• Country
• Great Britain (UK)

• Manufacturer / Brand
• Diamond Wireless, London

• Year
• 1928 ??

• Category
• Radio module post 1925 (not a part, not a key)

• Radiomuseum.org ID
• 220138

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Various materials

• from Radiomuseum.org
• Model: Plug-in coil Sunflower - Diamond Wireless, London

• 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...

• 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

• Author
• Model page created by Rudolf Osterkamp. See "Data change" for further contributors.

• Other Models

• Here you find 2 models, 1 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Diamond Wireless, London