GB175635A - Improvements in thermionic wireless transmitters - Google Patents
Improvements in thermionic wireless transmittersInfo
- Publication number
- GB175635A GB175635A GB451022A GB451022A GB175635A GB 175635 A GB175635 A GB 175635A GB 451022 A GB451022 A GB 451022A GB 451022 A GB451022 A GB 451022A GB 175635 A GB175635 A GB 175635A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- anode
- space
- thermionic
- grid
- 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
- 230000001702 transmitter Effects 0.000 title abstract 2
- 230000000051 modifying Effects 0.000 abstract 2
- 230000003534 oscillatory Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes
- H03C1/18—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid
- H03C1/24—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to different grid
Landscapes
- Transmitters (AREA)
Abstract
175,635. Ges. f³r Drahtlose Telegraphie. Feb. 16, 1921, [Convention date]. Thermionic modulating systems.-In a wireless transmitter employing a thermionic valve with two grids, the anode feed current and the potential of the space-charge grid are influenced simultaneously by the speech current through separate circuits, and the space-charge grid may be kept at the same potential as the anode. The anode is shown as connected to a positive main, which may be 110 volts above the negative main and the filament F. The grid G is connected as shown to the oscillatory circuit O, for the purpose of generating oscillations. Modulation is effected by the variations of potential applied to the anode A by secondary S of a transformer, the primary P of which carries a current induced by the microphone M through the transformer T1, T2. To prevent the steady component of the current in the circuit P, T2, from magnetizing the covers of the transformers, compensating windings C, T3' are provided and the current therein is adjusted by means of a variable resistance W2. In order that the space-charge grid R may be always at the same potential as the anode A, it is connected to an adjustable point in a resistance W1 which carries the telephone current.
Publications (1)
Publication Number | Publication Date |
---|---|
GB175635A true GB175635A (en) | 1923-05-15 |
Family
ID=1628033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB451022A Expired GB175635A (en) | 1922-02-15 | Improvements in thermionic wireless transmitters |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB175635A (en) |
-
1922
- 1922-02-15 GB GB451022A patent/GB175635A/en not_active Expired
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