GB157407A - Improvements in wireless telephone transmitters - Google Patents
Improvements in wireless telephone transmittersInfo
- Publication number
- GB157407A GB157407A GB132821A GB132821A GB157407A GB 157407 A GB157407 A GB 157407A GB 132821 A GB132821 A GB 132821A GB 132821 A GB132821 A GB 132821A GB 157407 A GB157407 A GB 157407A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- series
- shunt
- oscillator
- microphone
- 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
- H03C1/26—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to cathode
Landscapes
- Amplifiers (AREA)
- Transmitters (AREA)
Abstract
157,407. Ges. f³r Drahtlose Telegraphie. Dec. 23, 1919, [Convention date]. Thermionic modulating systems.--The oscillations generated by a valve generator are modulated by a pair of valve modulators controlled by a microphone and connected respectively in shunt tc and in series with, the plate-filament path of the generator. As shown in Fig. 3, a microphone 17 is connected through a transformer 16 to the grid circuits of two valves 11, 15 so as to produce opposite potential variations on the two grids. The valve 11 is connected in series between the direct-current source and the filament of the oscillator 2, and the valve 15 is connected in shunt to the oscillator. A high-frequency choke coil 10 and low-frequency choke coil 20 are connected between the valve 15 and the direct current source. The series modulator 11 may be connected between the filaments of the valves 15, 2. Known arrangements employing either the series or the shunt modulator separately are described in the Specification.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEG49888D DE442506C (en) | 1919-12-24 | 1919-12-24 | Device for wireless telephony with cathode tube transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB157407A true GB157407A (en) | 1922-04-10 |
Family
ID=7129140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB132821A Expired GB157407A (en) | 1919-12-24 | 1921-01-10 | Improvements in wireless telephone transmitters |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE442506C (en) |
| GB (1) | GB157407A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2530000A (en) * | 1945-11-01 | 1950-11-14 | Collins Radio Co | Automatic volume control arrangement |
-
1919
- 1919-12-24 DE DEG49888D patent/DE442506C/en not_active Expired
-
1921
- 1921-01-10 GB GB132821A patent/GB157407A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE442506C (en) | 1927-04-12 |
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