GB178971A - Improvements in or relating to high frequency electrical apparatus - Google Patents
Improvements in or relating to high frequency electrical apparatusInfo
- Publication number
- GB178971A GB178971A GB422821A GB422821A GB178971A GB 178971 A GB178971 A GB 178971A GB 422821 A GB422821 A GB 422821A GB 422821 A GB422821 A GB 422821A GB 178971 A GB178971 A GB 178971A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- grid
- circuit
- modulating
- main
- 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
- 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
- H03C1/22—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to same grid
Landscapes
- Electrotherapy Devices (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
178,971. Mitchell's Electrical & Wireless, Ltd., and Heather, R. Feb. 4, 1921. Thermionic modulating systems. - Wireless transmitting apparatus, of the kind in which the modulating valve constitutes a variable grid leak for the oscillating valve generator, has the grid of the modulating-valve normally maintained at such negative potential that the main valve is unable to oscillate, the action of the key or microphone being to vary the potential of the modulator grid and so permit the main valve to oscillate at a greater or less amplitude. The main valve has its plate circuit supplied !by a source Band coupled to the grid oscillatory circuit C in the usual manner. The modulating valve D has its filament d connected to the grid oscillatory circuit C and its plate d<2> connected to a positive point b<1> on the battery B, or on a separate battery, the filament-plate path d, d<2> thus forming a grid leak for the main valve A. The grid circuit of the modulating-valve includes a potentiometer j and is coupled inductively to a microphone circuit E. For telegraphy, a key j<1> may be inserted in the potentiometer circuit. The modulatiug-valve is shunted by a condenser d<1> for the passage of highfrequency current in the main grid circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB422821A GB178971A (en) | 1921-02-04 | 1921-02-04 | Improvements in or relating to high frequency electrical apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB422821A GB178971A (en) | 1921-02-04 | 1921-02-04 | Improvements in or relating to high frequency electrical apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB178971A true GB178971A (en) | 1922-05-04 |
Family
ID=9773143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB422821A Expired GB178971A (en) | 1921-02-04 | 1921-02-04 | Improvements in or relating to high frequency electrical apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB178971A (en) |
-
1921
- 1921-02-04 GB GB422821A patent/GB178971A/en not_active Expired
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