GB526464A - Improvements in or relating to tuning devices for radio receiving apparatus - Google Patents
Improvements in or relating to tuning devices for radio receiving apparatusInfo
- Publication number
- GB526464A GB526464A GB850639A GB850639A GB526464A GB 526464 A GB526464 A GB 526464A GB 850639 A GB850639 A GB 850639A GB 850639 A GB850639 A GB 850639A GB 526464 A GB526464 A GB 526464A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- core
- cores
- former
- shorter
- 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
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/28—Continuous tuning of more than one resonant circuit simultaneously, the tuning frequencies of the circuits having a substantially constant difference throughout the tuning range
Landscapes
- Coils Or Transformers For Communication (AREA)
Abstract
526,464. Variable inductances. FERRANTI, Ltd., SEARBY, N. H., and NEILL, V. A. March 17, 1939, No. 8506. [Class 38 (ii)] One pair of a set of variable inductances for tuning a superheterodyne receiver manually or by means of push buttons comprises a paper former 5 carrying an aerial coil 3 and, on an extra former 6, an oscillator coil 1. Corresponding dust iron cores 4, 2 are mounted on a threaded rod 7 and are spaced apart by a compressed paper tube 11 and a rubber tube 12 which allows a certain amount of compression by means of nuts 13 for adjusting the separation of the cores. Pre-adjustment of the positions of the cores relative to the coils is effected by turning rod 7 in a screwed bush 8 mounted on the chassis of the receiver. Coil 1 has a lower ratio of highest to lowest frequency than coil 3, and to facilitate ganging at all frequencies coil 1 is made of larger diameter than coil 3 while core 2 is made shorter than coil 4. Alternatively coil 1 is shorter than coil 3 and the permeability of core 2 is less than that of core 4. Specification 520,552 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB850639A GB526464A (en) | 1939-03-17 | 1939-03-17 | Improvements in or relating to tuning devices for radio receiving apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB850639A GB526464A (en) | 1939-03-17 | 1939-03-17 | Improvements in or relating to tuning devices for radio receiving apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB526464A true GB526464A (en) | 1940-09-18 |
Family
ID=9853751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB850639A Expired GB526464A (en) | 1939-03-17 | 1939-03-17 | Improvements in or relating to tuning devices for radio receiving apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB526464A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2491347A (en) * | 1942-12-08 | 1949-12-13 | Victor S Johnson Jr | Precision radio tuner |
| US2555511A (en) * | 1946-04-09 | 1951-06-05 | Rca Corp | Variable permeability tuning system |
-
1939
- 1939-03-17 GB GB850639A patent/GB526464A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2491347A (en) * | 1942-12-08 | 1949-12-13 | Victor S Johnson Jr | Precision radio tuner |
| US2555511A (en) * | 1946-04-09 | 1951-06-05 | Rca Corp | Variable permeability tuning system |
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