GB291083A - Arrangement for the automatic regulation of the degree of transmission of transmission systems, particularly of high frequency transmission systems - Google Patents
Arrangement for the automatic regulation of the degree of transmission of transmission systems, particularly of high frequency transmission systemsInfo
- Publication number
- GB291083A GB291083A GB1072028A GB1072028A GB291083A GB 291083 A GB291083 A GB 291083A GB 1072028 A GB1072028 A GB 1072028A GB 1072028 A GB1072028 A GB 1072028A GB 291083 A GB291083 A GB 291083A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- grid
- control
- amplifier
- fading
- 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
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/005—Control of transmission; Equalising
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
Abstract
291,083. Siemens & Halske Akt.-Ges. May 28, 1927, [Convention date], Fading, preventing ;-Relates to an improved method of automatically regulating the strength of received signals to compensate for fading effects, of the kind described in the Specification 289,050, wherein a control frequency lying outside the signal frequencies is applied at the receiving end to shift the effective grid-bias of a valve receiving both signal and control frequencies. As shown in the Figure, the output circuit of the first valve or rectifier g comprises two filter circuits c, s, the first of which passes the useful signalling frequencies to an amplifier n, whilst the second separates the special control frequency and passes it to the grid of an auxiliary valve h. A resistance r in the output circuit of the latter is also included in the grid circuit of the valve g, and raises or lowers the effective grid potential of this valve in accordance with fluctuation in the received signals due to fading &c. The auxiliary valve h may similarly control the effective grid bias of an amplifier valve inserted before the detector g. When used for a picture transmission, the usual synchronizing frequency may also serve as the gain-control frequency. Alternatively the grid or anode currents of the valve h can be used to control the grid bias of the first amplifier valve, or to operate the mechanical form of control relay described in Specification 289,050.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES79974D DE569789C (en) | 1927-04-21 | 1927-05-28 | Device for automatic control of the efficiency of transmission systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB291083A true GB291083A (en) | 1929-04-25 |
Family
ID=7508575
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1072028A Expired GB291083A (en) | 1927-05-28 | 1928-04-11 | Arrangement for the automatic regulation of the degree of transmission of transmission systems, particularly of high frequency transmission systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB291083A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2497883A (en) * | 1943-01-28 | 1950-02-21 | Sperry Corp | Electronic computer |
DE933456C (en) * | 1929-12-19 | 1955-09-29 | Erna Schoeller | Receiver with automatic volume control |
-
1928
- 1928-04-11 GB GB1072028A patent/GB291083A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE933456C (en) * | 1929-12-19 | 1955-09-29 | Erna Schoeller | Receiver with automatic volume control |
US2497883A (en) * | 1943-01-28 | 1950-02-21 | Sperry Corp | Electronic computer |
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