GB398240A - Improvements in vacuum tube circuits for electrical signalling systems - Google Patents
Improvements in vacuum tube circuits for electrical signalling systemsInfo
- Publication number
- GB398240A GB398240A GB7286/32A GB728632A GB398240A GB 398240 A GB398240 A GB 398240A GB 7286/32 A GB7286/32 A GB 7286/32A GB 728632 A GB728632 A GB 728632A GB 398240 A GB398240 A GB 398240A
- Authority
- GB
- United Kingdom
- Prior art keywords
- condenser
- valve
- grid
- source
- amplifier
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Selective Calling Equipment (AREA)
Abstract
398,240. Valve circuits ; wireless transmitting-apparatus. STANDARD TELEPHONES & CABLES, Ltd., Connaught House, Aldwych, London.-(Assignees of MatÚriel TÚlÚphonique Soc. Anon. ; 46, Quai de Boulogne, Boulogne-sur-Seine, France.) March 11, 1932, No. 7286. Convention date, Aug. 31, 1931. [Class 40 (v).] A valve oscillator or amplifier is rendered inoperative, for keying in radio transmission or for like purposes, by first charging a condenser and then connecting the condenser in series with another source of biassing voltages in the grid or other circuit of the valve. As shown in Fig. 1, an amplifier T with input impedance R<1>F<1> and output impedance RF has a potentiometer 1 for biassing its grid and a source S1 for supplying its plate circuit. When the amplifier is operative, a condenser C is connected by a switch across a portion of the source S1, and the grid circuit is completed at a contact 6. To paralyze the valve, the switch is thrown over to the left so that the charged condenser C is connected in the grid circuit to assist the bias source 1, so raising the bias to a prohibitive value ; the contact 6 being simultaneously opened. A multi-contact relay operated electromagnetically by the key may be used for performing the switching operation, Fig. 2 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR398240X | 1931-08-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB398240A true GB398240A (en) | 1933-09-11 |
Family
ID=8896600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7286/32A Expired GB398240A (en) | 1931-08-31 | 1932-03-11 | Improvements in vacuum tube circuits for electrical signalling systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB398240A (en) |
-
1932
- 1932-03-11 GB GB7286/32A patent/GB398240A/en not_active Expired
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