GB985968A - Improvements in or relating to telecommunication systems - Google Patents
Improvements in or relating to telecommunication systemsInfo
- Publication number
- GB985968A GB985968A GB1652560A GB1652560A GB985968A GB 985968 A GB985968 A GB 985968A GB 1652560 A GB1652560 A GB 1652560A GB 1652560 A GB1652560 A GB 1652560A GB 985968 A GB985968 A GB 985968A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- wires
- interfering
- induced
- amplifier
- 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
- 230000002452 interceptive effect Effects 0.000 abstract 5
- 238000004804 winding Methods 0.000 abstract 2
- 230000001939 inductive effect Effects 0.000 abstract 1
- 238000006386 neutralization reaction Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/30—Reducing interference caused by unbalanced currents in a normally balanced line
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
985,968. Preventing inductive disturbance. POSTMASTER-GENERAL. May 5, 1961 [May 10, 1960], No. 16525/60. Heading H4R. A telecommunication system having at least two wires exposed to an interfering field includes an amplifier whose output voltage is applied to the wires so as to oppose the induced interfering voltage and whose input voltage is derived from one of the wires, this input voltage being the difference between the said induced and the said output voltages. A voltage E is induced in the line wires 2-4 and test wire 1 by an interfering field in the region 6. The test wire is connected to the input 13 of an amplifier 14 whose output is connected to the primary winding of a transformer 8. A number of secondary windings 9-12 are connected in series with the respective wires 1-4 and they may be effected by simply wrapping the cable (carrying wires 1-4) around the core of the transformer a number of times or by passing the cable through the core. It is shown mathematically that by making the gain of the amplifier sufficiently high consistent with stability the opposing voltage e induced in the wires is equal (or nearly equal) to the interfering voltage E and consequently the interfering voltage is virtually cancelled. This is achieved without any need for precise adjustment of the components and is not subject to a decrease of neutralization with time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1652560A GB985968A (en) | 1960-05-10 | 1960-05-10 | Improvements in or relating to telecommunication systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1652560A GB985968A (en) | 1960-05-10 | 1960-05-10 | Improvements in or relating to telecommunication systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB985968A true GB985968A (en) | 1965-03-10 |
Family
ID=10078905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1652560A Expired GB985968A (en) | 1960-05-10 | 1960-05-10 | Improvements in or relating to telecommunication systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB985968A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3214400A1 (en) * | 1982-04-20 | 1984-02-23 | ANT Nachrichtentechnik GmbH, 7150 Backnang | ARRANGEMENT FOR PROTECTING DEVICES CONNECTED TO CABLES FROM OVERVOLTAGE OR INTERFERENCE VOLTAGE |
-
1960
- 1960-05-10 GB GB1652560A patent/GB985968A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3214400A1 (en) * | 1982-04-20 | 1984-02-23 | ANT Nachrichtentechnik GmbH, 7150 Backnang | ARRANGEMENT FOR PROTECTING DEVICES CONNECTED TO CABLES FROM OVERVOLTAGE OR INTERFERENCE VOLTAGE |
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