GB989790A - Improvements in or relating to telegraph systems - Google Patents
Improvements in or relating to telegraph systemsInfo
- Publication number
- GB989790A GB989790A GB4588261A GB4588261A GB989790A GB 989790 A GB989790 A GB 989790A GB 4588261 A GB4588261 A GB 4588261A GB 4588261 A GB4588261 A GB 4588261A GB 989790 A GB989790 A GB 989790A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- coil
- signals
- positive
- output
- 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
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/20—Repeater circuits; Relay circuits
- H04L25/22—Repeaters for converting two wires to four wires; Repeaters for converting single current to double current
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
989,790. Telegraphy, transistor circuits. BRITISH TELECOMMUNICATIONS RESEARCH Ltd. Dec. 17, 1962 [Dec. 21, 1961], No. 45882/61. Headings H3T and H4P. A telegraph code converter for converting single current D.C. signals into double current signals, includes a magnetic amplifier the output of which is biased to give double current signals. As shown, a low power oscillator cooperates with a transistor T, to produce an alternating current in a coil C of the transformer constituting the amplifier. This produces a corresponding current in a coil B which, when rectified at MR2, produces a steady positive current in a resistance R1. Input signals, either a fixed positive signal or zero, are applied to inputs L1, L2, and these are rectified at MR1 and fed to a coil A of the transformer. The positive signal induces sufficient current in the coil A to saturate the transformer and thus block the output from the coil B. Thus positive and zero currents at the inputs L1, L2 produce zero and positive currents in the resistance R1. A negative bias is applied through resistances R2, R3 to convert this output to double current signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4588261A GB989790A (en) | 1961-12-21 | 1961-12-21 | Improvements in or relating to telegraph systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4588261A GB989790A (en) | 1961-12-21 | 1961-12-21 | Improvements in or relating to telegraph systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB989790A true GB989790A (en) | 1965-04-22 |
Family
ID=10438957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4588261A Expired GB989790A (en) | 1961-12-21 | 1961-12-21 | Improvements in or relating to telegraph systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB989790A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2240803A1 (en) * | 1972-08-18 | 1974-02-28 | Siemens Ag | CIRCUIT ARRANGEMENT FOR EVALUATION OF DC SIGNALS |
| EP0004306A2 (en) * | 1978-03-20 | 1979-10-03 | Siemens Aktiengesellschaft | Circuitry for excess current protection of electronic sending and receiving devices |
-
1961
- 1961-12-21 GB GB4588261A patent/GB989790A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2240803A1 (en) * | 1972-08-18 | 1974-02-28 | Siemens Ag | CIRCUIT ARRANGEMENT FOR EVALUATION OF DC SIGNALS |
| EP0004306A2 (en) * | 1978-03-20 | 1979-10-03 | Siemens Aktiengesellschaft | Circuitry for excess current protection of electronic sending and receiving devices |
| EP0004306A3 (en) * | 1978-03-20 | 1979-10-31 | Siemens Aktiengesellschaft Berlin Und Munchen | Circuitry for excess current protection of electronic sending and receiving devices |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1291597A (en) | Improvements in compass systems | |
| SE324389B (en) | ||
| GB998413A (en) | Improvements in variable impedance devices | |
| GB1504054A (en) | Electrical isolaters | |
| GB989790A (en) | Improvements in or relating to telegraph systems | |
| GB1014580A (en) | Improvements in or relating to current converters including inverter stages | |
| GB965311A (en) | Proportional control a.c. servomotor amplifier | |
| GB1008238A (en) | Improvements in micro-microammeters | |
| GB835534A (en) | Improvements in or relating to symmetrical current circuits fed by direct current | |
| GB1055799A (en) | Improvements in and relating to electric protective arrangements | |
| US3018382A (en) | Frequency detector | |
| ES398599A1 (en) | Precision rectifier with improved transient response | |
| GB1063308A (en) | Transistor switching circuits | |
| GB969151A (en) | Improvements in selective positioning systems | |
| GB847224A (en) | Improvements in or relating to electrical decision element circuits | |
| GB1330117A (en) | Telephone circuits | |
| GB598285A (en) | Improvements in or relating to magnetic amplifiers | |
| GB1029569A (en) | Transistor amplifier | |
| GB965027A (en) | Intelligence transmission systems | |
| GB1078997A (en) | Electronic signal selector | |
| GB936645A (en) | Magnetic core decoding trees | |
| GB573793A (en) | Amplifying arrangement using saturable bore reactors | |
| GB1277424A (en) | Improvements in or relating to electrical signal level discriminators | |
| FR2126090B1 (en) | ||
| GB940980A (en) | Improvements in or relating to circuit arrangements embodying transistors |