GB272596A - Improvements in telegraph circuits - Google Patents
Improvements in telegraph circuitsInfo
- Publication number
- GB272596A GB272596A GB718426A GB718426A GB272596A GB 272596 A GB272596 A GB 272596A GB 718426 A GB718426 A GB 718426A GB 718426 A GB718426 A GB 718426A GB 272596 A GB272596 A GB 272596A
- Authority
- GB
- United Kingdom
- Prior art keywords
- line
- windings
- currents
- signalling
- earth
- 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
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
272,596. Standard Telephones & Cables, Ltd., and Thompson, A. E. March 15, 1926. Eliminating effects of disturbing currents; duplex telegraphs.-In a two-line circuit one line with an earth return is used for the signalling currents, and the other line is so connected conductively to the signalling apparatus as to protect the signalling circuit against interference and to afford protection to neighbouring tedegraph or telephone circuits. The transmitting apparatus is connected to one line through the primary of an induction coil, of which the secondary is connected to the other line in such a manner that surge currents are transmitted over the two lines in opposite directions. The figure shows a differential duplex arrangement in which the lines 1, 2 are balanced in known manner by the networks 8, 12. Each station is provided with a polarized receiving relay 3 of which two windings 4, 5 are in series between the line 1 and one side of the adjacent network, and two other windings 6, 7 are in series between the line 1 and the other side of the network. The windings 4, 5, 6, and 7 have equal electrical characteristics. The local transmitter 10 is connected to the junction of the windings 4, 5 through one winding of a transformer 9, and the junction of the windings 6, 7 is connected to earth through the other winding of the transformer. Earth currents and currents due to interference from neighbouring circuits neutralize each other in the relay windings 5, 7 at each station.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB718426A GB272596A (en) | 1926-03-15 | 1926-03-15 | Improvements in telegraph circuits |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB718426A GB272596A (en) | 1926-03-15 | 1926-03-15 | Improvements in telegraph circuits |
Publications (1)
Publication Number | Publication Date |
---|---|
GB272596A true GB272596A (en) | 1927-06-15 |
Family
ID=9828213
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB718426A Expired GB272596A (en) | 1926-03-15 | 1926-03-15 | Improvements in telegraph circuits |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB272596A (en) |
-
1926
- 1926-03-15 GB GB718426A patent/GB272596A/en not_active Expired
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