• Year
  • 1933 ?
  • Category
  • Television Receiver (TV) or Monitor
  • Radiomuseum.org ID
  • 354703

 Technical Specifications

  • Wave bands
  • - without
  • Details
  • Mechanical Television
  • Power type and voltage
  • Line (AC, UC or DC not known)
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Televisor - Postal Radio, New York
  • Notes
  • The Postal Televisor was a mechanical televison without the BC/SW radio.

    Information is very limited, but most likely consists of:

    • Mechanical TV mechanisms, including:
      • Perforated spinning disk; Nipkow disc, or similar.
      • Motor with synchronization control.
      • Neon lamp with variable-intensity drive circuitry.
      • Viewing window.
    • Requires an external radio with the audio output signal connected to the neon lamp drive circuitry.

    The typical operation would be to tune to a local TV broadcast channel, adjust the synchronization motor control, and adjust the lamp intensity control until an image is visible. Note that the early transmissions would have a very limited bandwidth of 9-10 kHz, resulting in very poor image motion capability; therefore, they are best for mostly still images only. Another limitation would be the practical mechanical spin rate of the perforated spinning disk and the resulting slow image sweep rate. There may have also been an experimental audio broadcast on another frequency that was intended to add audio to the TV broadcast.

    The price listed was for the wired model; the kit was 11.95 USD; and an extra neon lamp was 1.50 USD. 

    A similar model is the Pioneer Disk Scanner T-3.

     

  • Price in first year of sale
  • 12.50 USD
  • Literature/Schematics (1)
  • Radio World (August 12, 1933, pages 2, 14.)
  • Author
  • Model page created by Jerry Elarton. See "Data change" for further contributors.

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