Heterodyne Local Oscillator 357

MIM, Marconi International Marine; Chelmsford Essex

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  • Year
  • 1930 ??
  • Category
  • Commercial Receiver (may include amateur bands)
  • Radiomuseum.org ID
  • 257258

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

 Technical Specifications

  • Number of Tubes
  • 1
  • Valves / Tubes
  • Wave bands
  • Wave Bands given in the notes.
  • Power type and voltage
  • Storage and/or dry batteries / 2 or 4 or 6 & 72 Volt
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Heterodyne Local Oscillator 357 - MIM, Marconi International
  • Shape
  • Boatanchor (heavy military or commercial set >20 kg).
  • Notes

  • The heterodyne type 357 has been specially designed for use with the receiver Type 352. It covers a wave range from 200 to 22,000 meters in 5 wavebands and is for use on CW signals only.

    The heterodyne uses a simple oscillator circuit which is coupled to the receiver by means of a coupling capacity, contained within the device. A large HT choke and a decoupling condenser prevent feedback to the receiver via the battery or battery leads.

    The heterodyne comes with a calibration chart that gives instructions about wave range switch and tuning condenser position for each desired wave length.

  • Mentioned in
  • - - Manufacturers Literature

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