GB149466A - Improvements in and relating to the use of electron discharge devices in signalling systems - Google Patents
Improvements in and relating to the use of electron discharge devices in signalling systemsInfo
- Publication number
- GB149466A GB149466A GB1347919A GB1347919A GB149466A GB 149466 A GB149466 A GB 149466A GB 1347919 A GB1347919 A GB 1347919A GB 1347919 A GB1347919 A GB 1347919A GB 149466 A GB149466 A GB 149466A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- signalling
- coupled
- oppositely
- current
- 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
- H03C1/20—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to anode
Landscapes
- Transmitters (AREA)
Abstract
149,466. British Thomson-Houston Co., (General Electric Co.). May 28, 1919. Wireless signalling.-In systems such as that shown in Fig. 3 of Specification 15237/15, in which the potential in the plate circuit of an oscillationgenerating valve is supplied entirely by a source of low-frequency signalling-current, such as telephonic voice-currents, two oppositely-connected valves are employed for generating oscillations during the positive and negative elements of the signalling current. The plate circuits of the valves 19, 20, Fig. 2, are oppositely connected to the transformer 23, to which signalling current is supplied by a microphone 14, directly or through an amplifier. The plate circuits include a coil 8, coupled to a coil 9 in the aerial, and the grid circuits are oppositely coupled bv coils 21, 22 to a coil 11, or the coil 11 may be omitted, the coils. 21, 22 as well as the coil 8 being coupled to the coil 9. The arrangement described has the advantage that when signals are not actually being transmitted the aerial is in condition for receiving signals without disconnecting the transmitting-apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1347919A GB149466A (en) | 1919-05-28 | 1919-05-28 | Improvements in and relating to the use of electron discharge devices in signalling systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1347919A GB149466A (en) | 1919-05-28 | 1919-05-28 | Improvements in and relating to the use of electron discharge devices in signalling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB149466A true GB149466A (en) | 1920-08-19 |
Family
ID=10023707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1347919A Expired GB149466A (en) | 1919-05-28 | 1919-05-28 | Improvements in and relating to the use of electron discharge devices in signalling systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB149466A (en) |
-
1919
- 1919-05-28 GB GB1347919A patent/GB149466A/en not_active Expired
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