GB491805A - Improvements in or relating to methods of modulating carrier waves and circuits therefor - Google Patents
Improvements in or relating to methods of modulating carrier waves and circuits thereforInfo
- Publication number
- GB491805A GB491805A GB6830/37A GB683037A GB491805A GB 491805 A GB491805 A GB 491805A GB 6830/37 A GB6830/37 A GB 6830/37A GB 683037 A GB683037 A GB 683037A GB 491805 A GB491805 A GB 491805A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grid
- output
- electrodes
- carrier frequency
- carrier
- 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
- 238000010079 rubber tapping Methods 0.000 abstract 2
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes
- H03C1/18—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid
- H03C1/24—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to different grid
Landscapes
- Amplitude Modulation (AREA)
Abstract
491,805. Valve modulating circuits. FERNSEH AKT.-GES. March 8, 1937, No. 6830. Convention date, March 6,1936. [Class 40 (v)] In a modulator comprising a multi-electrode valve, carrier frequency potentials are produced on two electrodes and combined in opposition in an output circuit; the distribution of current between the electrodes being controlled by modulation on a grid between them. The anode A and grid G3 of the hexode, Fig. 2, are maintained positive by the high tension source connected to the tapping on the output transformer D and the carrier is applied to the control. grid G1. The carrier frequency currents in the primary of D are in opposition and their relative magnitude is controlled by the potential on the grid G4 so that the carrier frequency output may be reduced to zero by adjustment of the primary tapping or suitable biassing of G4. The modulating potentials are applied by transformer C to grid G4. In modifications, Figs. 3, 4 (not shown), the control grid G1 has a fixed bias and the carrier is applied directly in push-pull or parallel to the output electrodes ; the modulated output being taken in parallel or push-pull. Specification 262,083, [Class 40 (v)], is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1936F0080837 DE696584C (en) | 1936-03-06 | 1936-03-06 | Modulation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB491805A true GB491805A (en) | 1938-09-08 |
Family
ID=6544317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6830/37A Expired GB491805A (en) | 1936-03-06 | 1937-03-08 | Improvements in or relating to methods of modulating carrier waves and circuits therefor |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2163939A (en) |
| DE (1) | DE696584C (en) |
| FR (1) | FR817323A (en) |
| GB (1) | GB491805A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE752409C (en) * | 1937-12-21 | 1953-09-28 | Aeg | Circuit arrangement for suppressing the residual carrier caused by differences in the characteristic curve in push-pull tube modulators |
| DE757568C (en) * | 1939-01-01 | 1953-06-01 | Fernseh Gmbh | Tube arrangement for optional phase-correct or anti-phase reinforcement in television transmission devices |
| DE756792C (en) * | 1939-03-30 | 1953-01-26 | Fernseh Gmbh | Modulation method |
| NL81954C (en) * | 1946-04-10 | |||
| US2498526A (en) * | 1948-02-19 | 1950-02-21 | Rca Corp | Balanced modulation |
| NL198471A (en) * | 1954-06-29 | |||
| USRE24747E (en) * | 1955-05-02 | 1959-12-15 | Adler etau | |
| US2952736A (en) * | 1956-12-28 | 1960-09-13 | Rca Corp | Color television receiver demodulator and color balance circuits |
| US2997666A (en) * | 1959-04-15 | 1961-08-22 | Combustion Eng | Pulse amplitude to pulse duration converter |
-
1936
- 1936-03-06 DE DE1936F0080837 patent/DE696584C/en not_active Expired
-
1937
- 1937-02-03 FR FR817323D patent/FR817323A/en not_active Expired
- 1937-02-24 US US127513A patent/US2163939A/en not_active Expired - Lifetime
- 1937-03-08 GB GB6830/37A patent/GB491805A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE696584C (en) | 1940-09-25 |
| FR817323A (en) | 1937-09-01 |
| US2163939A (en) | 1939-06-27 |
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