GB267617A - Improvements in radio receiving systems - Google Patents
Improvements in radio receiving systemsInfo
- Publication number
- GB267617A GB267617A GB3208125A GB3208125A GB267617A GB 267617 A GB267617 A GB 267617A GB 3208125 A GB3208125 A GB 3208125A GB 3208125 A GB3208125 A GB 3208125A GB 267617 A GB267617 A GB 267617A
- Authority
- GB
- United Kingdom
- Prior art keywords
- detector
- local oscillator
- grid
- intermediate frequency
- separately adjustable
- 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
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
- H03D7/08—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes the signals to be mixed being applied between the same two electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Superheterodyne Receivers (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
267,617. Standard Telephones & Cables, Ltd., (Western Electric Co., Inc.). Dec. 18, 1925. Thermionic heterodune receivers. -In a super-heterodyne receiver comprising a local oscillator 8, detector 6 for intermediate frequency, detector 21 for audiofrequency, and amplifiers 13, 14, 15, 23, the detector 6 and local oscillator 8 are coupled by a resistance 9, which serves also as grid leak for the detector 6 and is of such magnitude (e.g. 2 megohms) that tuning adjustment of either of the valves does not affect the tuning of the other. A condenser 25<11> connects the plate of one amplifier to the grid of the next amplifier but one, in order to check undesired oscillations. The input coupling includes separately adjustable coils 3, 4, and similarly the reaction coupling of the local oscillator 8 includes separately adjustable coils 10, 10<a>. The secondary windings of the transformers 16, 17, 18 are designed to cooperate with the inherent reactances of the circuits, including the internal valve-capacities, to select the intermediate frequency. The filaments are in series and the grids are tapped off the filament circuit at such points as will give the required grid bias.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3208125A GB267617A (en) | 1925-12-18 | 1925-12-18 | Improvements in radio receiving systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3208125A GB267617A (en) | 1925-12-18 | 1925-12-18 | Improvements in radio receiving systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB267617A true GB267617A (en) | 1927-03-18 |
Family
ID=10332913
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3208125A Expired GB267617A (en) | 1925-12-18 | 1925-12-18 | Improvements in radio receiving systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB267617A (en) |
-
1925
- 1925-12-18 GB GB3208125A patent/GB267617A/en not_active Expired
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