GB556852A - A improved frequency-modulated oscillation generator - Google Patents
A improved frequency-modulated oscillation generatorInfo
- Publication number
- GB556852A GB556852A GB13799/42A GB1379942A GB556852A GB 556852 A GB556852 A GB 556852A GB 13799/42 A GB13799/42 A GB 13799/42A GB 1379942 A GB1379942 A GB 1379942A GB 556852 A GB556852 A GB 556852A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valves
- grids
- anodes
- condenser
- modulating voltage
- 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
- 230000010355 oscillation Effects 0.000 title 1
- 239000013078 crystal Substances 0.000 abstract 3
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/10—Angle modulation by means of variable impedance
- H03C3/12—Angle modulation by means of variable impedance by means of a variable reactive element
- H03C3/14—Angle modulation by means of variable impedance by means of a variable reactive element simulated by circuit comprising active element with at least three electrodes, e.g. reactance-tube circuit
- H03C3/16—Angle modulation by means of variable impedance by means of a variable reactive element simulated by circuit comprising active element with at least three electrodes, e.g. reactance-tube circuit in which the active element simultaneously serves as the active element of an oscillator
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Particle Accelerators (AREA)
Abstract
556,852. Frequency modulation. MARCONI'S WIRELESS TELEGRAPH CO. Ltd. Oct. 1, 1942, No. 13799. Convention date, Oct. 2, 1941. [Class 40 (v)] A frequency modulator comprises two backcoupled valves operating with a common piezoelectric crystal and tank circuit, but with reactances of different sign in the respective feed-back circuits so that the valves tend to operate at different frequencies ; and the modulating voltage is applied differentially to control elements in the valves. As shown, the crystal X is connected between the anodes and the control grids of the valves V1, V2, the grid connection of one including a condenser C and of the other an inductance L. Resistances R1, R2 connect the respective grids to the earthed cathodes, and a common tank circuit Cl, L1 is connected between the anodes and HT+. Modulating voltage is applied through a transformer T in push-pull relation to the positive outer grids of the valves, so that the transmitted frequency varies continuously as each valve in turn predominates in its effect. The modulating voltage may be applied to the inner control grids, Fig. 3 (not shown). In a modification, the crystal X is connected between the cathodes and the junction of the condenser C and inductance L, which junction is connected to the anodes by a variable condenser, Fig. 2 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US413292A US2318979A (en) | 1941-10-02 | 1941-10-02 | Frequency modulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB556852A true GB556852A (en) | 1943-10-25 |
Family
ID=23636673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13799/42A Expired GB556852A (en) | 1941-10-02 | 1942-10-01 | A improved frequency-modulated oscillation generator |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2318979A (en) |
| GB (1) | GB556852A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2435259A (en) * | 1940-06-14 | 1948-02-03 | Western Union Telegraph Co | Frequency control apparatus |
| NL132648B (en) * | 1946-06-19 |
-
1941
- 1941-10-02 US US413292A patent/US2318979A/en not_active Expired - Lifetime
-
1942
- 1942-10-01 GB GB13799/42A patent/GB556852A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2318979A (en) | 1943-05-11 |
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