GB609857A - Improvements in variable permeability tuning devices - Google Patents
Improvements in variable permeability tuning devicesInfo
- 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
Links
- 230000035699 permeability Effects 0.000 title abstract 2
- 238000004804 winding Methods 0.000 abstract 12
- 230000005294 ferromagnetic effect Effects 0.000 abstract 1
- 230000005291 magnetic effect Effects 0.000 abstract 1
- 239000002356 single layer Substances 0.000 abstract 1
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.
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) |
-
1946
- 1946-03-18 GB GB8345/46A patent/GB609857A/en not_active Expired
-
1961
- 1961-11-03 BE BE609857A patent/BE609857A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE609857A (en) | 1962-05-03 |
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