Improved SW Booster No. 231

Postal Radio, New York

  • Année
  • 1935
  • Catégorie
  • Amplificateur HF
  • Radiomuseum.org ID
  • 354578

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

 Spécifications techniques

  • No. de tubes
  • 3
  • Principe général
  • Amplification haute fréquence (seulement)
  • Gammes d'ondes
  • OC uniquement
  • Tension / type courant
  • Alimentation Courant Alternatif (CA) / 110 Volt
  • Haut-parleur
  • - - Pas de sortie basse fréquence
  • Matière
  • Boitier métallique
  • De Radiomuseum.org
  • Modèle: Improved SW Booster No. 231 - Postal Radio, New York
  • Forme
  • Modèle de table générique
  • Remarques
  • The Postal Improved SW Booster No. 231 has the following features:

    • Two-Stage SW TRF Preselector-Booster for TRF or Superheterodyne SW radios.
    • Boosts the tuned SW signal, which is then connected to the SW radio antenna input.
    • SW frequency is tuned with the booster's TRF 2-gang tuning capacitor and tuning coils.  SW Radio should be tuned to the same SW band and frequency as the booster.
    • Front panel SW TRF tuning coils are removable to select the SW bands (assumed the same as the earlier model):
      • "A"   14-29 meters (10.3-21.4 MHz)
      • "B"   29-55 meters (5.4-10.3 MHz)
      • "C"   55-90 meters (3.3-5.4 MHz)
      • "D"   90-200 meters (1.5-3.3 MHz)
    • Powered by 110V AC.
    • Power switch: On / Off.
    • Volume control.
    • Rear terminals: Antenna In +, Antenna In -, GND.
    • Shielded cable pigtail to the SW radio: Antenna Out, GND.
    • Antenna Select switch: Booster On (Antenna In + to booster, booster output to Antenna OutBypass (Antenna In + direct to Antenna Out).

    This model was an improvement over the earlier model for the following reasons:

    • AC power now applied through a power transformer, which isolates AC Line and Neutral/GND from the chassis/GND, eliminating a possible AC shorting issue as described in the earlier model page.
    • Higher B+ voltage to about 200V (from 90V) for greater gain and selectivity.
    • Air vents added to the cabinet sides.

    The earlier model was the Postal Short-Wave Booster.

  • Schémathèque (1)
  • -- Original prospect or advert (Short Wave Craft, December 1934, page 476 schematic and description, 491 ad.)
  • Schémathèque (2)
  • Radio Craft (January 1935, page 410 schematic and description.)
  • Auteur
  • Modèle crée par Jerry Elarton. Voir les propositions de modification pour les contributeurs supplémentaires.

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