GB571580A - Frequency modulation detector - Google Patents
Frequency modulation detectorInfo
- Publication number
- GB571580A GB571580A GB21000/43A GB2100043A GB571580A GB 571580 A GB571580 A GB 571580A GB 21000/43 A GB21000/43 A GB 21000/43A GB 2100043 A GB2100043 A GB 2100043A GB 571580 A GB571580 A GB 571580A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- circuit
- tuned
- dec
- valve
- 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
- H03D11/00—Super-regenerative demodulator circuits
- H03D11/06—Super-regenerative demodulator circuits for angle-modulated oscillations
Abstract
571,580. Frequency modulation. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Dec. 15, 1943, No. 21000. Convention date, Dec. 15, 1942. [Class 40 (v)] A demodulator and limiter circuit for use in the reception of frequency-modulated waves comprises one or more frequency-discriminating networks associated with one or more superregenerative valve circuits. As shown, the incoming wave which may be reduced in frequency by heterodyning is applied by the tuned circuit 1 to a pair of tuned circuits 3, 4, one of which is tuned above and the other below the mean frequency of the applied wave. Each circuit 3, 4 is in back-coupling connection to a valve 5, 6, the oscillation being rendered intermittent by suitable proportioning of the grid leaks and condensers. The anodes are connected to opposite ends of a push-pull output transformer 10, or to a centre-tapped resistance, which feeds the demodulated signal to amplifiers &c. The valves 5, 6 are arranged to operate as rectifiers ; and the limiting action of the circuit eliminates amplitude-modulation effects as described in U.S.A. Specification 2,273.090.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US469089A US2373616A (en) | 1942-12-15 | 1942-12-15 | Frequency modulation detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB571580A true GB571580A (en) | 1945-08-30 |
Family
ID=23862371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB21000/43A Expired GB571580A (en) | 1942-12-15 | 1943-12-15 | Frequency modulation detector |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2373616A (en) |
| GB (1) | GB571580A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2539204A (en) * | 1946-09-12 | 1951-01-23 | Westinghouse Electric Corp | Frequency discriminator |
| US2577782A (en) * | 1947-06-07 | 1951-12-11 | Hazeltine Research Inc | Superregenerative frequencymodulation receiver |
| US2679583A (en) * | 1948-08-23 | 1954-05-25 | Bendix Aviat Corp | Superregenerative detector of frequency modulated signals |
| US2873367A (en) * | 1953-11-19 | 1959-02-10 | Rca Corp | Angle modulation detector |
-
1942
- 1942-12-15 US US469089A patent/US2373616A/en not_active Expired - Lifetime
-
1943
- 1943-12-15 GB GB21000/43A patent/GB571580A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2373616A (en) | 1945-04-10 |
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