GB482569A - Improvements in or relating to methods for the automatic control of the level in carrier frequency telegraph systems - Google Patents
Improvements in or relating to methods for the automatic control of the level in carrier frequency telegraph systemsInfo
- Publication number
- GB482569A GB482569A GB20655/37A GB2065537A GB482569A GB 482569 A GB482569 A GB 482569A GB 20655/37 A GB20655/37 A GB 20655/37A GB 2065537 A GB2065537 A GB 2065537A GB 482569 A GB482569 A GB 482569A
- Authority
- GB
- United Kingdom
- Prior art keywords
- level
- carrier frequency
- valve
- relating
- methods
- 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
- H04L27/08—Amplitude regulation arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Circuits Of Receivers In General (AREA)
- Details Of Television Systems (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
482,569. Valve circuits. SIEMENS & HALSKE AKT.-GES. July 26, 1937, No. 20655. Convention date, July 24, 1936. [Class 40 (v)] In order automatically to control the signal level in carrier frequency telegraph systems by means of the grid current of a threeelectrode valve the added bias is arranged to be equal to half the difference between the normal input level to be maintained and the increased input level. Thus the grid of valve R, which operates relay ER, is normally biassed to " bottom-bend " and the grid circuit includes two equal resistances R1, R2 shunted by a small condenser C1, the resistance R2 being shunted by a large condenser C2. Other and more complex arrangements of resistances and condensers to produce the same effect, are described, Figs. 3 and 4 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE482569X | 1936-07-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB482569A true GB482569A (en) | 1938-03-31 |
Family
ID=6542850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20655/37A Expired GB482569A (en) | 1936-07-24 | 1937-07-26 | Improvements in or relating to methods for the automatic control of the level in carrier frequency telegraph systems |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2235021A (en) |
| FR (1) | FR821997A (en) |
| GB (1) | GB482569A (en) |
-
1937
- 1937-05-19 FR FR821997D patent/FR821997A/en not_active Expired
- 1937-07-22 US US154976A patent/US2235021A/en not_active Expired - Lifetime
- 1937-07-26 GB GB20655/37A patent/GB482569A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2235021A (en) | 1941-03-18 |
| FR821997A (en) | 1937-12-17 |
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