GB493102A - Radio-frequency selector apparatus - Google Patents
Radio-frequency selector apparatusInfo
- Publication number
- GB493102A GB493102A GB903637A GB903637A GB493102A GB 493102 A GB493102 A GB 493102A GB 903637 A GB903637 A GB 903637A GB 903637 A GB903637 A GB 903637A GB 493102 A GB493102 A GB 493102A
- Authority
- GB
- United Kingdom
- Prior art keywords
- unit
- drum
- coil
- screws
- radio
- 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
- H01F27/00—Details of transformers or inductances, in general
- H01F27/004—Arrangements for interchanging inductances, transformers or coils thereof
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transmitters (AREA)
Abstract
493,102. Mechanical switches without quick action. DENT, H., and OSMOND, C. E. March 30, 1937, No. 9036. [Class 38 (v)] [Also in Groups XL and XXXV] A selector unit, particularly for wave-band switching in an all-wave receiver, comprises a plurality of drum-like units mounted on a single shaft, rotation of which effects the circuit changes. The drums are divided into radial compartments by members 14, Fig. 2, which, together with the peripheral plates 13, constitute one unit segment of the drum, removable as a unit by removing two screws 17b, Fig. 1. Each segment carries a complete tuning coil 18, padder condenser 19c and trimmer condenser 19, the coil inductance and trimmer capacity being adjustable externally by screws 22, 19a. The coil is mounted on a base portion 21 formed in the plate 13, and has an adjustable iron-dust core. Rotation of the whole assembly effects connection between the contacts 24 on the drum and fixed flexible contacts 5. Each complete unit may also incorporate a switch 26e, h, j which may insert filter circuits in the aerial circuit and also carries a contact for switching from radio to gramophone reproduction, the high frequency circuits then being disconnected. A spring-ball click locating device 10, 11, 12 is provided. Specification 454,188, [Group XL], is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB903637A GB493102A (en) | 1937-03-30 | 1937-03-30 | Radio-frequency selector apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB903637A GB493102A (en) | 1937-03-30 | 1937-03-30 | Radio-frequency selector apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB493102A true GB493102A (en) | 1938-09-30 |
Family
ID=9864153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB903637A Expired GB493102A (en) | 1937-03-30 | 1937-03-30 | Radio-frequency selector apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB493102A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3300665A (en) * | 1962-08-10 | 1967-01-24 | Int Standard Electric Corp | Rotatable piezoelectric tuning device |
| US6302524B1 (en) * | 1998-10-13 | 2001-10-16 | Xerox Corporation | Liquid level control in an acoustic droplet emitter |
-
1937
- 1937-03-30 GB GB903637A patent/GB493102A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3300665A (en) * | 1962-08-10 | 1967-01-24 | Int Standard Electric Corp | Rotatable piezoelectric tuning device |
| US6302524B1 (en) * | 1998-10-13 | 2001-10-16 | Xerox Corporation | Liquid level control in an acoustic droplet emitter |
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