GB686323A - Improvements in tuning device for high frequency electrical energy - Google Patents
Improvements in tuning device for high frequency electrical energyInfo
- Publication number
- GB686323A GB686323A GB7038/50A GB703850A GB686323A GB 686323 A GB686323 A GB 686323A GB 7038/50 A GB7038/50 A GB 7038/50A GB 703850 A GB703850 A GB 703850A GB 686323 A GB686323 A GB 686323A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lines
- unit
- circuited
- valve
- stage
- 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
- H01F21/005—Inductances without magnetic core
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)
- Amplifiers (AREA)
Abstract
686,323. Radio receiving apparatus. DUMONT LABORATORIES, Inc., A. B. March 21, 1950 [April 23, 1949], No. 7038/50. Class 40 (v). [Also in Group XL (b)] In a television receiver having a tuning element A, B, or C, in each stage, which consists of two coupled short-circuited lines 21a 25a, 21b, 25b, or 21c, 25c, the elements are operated together by a ganged switch arrangement 45. The latter comprises sliding contact members 44, 51, 91, 60, 56, 74 and 68. In the position shown in Fig. 11 the bottom movable members connect the two lines of a unit in parallel with their connection to their particular valve stage. The upper contact members connect each tuning element with its successive element. On shifting switch assembly 45 one step the position of Fig. 12 is produced, which results in the two lines of a unit being connected in series and the fixed inductances 102, 103, 104, 105, 106, and 107 being brought into circuit. In the third switch position, as shown in Fig. 13, one line in each unit is short-circuited and put out of action. The circuit shown consists of a highfrequency amplifier valve 43, a mixer valve 54, and a local oscillator 65.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US686323XA | 1949-04-23 | 1949-04-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB686323A true GB686323A (en) | 1953-01-21 |
Family
ID=22083768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7038/50A Expired GB686323A (en) | 1949-04-23 | 1950-03-21 | Improvements in tuning device for high frequency electrical energy |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB686323A (en) |
-
1950
- 1950-03-21 GB GB7038/50A patent/GB686323A/en not_active Expired
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