GB959438A - Permeability tuner - Google Patents

Permeability tuner

Info

Publication number
GB959438A
GB959438A GB3068/60A GB306860A GB959438A GB 959438 A GB959438 A GB 959438A GB 3068/60 A GB3068/60 A GB 3068/60A GB 306860 A GB306860 A GB 306860A GB 959438 A GB959438 A GB 959438A
Authority
GB
United Kingdom
Prior art keywords
core
coil
magnets
disc
jan
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
GB3068/60A
Inventor
Anthony William Simpson
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.)
Plessey Co Ltd
Original Assignee
Plessey 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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB3068/60A priority Critical patent/GB959438A/en
Priority to US84745A priority patent/US3151305A/en
Publication of GB959438A publication Critical patent/GB959438A/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
    • H01F21/08—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by varying the permeability of the core, e.g. by varying magnetic bias

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Ceramics (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

959,438. Inductors; magnetic compositions. PLESSEY CO. Ltd. Jan. 26, 1961 [Jan. 28, 1960], No. 3068/60. Headings H1H and HIT. A variable inductor for tunable circuits at high frequencies, e.g. television frequencies, comprises a coil 3 (Fig. 1), wound on a ferro- or ferri-magnetic core disc 2 situated in a magnetic field produced by two barium ferrite magnets 1 which are rotatable as shown by the arrows by means of a support 4 so as to vary the angle # between the coil axis and the saturating magnetic field which traverses the core 2. The effective permeability of the core in relation to the coil is stated to be 1+A Sin<SP>2</SP># where A is a constant. By selectively switching to vary the effective number of coil turns continuous tuning over a wide frequency band is possible. The magnets may be stationary and the coil and disc core may be rotated. The disc core may be horizontal or turned angularly with respect to the plane of rotation of the magnets. The composition of ferrites suitable for the core are specified including Zn, Ni, Mg, Mn and Ba.
GB3068/60A 1960-01-28 1960-01-28 Permeability tuner Expired GB959438A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB3068/60A GB959438A (en) 1960-01-28 1960-01-28 Permeability tuner
US84745A US3151305A (en) 1960-01-28 1961-01-24 Ferrite core inductor variable by altering direction of steady magnetic field

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3068/60A GB959438A (en) 1960-01-28 1960-01-28 Permeability tuner

Publications (1)

Publication Number Publication Date
GB959438A true GB959438A (en) 1964-06-03

Family

ID=9751396

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3068/60A Expired GB959438A (en) 1960-01-28 1960-01-28 Permeability tuner

Country Status (2)

Country Link
US (1) US3151305A (en)
GB (1) GB959438A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE668055A (en) * 1964-08-11
US3531747A (en) * 1969-03-07 1970-09-29 Melabs Tunable inductor

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2200263A (en) * 1933-10-23 1940-05-14 Kramolin Leon Ladislaus De Variable reactor
US2159754A (en) * 1935-03-04 1939-05-23 Aeg Tuning element for broadcast receiver sets
US2462423A (en) * 1944-07-15 1949-02-22 Wladimir J Polydoroff Ferromagnetic variable highfrequency inductor
US2581202A (en) * 1949-11-25 1952-01-01 Rca Corp Multistage variable-saturation tuning system and apparatus
US2860313A (en) * 1953-09-04 1958-11-11 Emerson Radio And Phonograph C Inductive tuning device
US2915637A (en) * 1953-11-30 1959-12-01 Int Electronic Res Corp Tuning system for toroid inductors
US2804617A (en) * 1954-06-02 1957-08-27 Wladimir J Polydoroff Antenna systems
US2882392A (en) * 1955-03-09 1959-04-14 Rca Corp Receiver tuned by inductors with tracking by initial positionment of coils on cores

Also Published As

Publication number Publication date
US3151305A (en) 1964-09-29

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