GB506658A - Improvements in or relating to keying circuit arrangements for radio and like transmitters - Google Patents
Improvements in or relating to keying circuit arrangements for radio and like transmittersInfo
- Publication number
- GB506658A GB506658A GB33249/37A GB3324937A GB506658A GB 506658 A GB506658 A GB 506658A GB 33249/37 A GB33249/37 A GB 33249/37A GB 3324937 A GB3324937 A GB 3324937A GB 506658 A GB506658 A GB 506658A
- Authority
- GB
- United Kingdom
- Prior art keywords
- biassed
- stages
- during
- potentiometer
- valves
- 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)
- Transmitters (AREA)
- Microwave Amplifiers (AREA)
Abstract
506,658. Valve modulating circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., and WASSELL, H. J. H. Dec. 1, 1937, No. 33249. [Class 40 (v)] In keying circuit arrangements for radio transmitters in which one or more of the high frequency stages is biassed to take a considerable " dead loss while some of the other stages are biassed to " cut-off " during " spaces," auxiliary valves are arranged to provide low resistance paths for the grid currents of the high frequency valves during the " mark " condition. Stages 2, 3 and 4 of a radio transmitter are biassed to " cut-off " during " spaces " by connection at 20 to the potentiometer 17 in the anode circuit of the keying valve 10 which is then conductive. Stage 5 is biassed to take a " dead-loss " by connection to point 23 on potentiometer 17. Auxiliary valves 7, 12 with their anodes connected to earth and cathodes connected to points 20, 23 have their grids connected to points 18, 22, on the potentiometer, so chosen that they are nonconducting in the " space " condition shown. During " marking " the key 15 is closed and the anode current of valve 10 is cut off by the negative bias 14 ; valves 7, 12 are then conducting, since their grids and cathodes are at approximately the same potential, and provide low resistance paths for the grid currents of stages 2, 3, 4, and 5.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL61923D NL61923C (en) | 1937-12-01 | ||
| GB33249/37A GB506658A (en) | 1937-12-01 | 1937-12-01 | Improvements in or relating to keying circuit arrangements for radio and like transmitters |
| US240641A US2217929A (en) | 1937-12-01 | 1938-11-16 | Keying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB33249/37A GB506658A (en) | 1937-12-01 | 1937-12-01 | Improvements in or relating to keying circuit arrangements for radio and like transmitters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB506658A true GB506658A (en) | 1939-06-01 |
Family
ID=10350460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB33249/37A Expired GB506658A (en) | 1937-12-01 | 1937-12-01 | Improvements in or relating to keying circuit arrangements for radio and like transmitters |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2217929A (en) |
| GB (1) | GB506658A (en) |
| NL (1) | NL61923C (en) |
-
0
- NL NL61923D patent/NL61923C/xx active
-
1937
- 1937-12-01 GB GB33249/37A patent/GB506658A/en not_active Expired
-
1938
- 1938-11-16 US US240641A patent/US2217929A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| NL61923C (en) | |
| US2217929A (en) | 1940-10-15 |
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