.2 lb = 1 kg)
  • 32 kg / 70 lb 7.8 oz (70.485 lb)
  • Mentioned in
  • - - Manufacturers Literature (AWA Deference Communications, Cat 318/E)
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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