Neutrosonic Short Wave

Igranic Electric Co. Ltd.; Bedford

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  • Année
  • 1929
  • Catégorie
  • Radio - ou tuner d'après la guerre 1939-45
  • Radiomuseum.org ID
  • 182876

Cliquez sur la vignette du schéma pour le demander en tant que document gratuit.

 Spécifications techniques

  • No. de tubes
  • 6
  • Principe général
  • Super hétérodyne, circuits FI avec réaction; FI/IF 48 kHz; Tube à grille écran 1926-1935.
  • Gammes d'ondes
  • OC uniquement
  • Tension / type courant
  • Piles (rechargeables ou/et sèches)
  • Haut-parleur
  • - Ce modèle nécessite des HP externes
  • Matière
  • Boitier en bois
  • De Radiomuseum.org
  • Modèle: Neutrosonic Short Wave - Igranic Electric Co. Ltd.;
  • Forme
  • Modèle de table à panneau incliné
  • Remarques

  • The Superheterodyne Principle to Shortwave Reception was described in Wireless World in January 1930.

    The article discusses a new radio receiver from Igranic that uses the superheterodyne principle to receive shortwave signals effectively.

    Key points:

    • The superheterodyne principle is used to convert the incoming frequency to a lower value for easier amplification, particularly for frequencies below 100 metres.
    • Igranic's set demonstrates good control over these high frequencies, functioning down to 15 metres.
    • The set uses an aperiodic aerial circuit, avoiding the problems of harmonics and blind spots encountered with tuned circuits.
    • A screen-grid valve acts as a buffer between the aerial and oscillator, improving stability and allowing for longer aerials.
    • The set features a single tuning dial and a slow-motion control for reaction, simplifying operation.
    • Four sets of coils cover the entire range (12.5 to 70 metres) with overlapping bands for finer tuning.
    • The intermediate-frequency amplifier operates at a higher wavelength (6,250 metres) for easier tuning and to avoid confusion with other stations.
    • Reaction is introduced in the I.F. amplifier, providing stable control and minimizing adjustments.
    • The set delivers strong audio output, eliminating the need for headphones.
    • Overall, the Igranic radio receiver appears to be a well-designed and effective solution for shortwave reception, offering advantages in stability, ease of use, and performance.

    The price in oak, including valves, coils and royalties, but excluding batteries and loudspeaker, is £28.

  • Prix de mise sur le marché
  • 28.00 GBP
  • Auteur
  • Modèle crée par Roy Johnson. Voir les propositions de modification pour les contributeurs supplémentaires.

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