GB357479A - Improvements in or relating to arrangements for producing modulated high frequency oscillations - Google Patents
Improvements in or relating to arrangements for producing modulated high frequency oscillationsInfo
- Publication number
- GB357479A GB357479A GB12197/31A GB1219731A GB357479A GB 357479 A GB357479 A GB 357479A GB 12197/31 A GB12197/31 A GB 12197/31A GB 1219731 A GB1219731 A GB 1219731A GB 357479 A GB357479 A GB 357479A
- Authority
- GB
- United Kingdom
- Prior art keywords
- modulation
- carrier
- phase
- couplings
- april
- 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
- H03C1/52—Modulators in which carrier or one sideband is wholly or partially suppressed
- H03C1/60—Modulators in which carrier or one sideband is wholly or partially suppressed with one sideband wholly or partially suppressed
Landscapes
- Amplitude Modulation (AREA)
Abstract
357,479. Wireless transmitting systems. TELEFUNKEN GES. FUR DRAHTLOSE TELEGRAPHIE, 12, Hallesches Ufer, Berlin. April 24, 1931, No. 12197. Convention date, April 28, 1930. [Class 40 (v).] In a modulation system for high-frequency signalling, a single sideband with or without the addition of the carrier wave, is produced by combining the outputs of an amplitude-modulation stage and a phase-modulation stage. As shown in the Figure, amplitude modulation is effected in a valve 3, to the grid circuit of which the modulating voltage is applied through a transformer T1, and the carrier voltage through a coupling T2, from a source O. Phase modulation is effected by applying the carrier-wave in phase quadrature to the grids of back-to-back valves 1, 2, and by applying the modulating voltage in push-pull relation to the same grids. The output is combined by the couplings K1, K2, and one or the other sideband is obtained according to the sense of the couplings K1, K2. The Specification includes a mathematical explanation of the system and shows that when the modulating voltages applied at T, T1 are in phase quadrature, one of the sidebands appearing at K1, K2 is accompanied by an unmodulated carrier.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE538922T | 1930-04-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB357479A true GB357479A (en) | 1931-09-24 |
Family
ID=34122369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB12197/31A Expired GB357479A (en) | 1930-04-29 | 1931-04-24 | Improvements in or relating to arrangements for producing modulated high frequency oscillations |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2083747A (en) |
| DE (1) | DE538922C (en) |
| FR (1) | FR709524A (en) |
| GB (1) | GB357479A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2635226A (en) * | 1950-01-20 | 1953-04-14 | Collins Radio Co | Phase modulation system and apparatus |
| US3267392A (en) * | 1960-04-18 | 1966-08-16 | Hughes Aircraft Co | Balanced phase modulator |
-
1930
- 1930-04-29 DE DE1930538922D patent/DE538922C/en not_active Expired
-
1931
- 1931-01-16 FR FR709524D patent/FR709524A/en not_active Expired
- 1931-04-24 GB GB12197/31A patent/GB357479A/en not_active Expired
- 1931-04-25 US US532971A patent/US2083747A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE538922C (en) | 1931-11-19 |
| US2083747A (en) | 1937-06-15 |
| FR709524A (en) | 1931-08-07 |
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