GB515106A - Improvements in or relating to modulator carrier wave transmitters - Google Patents
Improvements in or relating to modulator carrier wave transmittersInfo
- Publication number
- GB515106A GB515106A GB15395/38A GB1539538A GB515106A GB 515106 A GB515106 A GB 515106A GB 15395/38 A GB15395/38 A GB 15395/38A GB 1539538 A GB1539538 A GB 1539538A GB 515106 A GB515106 A GB 515106A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- grid
- ground
- source
- wave energy
- 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
Abstract
515,106. Modulating systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. May 24, 1938, No. 15395. Convention date, June 26, 1937. [Class 40 (v)] Amplitude or combined phase and amplitude modulation of wave energy from a source H.F. with partial or complete suppression of the carrier is obtained by means of a balanced circuit L2, Z1, Z2. The valve V1 which feeds the output circuit L3 has its grid circuit connected between the junction point of impedances Z1 and Z2 and ground. The centre point of inductance L2 is connected to ground through a choke X and a source of anode current B3 for the modulator valves V2, V3, which balance the two sides of circuit L2, Z1, Z2, with respect to ground when no modulation is applied, no voltage then appearing across impedance Z3 in the grid circuit of V1. Modulating potentials from source AF are applied in opposite phase to the grids of valves V2, V3, and unbalance the circuit L2, Z1, Z2, with the result that modulation products with the carrier frequency reduced or suppressed are impressed on the grid of tube V1. If the similar impedances Z1, Z2 are replaced by dissimilar impedances a phase shift of the wave energy supplied by each branch to the grid of V1 with respect to the wave energy from H.F. occurs and phase as well as amplitude modulation is produced.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US150499A US2169859A (en) | 1937-06-26 | 1937-06-26 | Carrier reduced modulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB515106A true GB515106A (en) | 1939-11-27 |
Family
ID=22534822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB15395/38A Expired GB515106A (en) | 1937-06-26 | 1938-05-24 | Improvements in or relating to modulator carrier wave transmitters |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2169859A (en) |
| GB (1) | GB515106A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2573274A (en) * | 1943-08-02 | 1951-10-30 | Rca Corp | Frequency modulation circuit |
| US2488927A (en) * | 1945-03-10 | 1949-11-22 | Rca Corp | Variable bridge transducer and its combination with a radio receiver |
| US2551802A (en) * | 1948-01-05 | 1951-05-08 | Rca Corp | Phase modulator |
-
1937
- 1937-06-26 US US150499A patent/US2169859A/en not_active Expired - Lifetime
-
1938
- 1938-05-24 GB GB15395/38A patent/GB515106A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2169859A (en) | 1939-08-15 |
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