GB142474A - Improvements in the use of thermionic devices for producing frequency harmonics of electric oscillations - Google Patents
Improvements in the use of thermionic devices for producing frequency harmonics of electric oscillationsInfo
- Publication number
- GB142474A GB142474A GB11638/20A GB1163820A GB142474A GB 142474 A GB142474 A GB 142474A GB 11638/20 A GB11638/20 A GB 11638/20A GB 1163820 A GB1163820 A GB 1163820A GB 142474 A GB142474 A GB 142474A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- circuit
- impedance
- impressed
- harmonics
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B19/00—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source
- H03B19/06—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source by means of discharge device or semiconductor device with more than two electrodes
- H03B19/08—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source by means of discharge device or semiconductor device with more than two electrodes by means of a discharge device
- H03B19/10—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source by means of discharge device or semiconductor device with more than two electrodes by means of a discharge device using multiplication only
Landscapes
- Amplifiers (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
142,474. Western Electric Co., (Assignees of Vennes, H. J.). April 28, 1919, [Convention date]. Frequency, changing.-By inserting a high impedance, such as an ohmic resistance, in the plate circuit of a thermionic valve, the characteristic is changed from the type of curve shown at 1, Fig. 1. to that shown at 2, which gives greater distortion of an impressed sinusoidal wave when the valve is overloaded, with a consequent freer production of harmonics. The distortion is most marked in alternate half-cycles, and both odd and even harmonics are produced. The ohmic impedance also serves to stabilize the action of the valve. In the arrangement shown in Fig. 3, alternating current from a generator 6 is impressed through a transformer 8, 9 on an amplifying valve 10, the output circuit of which is connected to the grid circuit of a distorting-valve 20. The potential of the grid of this valve can be adjusted by a switch 20<1>. The circuit between the valves 10, 20 is bridged by a capacity-inductance loop 26, tuned to the base frequency of the generator 6, and having therefore a practically infinite impedance to this frequency but a small impedance to other frequencies, so that a substantially pure sinusoidal wave is impressed on the valve 20. The plate circuit of this valve includes an ohmic impedance 25 large compared with the internal impedance of the valve. The output circuit of the valve 20 is connected to the grid circuit of an amplifying valve 30, the connexion being bridged by an inductance 34 which has a higher impedance for the harmonics than for the base frequency, so that the former are impressed preponderatingly on the valve 30. The output circuit of this valve is connected to the work circuit through a transformer 36, 37. The filaments of the valves 10, 20, 30 are heated by a common battery 15, and their plate circuits are supplied by a common battery 17 through inductances 18, 24, 33. Blocking-condensers 19, 27, 35 prevent the passage of direct current in undesired paths.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US293055A US1485650A (en) | 1919-04-28 | 1919-04-28 | Generating harmonic currents |
Publications (1)
Publication Number | Publication Date |
---|---|
GB142474A true GB142474A (en) | 1920-12-30 |
Family
ID=23127456
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB11638/20A Expired GB142474A (en) | 1919-04-28 | 1920-04-27 | Improvements in the use of thermionic devices for producing frequency harmonics of electric oscillations |
Country Status (5)
Country | Link |
---|---|
US (1) | US1485650A (en) |
DE (1) | DE403655C (en) |
FR (1) | FR517687A (en) |
GB (1) | GB142474A (en) |
NL (1) | NL10035C (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2422878A (en) * | 1943-11-13 | 1947-06-24 | Rauland Corp | High level modulation system |
US3585411A (en) * | 1969-02-06 | 1971-06-15 | Motorola Inc | Frequency multiplying circuit |
-
0
- NL NL10035D patent/NL10035C/xx active
-
1919
- 1919-04-28 US US293055A patent/US1485650A/en not_active Expired - Lifetime
-
1920
- 1920-04-27 GB GB11638/20A patent/GB142474A/en not_active Expired
- 1920-05-23 DE DEB94167D patent/DE403655C/en not_active Expired
- 1920-06-23 FR FR517687A patent/FR517687A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL10035C (en) | |
US1485650A (en) | 1924-03-04 |
DE403655C (en) | 1924-10-02 |
FR517687A (en) | 1921-05-10 |
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