Six-Valve Shortwave Superheterodyne

Eddystone (Brand), Stratton and Co., Ltd., Eddystone Radio Ltd.; Birmingham

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  • Année
  • 1935 ?
  • Catégorie
  • Boîte de construction (composants et manuel) ou instructions
  • Radiomuseum.org ID
  • 355308

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 Spécifications techniques

  • No. de tubes
  • 6
  • No. de transistors
  • Semi-conducteurs
  • WX6
  • Principe général
  • Super hétérodyne (en général)
  • Gammes d'ondes
  • OC uniquement
  • Tension / type courant
  • Alimentation Courant Alternatif (CA)
  • Haut-parleur
  • HP dynamique à électro-aimant (électrodynamique)
  • Matière
  • Boitier métallique, lampes visibles
  • De Radiomuseum.org
  • Modèle: Six-Valve Shortwave Superheterodyne - Eddystone Brand, Stratton and
  • Forme
  • Chassis (pour intégration dans meuble)
  • Remarques

  • Six-Valve Shortwave Superheterodyne Kitset: Detailed Breakdown

    This kitset offers a complete shortwave radio experience, featuring:

    • Six Valves: This includes a full-wave rectifier for power conversion and a metal rectifier for automatic volume control (AVC).
    • Superheterodyne Design: It employs the superheterodyne principle, converting received signals to a fixed intermediate frequency (IF) for easier amplification and filtering.

    Signal Processing Stages:

    • First Detector: A screened-grid valve functions as an anode-bend rectifier, converting the received radio signal to an IF signal.
    • Local Oscillator: A separate triode valve generates the necessary oscillation signal for frequency mixing in the superheterodyne process.
    • Intermediate Frequency (IF) Amplifier: A variable-mu-screened pentode amplifies the IF signal at a fixed frequency of 450 kHz.
    • Second Detector: A screened high-frequency pentode with power grid rectification demodulates the IF signal to recover the audio information. This stage uses resistance coupling to connect to the output valve.
    • Output Stage: A directly heated pentode valve provides power amplification for the audio signal.

    Tuning and Controls:

    • Ganged Tuning: A ganged capacitor simplifies tuning by adjusting both the antenna circuit and oscillator simultaneously across four-wave ranges. A small trimmer capacitor fine-tunes the antenna circuit for optimal reception.
    • Four Wave Ranges: The switchable wave ranges cover a broad spectrum from 13 to 68 metres, approximately 21.4 to 4.4 MHz.
    • Automatic Volume Control (AVC): An AVC circuit with a dedicated metal rectifier (WX6) automatically adjusts the gain to maintain consistent audio volume even with varying signal strengths. A switch allows you to bypass the AVC and use a manual volume control for more precise adjustments.

    Construction Details:

    • Robust Chassis: The receiver, including the power supply, is built on a sturdy cast aluminum alloy chassis, providing a reliable foundation for assembly.
    • Effective Shielding: The coil unit utilizes a one-piece metal casting to shield the oscillator circuit, minimizing unwanted signal interactions (interlocking).
    • High-Quality Transformer: The mains transformer is designed for exceptional performance, ensuring good voltage regulation without overheating.

    Further Information:

    This kitset was comprehensively described in Eddystone Shortwave Manual No. 2 (1935), on pages 34-38.

  • Littérature
  • - - Manufacturers Literature (Eddystone Shortwave Manual No. 2 1935, Pages 34 - 38)
  • Auteur
  • Modèle crée par Gary Cowans. Voir les propositions de modification pour les contributeurs supplémentaires.

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