GB613855A - Frequency modulated oscillator - Google Patents
Frequency modulated oscillatorInfo
- Publication number
- GB613855A GB613855A GB210546A GB210546A GB613855A GB 613855 A GB613855 A GB 613855A GB 210546 A GB210546 A GB 210546A GB 210546 A GB210546 A GB 210546A GB 613855 A GB613855 A GB 613855A
- Authority
- GB
- United Kingdom
- Prior art keywords
- condenser
- oscillator
- reactance
- follow
- thermionic
- 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
- 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
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
613,855. Frequency modulation; testing tuned circuits ; BRITISH THOMSONHOUSTON CO., Ltd., and KING, A. H. Jan. 22, 1946, No. 2105. [Class 40 (v)] In a frequency modulated oscillator having a thermionic reactance in shunt with its tuned circuit, the magnitude of the thermionic reactance is controlled by a resistance and condenser in series, the condenser being connected between the cathode and grid of the thermionic reactance and varied with a main tuning condenser. As shown, a thermionic reactance V2 is connected across the tuned circuit 4, 3 of an oscillator V1. A modulating voltage, which may be derived from a oscilloscope time-base circuit, is applied to the control grid of the reactance 15. The quadrature voltage for the grid of V2 is taken from the junction of resistance 10, and condenser 11, which is ganged with tuning condenser 4 of the oscillator VI. Condenser 11 is arranged to follow <3>/2 power law with respect to condenser 4. This ensures that the frequency sweep of the oscillator remains constant at different mean frequencies. The condensers 4, 11 may follow the same law, and a shunt trimming condenser 14 and padding condenser 13 be provided to make the effective capacity in the tuned circuit follow the rerequired law. The oscillator may be used to test tuned circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB210546A GB613855A (en) | 1946-01-22 | 1946-01-22 | Frequency modulated oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB210546A GB613855A (en) | 1946-01-22 | 1946-01-22 | Frequency modulated oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB613855A true GB613855A (en) | 1948-12-03 |
Family
ID=9733709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB210546A Expired GB613855A (en) | 1946-01-22 | 1946-01-22 | Frequency modulated oscillator |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB613855A (en) |
-
1946
- 1946-01-22 GB GB210546A patent/GB613855A/en not_active Expired
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