Jove Receiving Transformer List No. 8834

Bunnell & Co., J.H.; Kings Park, NY

  • Year
  • 1919
  • Category
  • Radio module pre 1926 (not a part, not a key)
  • Radiomuseum.org ID
  • 196992

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

 Technical Specifications

  • Main principle
  • Tuner pre 1926 (not a wave trap)
  • Wave bands
  • Broadcast (MW) and Long Wave.
  • Power type and voltage
  • No Power needed
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Jove Receiving Transformer List No. 8834 - Bunnell & Co., J.H.; Kings
  • Shape
  • Tablemodel, with any shape - general.
  • Dimensions (WHD)
  • 360 x 130 x 140 mm / 14.2 x 5.1 x 5.5 inch
  • Notes
  • Nov. 1st 1919 Wireless Catalog for the Bunnell Company. The Jove Receiving Transformer for wave lengths up to 1,800 meters. 15 primary and 6 secondary taps.
  • Net weight (2.2 lb = 1 kg)
  • 6 lb (6 lb 0 oz) / 2.724 kg
  • Price in first year of sale
  • 14.00 $
  • Source of data
  • - - Manufacturers Literature
  • Literature/Schematics (1)
  • Bunnell Catalog No. 41 Nov. 1st, 1919
  • Author
  • Model page created by Alan Larsen. See "Data change" for further contributors.

 Collections | Museums | Literature

Collections

The model Jove Receiving Transformer is part of the collections of the following members.

 Forum

Forum contributions about this model: Bunnell & Co., J.H.;: Jove Receiving Transformer List No. 8834

Threads: 2 | Posts: 4

This paper describes test bench measurements of a crystal radio using this loose coupler

Attachments

Serioja Tatu, 06.Nov.24

Weitere Posts (1) zu diesem Thema.

Details of Serioja Tatu's receiver setup:

  1. This is an loose coupler manufactured by the well known J.H. Bunnell & Co. pre 1919. The tuner comes from the Harold Greenwood wireless radio collection. Its paper Greenwood tag is undamaged and affixed to the underside of the base.
  2. The crystal receiver that use this coupler (see schematic) tunes from 600 KHz to 1410 KHz with the indoor 10 ft. antenna and a ground connection. With the moving coil completely outside and higher impedance static coil (left side) and moving coil switch at 0 position (right) the receiver tunes at 600 KHz. When moving sliding coil inside, the tuned frequency increase without touching any switch or variable capacitor. The tuned frequency increase also when the switch of the static coil is moved toward right, decreasing his inductance.
  3. A vintage “de Forest Crosley” 2 tube amplifier (2 x 201A tubes) is used on the test bench, in addition to high impedance (2000 ohms) headphones, as seen in related photos. 
  4. Measurements with a Rohde & Schwarz SM300 signal generator with the corresponding adapter for the impedance of a long wire antenna, shows a sensibility of around – 35 dBm over the AM band, with a decent signal to noise ratio in the headphones when the “de Forest Crosley” 2 tube amplifier is used. 

Jerry Elarton, 12.Oct.24

Weitere Posts (3) zu diesem Thema.