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Multiple Tuner

Multiple Tuner ; Marconi's Wireless (ID = 1356146) mod-pre26 Multiple Tuner ; Marconi's Wireless (ID = 1309066) mod-pre26
Multiple Tuner ; Marconi's Wireless (ID = 1248239) mod-pre26 Multiple Tuner ; Marconi's Wireless (ID = 1248240) mod-pre26
Multiple Tuner ; Marconi's Wireless (ID = 1248242) mod-pre26
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Multiple Tuner ; Marconi's Wireless (ID = 1356146) mod-pre26
Marconi's Wireless: Multiple Tuner [mod-pre26] ID = 1356146 933x540
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For model Multiple Tuner, Marconi's Wireless Telegraph Co. Ltd.
 
Country:  Great Britain (UK)
Manufacturer / Brand:  Marconi's Wireless Telegraph Co. Ltd.
Year: 1907–1912 Category: Radio module pre 1926 (not a part, not a key)
Main principle Tuner pre 1926 (not a wave trap)
Tuned circuits 3 AM circuit(s)
Wave bands Wave Bands given in the notes.
Details
Power type and voltage No Power needed
Loudspeaker - - No sound reproduction output.
Power out
from Radiomuseum.org Model: Multiple Tuner - Marconi's Wireless Telegraph
Material Wooden case
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.

Mentioned in Radio! Radio! (p.20)
Literature/Schematics (1) Museum für Kommunikation Frankfurt

Model page created by Heiko zur Mühlen. See "Data change" for further contributors.



All listed radios etc. from Marconi's Wireless Telegraph Co. Ltd.
Here you find 79 models, 78 with images and 10 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




 


Forum contributions about this model
Marconi's Wireless: Multiple Tuner
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marconi-wi: Multiple Tuner
Konrad Birkner † 12.08.2014
07.Jun.12
  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

 
Marconi's Wireless: Multiple Tuner
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