GB553884A - Improvements in variable thermionic impedances - Google Patents
Improvements in variable thermionic impedancesInfo
- Publication number
- GB553884A GB553884A GB273/42A GB27342A GB553884A GB 553884 A GB553884 A GB 553884A GB 273/42 A GB273/42 A GB 273/42A GB 27342 A GB27342 A GB 27342A GB 553884 A GB553884 A GB 553884A
- Authority
- GB
- United Kingdom
- Prior art keywords
- control
- varied
- impedance
- thermionic
- impedances
- 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
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- 230000001939 inductive effect Effects 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0153—Electrical filters; Controlling thereof
- H03H7/0161—Bandpass filters
-
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/16—Automatic control
- H03G5/24—Automatic control in frequency-selective amplifiers
- H03G5/26—Automatic control in frequency-selective amplifiers having discharge tubes
Landscapes
- Selective Calling Equipment (AREA)
Abstract
553,884. Thermionic impedances. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Jan. 7, 1942, No. 273. Convention date, Jan. 7, 1941. [Class 40 (v)] The effective value of an inductive, capacitive or resistive impedance is varied with variation in the transconductance of an electron discharge device. The impedance is connected in parallel with the grid cathode path and in series with an unbypassed resistance in the cathode lead. The arrangement may be used to vary the common coupling impedance in a band-pass network to control band-width or for the remote control of tuning. Fig. 4 shows the application to a filter network in which coupling condenser 24 is varied by control of the anode voltage of the valve 30. In a modification both the screen and anode voltages are varied to control the transconductance, Fig. 2 (not shown). Fig. 6 shows an arrangement in which the signal and local oscillator circuits 40, 52, respectively, of a superheterodyne receiver are controlled by capacitive reactances 71, 72 which may be controlled from a remote point by potentiometer 101.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US553884XA | 1941-01-07 | 1941-01-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB553884A true GB553884A (en) | 1943-06-09 |
Family
ID=21997478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB273/42A Expired GB553884A (en) | 1941-01-07 | 1942-01-07 | Improvements in variable thermionic impedances |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB553884A (en) |
-
1942
- 1942-01-07 GB GB273/42A patent/GB553884A/en not_active Expired
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