Arcadia Magnascopic Dial

Ferranti, GB

Daten
Forum
Bilder
Sammlungen

  • Jahr
  • 1936/1937
  • Kategorie
  • Rundfunkempfänger (Radio - oder Tuner nach WW2)
  • Radiomuseum.org ID
  • 78665

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 Technische Daten

  • Anzahl Röhren
  • 5
  • Hauptprinzip
  • Superhet allgemein; ZF/IF 125 kHz
  • Wellenbereiche
  • Langwelle, Mittelwelle und Kurzwelle.
  • Betriebsart / Volt
  • Wechselstromspeisung / 200-250 Volt
  • Lautsprecher
  • Dynamischer LS, mit Erregerspule (elektrodynamisch)
  • Material
  • Gerät mit Holzgehäuse
  • von Radiomuseum.org
  • Modell: Arcadia [Magnascopic Dial] - Ferranti, GB
  • Form
  • Tischgerät, Hochformat (höher als quadratisch, schlicht, keine Kathedrale).
  • Abmessungen (BHT)
  • 16 x 18 x 9.25 inch / 406 x 457 x 235 mm
  • Bemerkung

  • Ferranti “Arcadia” Receiver with Magnascopic Dial

    The Ferranti Arcadia was a high-performance, five-valve superheterodyne receiver representing a significant advancement over the earlier model. It was designed with a focus on refined performance and user-friendly operation, incorporating several features considered advanced for its time.

    Technical Features:

    • Circuit Design: The circuit incorporated a heptode frequency changer and a variable-mu pentode Intermediate Frequency (IF) amplifier operating at a frequency of 125 kc/s. A double-diode triode served as the second detector, AVC rectifier, and first audio amplifier.
    • Variable Selectivity and Tone Control: A unique design allowed for variable selectivity by adjusting the coupling in the IF transformer. This control could reduce interference, particularly on distant stations. The set automatically returned to a high-selectivity setting when the tuning dial was moved.
    • Inter-station Noise Suppression: An integrated noise suppression circuit worked by switching the IF amplifier's AVC supply to the undelayed signal rectifier, effectively quieting the receiver between stations.
    • Magnascopic Dial: For precise tuning, especially on the shortwave band, the receiver featured a "Magnascopic" optical device. This magnified a portion of the 180-degree translucent tuning scale and projected it onto a ground glass screen, providing an effective scale length of over six feet and allowing for accurate, backlash-free tuning.
    • Audio and Loudspeaker: The moving-coil loudspeaker was modified with a free-suspension cone to enhance bass response, resulting in a full and smooth low-end. While the high-note response was adequate, it was intentionally limited to avoid accentuating local interference noises.
    • Aerial Circuit: The aerial tuning circuit was a well-designed band-pass filter that included an image rejector to minimize unwanted signals. It used mixed coupling for medium and long waves and inductive coupling for the shortwave range.

    A similar chassis is fitted into the 1936/7 Arcadia console radio and Arcadiagram radiogram.

  • Originalpreis
  • 15.75 GB £

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