RMD900/RMD1500/RMD1800 Series of digital radio links.

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

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  • Year
  • 1986
  • Category
  • Commercial Transmitter & Receiver (TRX not Amateur)
  • Radiomuseum.org ID
  • 321995

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
  • Wave bands
  • Wave Bands given in the notes.
  • Power type and voltage
  • Direct Current supply (DC) / 24V - 50 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: RMD900/RMD1500/RMD1800 Series of digital radio links. - Amalgamated Wireless
  • Shape
  • Rack
  • Notes

  • The RMD Series of digital radios were designed specifically to meet the challenges Imposed by the harsh Australian conditions, Including extremes of temperature as well as distance. Telecom Australia was one of the first customers, placing orders in excess of $5 million.

    The radios were designed to provide communications into areas very difficult to service because of remoteness and harsh conditions. They coped well with heat and cold, having an operational range over temperatures from 10° to 60°C. Also, they consume very little power, enabling them to be solar powered and to be located in simple shelters which results in large savings In Infrastructure costs.

    The equipment provided 900 MHz, 1500 MHz and 1800MHz, 2 to 8 Mbit/s communication links in rural telephone networks, on pipeline projects and major utilities such as power and rail authorities. Repeaters were available that could extend the path lengths over virtually any distance.

    The AWA Defence & Transmission Division won the 1986 Engineering Product Excellence Award from the Institution of Engineers Australia for this product.

    The basic system comprised a transmitter, diplexer, and receiver at each end.The system could be installed in an unprotected mode or equipped with warm or hot standby. Hitless switching is available and enables the system to be configured with either space or frequency diversity. The equipment used line code HDB3 (High-Density Bipolar Order 3) for transmission over G.703 E1 networks.In all configurations a Technicians communication telephone (Order Wire) was proved in a sub-baseband channel and monitored with a speaker in the RX unit.

    System Equipment Details

     MODEL  BAND  CAPACITY
     902  900 MHz  2 MBit/s
     904  900 MHz  4 MBit/s
     1502  1500 MHz  2 MBit/s
     1504  1500 MHz  4 MBit/s
     1804  1800 MHz  4 MBit/s
     1808  1800 MHz  8 MBit/s

    Protection switching is provided by the PSD unit designated by capacity.

     MODEL  CAPACITY
     PSD2  2 MBit/s
     PSD4  4 MBit/s
     PSD8  8 MBit/s

    An RF Repeater is available for each frequency band.

     MODEL  BAND
     RMR900  900 MHz
     RMR1500  1500 MHz
     RMR1800  1800 MHz

    Equipment Details

    The nominal RF output power of the RMD TX was +37 dBm. When power usage was of concern, i.e. solar sites, the power could be adjusted in the range of +30 to +37 dBm.

    The TX and RX were both fully agile over the operating band with the frequency being set by screwdriver adjustable decade switches.Monitoring of RF level, BER, fault conditions were available on a display on each unit.

  • Mentioned in
  • - - Manufacturers Literature (AWA RMD Series DRS, 000 188-W37)
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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