Diamond - Sunflower plug-in Coil Sunflower

Diamond (Brand), The Diamond Wireless Equipment Co. Ltd.; London

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  • Year
  • 1924/1925 ?
  • Category
  • Radio part (not a module) 
  • Radiomuseum.org ID
  • 220138

 Technical Specifications

  • Wave bands
  • Wave Bands given in the notes.
  • Power type and voltage
  • No Power needed
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Various materials
  • from Radiomuseum.org
  • Model: Diamond - Sunflower plug-in Coil Sunflower - Diamond Brand, The Diamond
  • Dimensions (WHD)
  • 90 x 112 x 22 mm / 3.5 x 4.4 x 0.9 inch
  • Notes

  • Pin-jack socket. The advert is boasting: "...the windings are so separated by air passages that self-capacity is practically nil"...
    Measurements taken of a No.70 coil gave the following results:
    an inductance of 380 µH and a self-capacity of ca 55 pF. That is far from nil, and even higher than the average for coils of similar size.
    Nothing dramatic, just the good old advertising exaggeration. Not much has changed in the meantime...

    Waveband Coverage

    Diamond - Sunflower coils were available to cover the range from 100 metres, No. 25 to 3520 metres, No. 250.

  • Net weight (2.2 lb = 1 kg)
  • 0.072 kg / 0 lb 2.5 oz (0.159 lb)
  • Mentioned in
  • Modern Wireless, 1924, June p.49, July p.177
  • Literature/Schematics (1)
  • -- Original prospect or advert (Modern Wireless, Sep 1924, p. 413.)
  • Author
  • Model page created by Rudolf Osterkamp. See "Data change" for further contributors.

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The model Diamond - Sunflower plug-in Coil is part of the collections of the following members.

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