100 Watt Broadcast Band Transmitter

Colmovox (Brand), Colville-Moore Wireless Supplies Ltd.; Sydney NSW

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  • Year
  • 1936
  • Category
  • Commercial Transmitter (TX not Transceiver)
  • Radiomuseum.org ID
  • 327875

 Technical Specifications

  • Number of Tubes
  • 8
  • Main principle
  • Transmitter
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Alternating Current supply (AC)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: 100 Watt Broadcast Band Transmitter - Colmovox Brand, Colville-Moore
  • Shape
  • Boatanchor (heavy military or commercial set >20 kg).
  • Notes

  • TECHNICAL DESCRIPTION OF 100 WATT BROADCAST TRANSMITTER:

    The transmitter is a 4-stage crystal transmitter, built and designed by Colville Wireless Equipment Co., and installed in December 1936.

    Crystal oscillator is an E424 valve, crystal A.T. cut, 1st Buffer QB05/15, 2nd Buffer C2/75, and the final amplifier is a TB2/250. Modulated by a pair of MC2/200's in push-pull, sub modulators a pair of 250's in push pull.

    Studio equipment consists of velocity microphones and crystal pick-ups. Aerial system is a vertical radiator 150 feet high, gives the station a remarkable field strength (approx. 60 millivolts per metre).

    A cathode ray oscilloscope is installed at the station for checking purposes.

    The input power is taken from the town 3 phase power supply and uses 3 phase full wave rectification for plate and filament supply.

    Extracted from The Broadcasting Business Yearbook 1937, Page 130.

  • Mentioned in
  • -- Original prospect or advert (The Broadcasting Business Yearbook 1937, Page 130.)
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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