GB609857A - Improvements in variable permeability tuning devices - Google Patents

Improvements in variable permeability tuning devices

Info

Publication number
GB609857A
GB609857A GB8345/46A GB834546A GB609857A GB 609857 A GB609857 A GB 609857A GB 8345/46 A GB8345/46 A GB 8345/46A GB 834546 A GB834546 A GB 834546A GB 609857 A GB609857 A GB 609857A
Authority
GB
United Kingdom
Prior art keywords
windings
winding
parallel
series
potential end
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB8345/46A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marconis Wireless Telegraph Co Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB609857A publication Critical patent/GB609857A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
    • H01F21/06—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by movement of core or part of core relative to the windings as a whole

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

609,857. Inductances. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. March 18, 1946, No. 8345. Convention date, March 17, 1945. [Class 38 (ii)] [Also in Group XL (c)] A variable permeability tuning device comprises at least two coaxial inductance windings, an axially movable magnetic core and a switch for connecting the windings in series aiding or parallel aiding relation for operation in different frequency bands. A pair of bi-filar windings 2, 3 are wound in the same direction on an insulating former. The windings are preferably single layer solenoid windings having equal spacing between turns and the same length and diameter. The high potential end of winding 2 is connected to the control grid of a valve 6, which may be the radio frequency amplifier or the converter of a radio receiver. Windings 2 and 3 may be connected in series or parallel by band change switch 8. A trimmer condenser 18 is connected between the high potential end of winding 2 and the earthed low potential end of winding 3. The circuit is tuned by adjusting a ferromagnetic core 17, and the distributed capacity of the windings is such that the range covered with the windings in series does not substantially overlap the range covered with the windings in parallel.
GB8345/46A 1945-03-17 1946-03-18 Improvements in variable permeability tuning devices Expired GB609857A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US609857XA 1960-11-04 1960-11-04

Publications (1)

Publication Number Publication Date
GB609857A true GB609857A (en) 1948-10-07

Family

ID=22032945

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8345/46A Expired GB609857A (en) 1945-03-17 1946-03-18 Improvements in variable permeability tuning devices

Country Status (2)

Country Link
BE (1) BE609857A (en)
GB (1) GB609857A (en)

Also Published As

Publication number Publication date
BE609857A (en) 1962-05-03

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