GB556992A - Improvements in frequency modulation detection - Google Patents
Improvements in frequency modulation detectionInfo
- Publication number
- GB556992A GB556992A GB10693/42A GB1069342A GB556992A GB 556992 A GB556992 A GB 556992A GB 10693/42 A GB10693/42 A GB 10693/42A GB 1069342 A GB1069342 A GB 1069342A GB 556992 A GB556992 A GB 556992A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grid
- frequency
- input
- modulation
- variations
- 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
- 238000001514 detection method Methods 0.000 title 1
- 230000001550 time effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/30—Demodulation of angle-, frequency- or phase- modulated oscillations by means of transit-time tubes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Transmitters (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
556,992. Frequency modulation. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. July 30, 1942, No. 10693. Convention date, July 31, 1941. [Class 40 (v)] A frequency modulation detector comprises a valve with two control grids, the incoming wave being applied to one grid and the other being connected through a modulation-frequency impedance to the cathode ; voltages at modulation frequency arise on the second grid and are amplified across a load impedance in the anode circuit. The input FM wave is applied to the middle grid 11 of a five-grid valve, and the first grid 13 is connected to a fixed negative-voltage point 44 through a resistance 22. Variations of input frequency cause proportional variations of current to the inner grid, provided that the input frequency is high enough to give rise to transit time effects. The voltage variations on the inner grid 13 give a detected signal across the anode impedance 27. Bias voltages for the electrodes are supplied from a potentiometer 41 across a supply source, and from a resistance 20 in the cathode lead. A grid leak and condenser may be connected in the input lead, and brought into action by opening a switch, to give an amplitude-limiting action.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US404819A US2341484A (en) | 1941-07-31 | 1941-07-31 | Frequency modulation signal detector system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB556992A true GB556992A (en) | 1943-10-29 |
Family
ID=23601183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB10693/42A Expired GB556992A (en) | 1941-07-31 | 1942-07-30 | Improvements in frequency modulation detection |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2341484A (en) |
| GB (1) | GB556992A (en) |
-
1941
- 1941-07-31 US US404819A patent/US2341484A/en not_active Expired - Lifetime
-
1942
- 1942-07-30 GB GB10693/42A patent/GB556992A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2341484A (en) | 1944-02-08 |
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