GB959438A - Permeability tuner - Google Patents
Permeability tunerInfo
- 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
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)
- Coils Or Transformers For Communication (AREA)
- Magnetic Ceramics (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.
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)
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)
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 |
-
1960
- 1960-01-28 GB GB3068/60A patent/GB959438A/en not_active Expired
-
1961
- 1961-01-24 US US84745A patent/US3151305A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US3151305A (en) | 1964-09-29 |
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