GB351051A - Improvements in or relating to keying arrangements for use in high frequency circuits - Google Patents
Improvements in or relating to keying arrangements for use in high frequency circuitsInfo
- Publication number
- GB351051A GB351051A GB8988/30A GB898830A GB351051A GB 351051 A GB351051 A GB 351051A GB 8988/30 A GB8988/30 A GB 8988/30A GB 898830 A GB898830 A GB 898830A GB 351051 A GB351051 A GB 351051A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifiers
- load
- during
- bias
- during spacing
- 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
- 230000000135 prohibitive effect Effects 0.000 abstract 2
- 230000001419 dependent effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
- 238000010079 rubber tapping Methods 0.000 abstract 1
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)
- Amplifiers (AREA)
- Microwave Amplifiers (AREA)
Abstract
351,051. Wireless transmitting systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, London, and LUNNON, F. C., Westdene, Roxwell Road, Chelmsford, Essex. March 20, 1930, No. 8988. [Class 40 (v).] Radio or like telegraphy transmitters comprising an oscillator and one or more amplifiers are keyed in such a wav that one or more valves which act as amplifiers during marking periods have their circuits changed so that they function to maintain a load on the H.T. supply during spacing periods. As shown the circuit comprises an oscillator valve O and three amplifiers V1, V2, V3, all fed from H.T. supply B. The grids are biased from tappings Po .. P3 on an impedance Z which is included in a common branch of the supply circuit B. Keying is effected by a switch K which shortcircuits the impedance Z during marking and therefore allows the grid bias to be operative only during spacing. In one method of operation, the oscillator O ceases to maintain its oscillation during spacing owing to the prohibitive bias applied by the tap Po. The amplifier valves V1, V2, V3 continue to take plate current from the source B to an extent dependent on the bias supplied by the taps P1, P2, P3 ; and these are preferably adjusted so that the load during spacing is about one-quarter of the marking load. As an alternative a prohibitive bias may be applied during spacing to one of the earlier amplifiers, and the plate current load maintained by the later amplifiers.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8988/30A GB351051A (en) | 1930-03-20 | 1930-03-20 | Improvements in or relating to keying arrangements for use in high frequency circuits |
| FR708795D FR708795A (en) | 1930-03-20 | 1931-01-03 | Improvements to handling devices used in high frequency circuits |
| US520587A US1938631A (en) | 1930-03-20 | 1931-03-06 | Transmitter |
| BE378336D BE378336A (en) | 1930-03-20 | 1931-03-19 | |
| DEM114597D DE538841C (en) | 1930-03-20 | 1931-03-20 | Push-button circuit for transmitter cascades with load balancing tubes for taking up the energy during the touch pauses |
| DEM123937D DE590808C (en) | 1930-03-20 | 1932-08-19 | Circuit for transmitter cascades |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8988/30A GB351051A (en) | 1930-03-20 | 1930-03-20 | Improvements in or relating to keying arrangements for use in high frequency circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB351051A true GB351051A (en) | 1931-06-22 |
Family
ID=9863189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8988/30A Expired GB351051A (en) | 1930-03-20 | 1930-03-20 | Improvements in or relating to keying arrangements for use in high frequency circuits |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US1938631A (en) |
| BE (1) | BE378336A (en) |
| DE (2) | DE538841C (en) |
| FR (1) | FR708795A (en) |
| GB (1) | GB351051A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE755785C (en) * | 1933-03-16 | 1952-03-31 | Marconi Wireless Telegraph Co | Arrangement for the automatic activation of a transmitter with the help of rectified modulation oscillations |
-
1930
- 1930-03-20 GB GB8988/30A patent/GB351051A/en not_active Expired
-
1931
- 1931-01-03 FR FR708795D patent/FR708795A/en not_active Expired
- 1931-03-06 US US520587A patent/US1938631A/en not_active Expired - Lifetime
- 1931-03-19 BE BE378336D patent/BE378336A/xx unknown
- 1931-03-20 DE DEM114597D patent/DE538841C/en not_active Expired
-
1932
- 1932-08-19 DE DEM123937D patent/DE590808C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US1938631A (en) | 1933-12-12 |
| FR708795A (en) | 1931-07-28 |
| BE378336A (en) | 1931-04-30 |
| DE538841C (en) | 1931-11-17 |
| DE590808C (en) | 1934-01-11 |
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