GB503443A - Modulating arrangements for high frequency signalling systems - Google Patents
Modulating arrangements for high frequency signalling systemsInfo
- Publication number
- GB503443A GB503443A GB1198/38A GB119838A GB503443A GB 503443 A GB503443 A GB 503443A GB 1198/38 A GB1198/38 A GB 1198/38A GB 119838 A GB119838 A GB 119838A GB 503443 A GB503443 A GB 503443A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- transformer
- modulation
- grid
- high frequency
- 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
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/62—Modulators in which amplitude of carrier component in output is dependent upon strength of modulating signal, e.g. no carrier output when no modulating signal is present
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
- H03F1/06—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers to raise the efficiency of amplifying modulated radio frequency waves; to raise the efficiency of amplifiers acting also as modulators
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Amplitude Modulation (AREA)
Abstract
503,443. Modulation systems. LORENZ AKT.-GES., C. Jan. 13, 1938, No. 1198. Convention date, Jan. 13, 1937. [Class 40 (v)] In order to improve the efficiency of u high frequency modulation system a floating carrier modulator is combined with a power amplifier, the .anode voltage of which is varied in accordance with the modulation amplitude. The grid of the modulating stage 2 has applied to it modulating potentials from microphone 5 over amplifier 4 and transformer 3. The modulator grid circuit includes a resistance 6, across which potentials derived from the rectifier 7 are applied to provide the floating carrier control. The final power amplifier 9 is preceded by an amplifier 8 and a low frequency transformer 10 inserted in its connection to the anode voltage source A. The primary of transformer 10 forms the output circuit of the push-pull class B amplifier 12, the grids of which are controlled by the modulation from amplifier 11. To improve the quality and prevent retroaction a low frequency counter feed-back may be provided at the amplifier 9 by deriving a voltage from the output of amplifier 12 by means of winding 13 and conveying it to the grid of valve 9 over transformer 14. The amplifier 12 may be operated without standing current as distortion may be allowed to arise to some extent since it is compensated by the counter feed-back.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE205375X | 1937-01-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB503443A true GB503443A (en) | 1939-04-06 |
Family
ID=5786884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1198/38A Expired GB503443A (en) | 1937-01-13 | 1938-01-13 | Modulating arrangements for high frequency signalling systems |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2189897A (en) |
| BE (1) | BE425727A (en) |
| CH (1) | CH205375A (en) |
| FR (1) | FR831994A (en) |
| GB (1) | GB503443A (en) |
| NL (1) | NL54832C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2605397A (en) * | 1950-02-25 | 1952-07-29 | Westinghouse Electric Corp | Radio receiver for single side band signals |
| US2969508A (en) * | 1957-06-28 | 1961-01-24 | Mark I Jacob | Grid modulation system for simultaneous am and fm transmissions |
| US4737192A (en) * | 1983-10-17 | 1988-04-12 | Manville Service Corporation | Refractory binder, method for making same, and product produced thereby |
-
0
- BE BE425727D patent/BE425727A/xx unknown
- NL NL54832D patent/NL54832C/xx active
-
1938
- 1938-01-10 CH CH205375D patent/CH205375A/en unknown
- 1938-01-12 FR FR831994D patent/FR831994A/en not_active Expired
- 1938-01-12 US US184646A patent/US2189897A/en not_active Expired - Lifetime
- 1938-01-13 GB GB1198/38A patent/GB503443A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR831994A (en) | 1938-09-16 |
| US2189897A (en) | 1940-02-13 |
| NL54832C (en) | |
| CH205375A (en) | 1939-06-15 |
| BE425727A (en) |
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