GB648129A - Improvements in and relating to frequency modulation detectors - Google Patents
Improvements in and relating to frequency modulation detectorsInfo
- Publication number
- GB648129A GB648129A GB30918/48A GB3091848A GB648129A GB 648129 A GB648129 A GB 648129A GB 30918/48 A GB30918/48 A GB 30918/48A GB 3091848 A GB3091848 A GB 3091848A GB 648129 A GB648129 A GB 648129A
- Authority
- GB
- United Kingdom
- Prior art keywords
- receiver
- tune
- frequency modulation
- nov
- reduce
- 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
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
- H03D3/06—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators
- H03D3/12—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of discharge tubes having more than two electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
648,129. Frequency modulation. BRITISH THOMSON-HOUSTON CO., Ltd. Nov. 29, 1948, No. 30918. Convention date, Nov. 29, 1947. [Class 40 (v)] In order to reduce the response of a F.M. receiver when off-tune, the rectifiers 9, 10 of a phasing or other discriminator of normal type are provided with control grids 20, 21, each of which is connected to its own cathode by an audio byepass condenser 23, 25, and to the opposite cathode by a resistor 22, 24. When the receiver is slightly mis-tuned, there is a D.C. voltage between the two cathodes, which is transferred to the opposite grids, in such sense as to reduce the current flowing through the more active rectifier. In this way, the off-tune output of the receiver is reduced below its normal in-tune output, and correct tuning may be obtained by listening for maximum output.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US648129XA | 1947-11-29 | 1947-11-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB648129A true GB648129A (en) | 1950-12-28 |
Family
ID=22058418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30918/48A Expired GB648129A (en) | 1947-11-29 | 1948-11-29 | Improvements in and relating to frequency modulation detectors |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB648129A (en) |
-
1948
- 1948-11-29 GB GB30918/48A patent/GB648129A/en not_active Expired
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