• Year
  • 1907–1912
  • Category
  • Radio module pre 1926 (not a part, not a key)
  • Radiomuseum.org ID
  • 219879

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Main principle
  • Tuner pre 1926 (not a wave trap)
  • Tuned circuits
  • 3 AM circuit(s)
  • Wave bands
  • Wave Bands given in the notes.
  • Power type and voltage
  • No Power needed
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Multiple Tuner - Marconi's Wireless Telegraph
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Dimensions (WHD)
  • 19 x 5.25 x 8 inch / 483 x 133 x 203 mm
  • Notes
  • Patented by Charles S.Franklin the Multiple Tuner was capable to tune over 4 wave bands:
    80 - 150 m
    150 - 1600 m
    1600 - 2000 m
    2000 - 2600m.
    widely used together with the Magnetic Detector on board ships. Two output terminals are even labeled "Magnetic".
    Coarse tuning by the geared range switches at the front panel. Separate fine tuning of the three circuits by the variable condensers on the top panel.

  • Literature/Schematics (1)
  • Museum für Kommunikation Frankfurt
  • Author
  • Model page created by Heiko zur Mühlen. See "Data change" for further contributors.

 Collections | Museums | Literature

Collections

The model Multiple Tuner is part of the collections of the following members.

Museums

The model Multiple Tuner can be seen in the following museums.

Literature

The model Multiple Tuner is documented in the following literature.

 Forum

Forum contributions about this model: Marconi's Wireless: Multiple Tuner

Threads: 1 | Posts: 1

Um Funksignale verschiedener Sender (-frequenzen) trennen zu können, war eine Abstimmung auf der Empfangsseite nötig. Die alten Marconi-Empfänger waren nicht abstimmbar. Diesen Nachteil beseitigte der Braun-Empfänger, der erste Erfolge schon um 1904 zeitigte.

Marconi brachte 1907 den von Charles S.Franklin patentierten trennscharfen Multiple Tuner heraus, der praktisch über den gesamten verwendeten Frequenzbereich arbeitete. Er fand verbreitet Anwendung auf Schiffen in Verbindung mit Maggie, dem Magnetic Detector von Marconi.

Lit.:
-
Eichhorn, Drahtlose Telegraphie; 1904
- Hill, RadioRadio

Konrad Birkner † 12.08.2014, 07.Jun.12

Weitere Posts (1) zu diesem Thema.