GB489571A - Improvements in automatic tuning apparatus for wireless receivers - Google Patents
Improvements in automatic tuning apparatus for wireless receiversInfo
- Publication number
- GB489571A GB489571A GB272537A GB272537A GB489571A GB 489571 A GB489571 A GB 489571A GB 272537 A GB272537 A GB 272537A GB 272537 A GB272537 A GB 272537A GB 489571 A GB489571 A GB 489571A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- circuit
- oscillator
- detector
- control
- 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
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
Abstract
489,571. Wireless receiving circuits. ROBINSON, J. Jan. 29, 1937, No. 2725. [Class 40 (v)] An automatic frequency control system for a heterodyne receiver comprises a highly selective circuit 28 tuned to the true intermediate frequency, the output of which is applied, together with the incoming signals from 20, 33, 34, to a mixing valve 29 to produce a beat frequency which corresponds to the oscillator frequency required to give the true I.F. This beat frequency is applied as a control frequency to the oscillator circuit 22, 23, over coupling 35 and pulls the oscillator frequency into tune with the control frequency. The signal frequency may be derived from the anode circuit of the first detector 21 and the second detector 26 may be coupled directly to the stage 28 which is a balanced circuit comprising a crystal gate 31 and condenser 32.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB272537A GB489571A (en) | 1937-01-29 | 1937-01-29 | Improvements in automatic tuning apparatus for wireless receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB272537A GB489571A (en) | 1937-01-29 | 1937-01-29 | Improvements in automatic tuning apparatus for wireless receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB489571A true GB489571A (en) | 1938-07-29 |
Family
ID=9744697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB272537A Expired GB489571A (en) | 1937-01-29 | 1937-01-29 | Improvements in automatic tuning apparatus for wireless receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB489571A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1184874B (en) * | 1955-12-30 | 1965-01-07 | Beckman Instruments Inc | Tunable circuit arrangement with the transmission behavior of a band pass, extremely small bandwidth and high edge steepness |
-
1937
- 1937-01-29 GB GB272537A patent/GB489571A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1184874B (en) * | 1955-12-30 | 1965-01-07 | Beckman Instruments Inc | Tunable circuit arrangement with the transmission behavior of a band pass, extremely small bandwidth and high edge steepness |
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