GB159603A - Improvements in and relating to electrical signalling systems - Google Patents
Improvements in and relating to electrical signalling systemsInfo
- Publication number
- GB159603A GB159603A GB2993619A GB2993619A GB159603A GB 159603 A GB159603 A GB 159603A GB 2993619 A GB2993619 A GB 2993619A GB 2993619 A GB2993619 A GB 2993619A GB 159603 A GB159603 A GB 159603A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- note
- bridge
- heard
- telephones
- 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
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
159,603. British Thomson - Houston Co., Ltd., (General Electric Co.). Dec. 1, 1919. Thermionic detectors; audible reception of unmodulated continuous waves. - A wheatstone-bridge arrangement comprising a thermionic valve in one of the balanced arms is employed to detect signalling eurrents, particularly of a frequency below audibility; it may also serve to receive continuous-wave wireless radiators without heterodyning or the use of a " ticker." A source of current 13 of audible frequency is normally balanced across the arms 1 - - 4 so that no note is heard in the telephones 16. When signal energy flows through a resistance 22, the potential on the grid 8 of a valve 5 is varied and alters the resistance of the plate circuit of the valve, thereby upsetting the bridge balance, so that the note from the source 13 is heard in the phones so long as the signalling current flows. A second valve may be inserted in the arm 2 nf the bridge to facilitate balancing. A valve amplifier may be used to augment the note in the telephones.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2993619A GB159603A (en) | 1919-12-01 | 1919-12-01 | Improvements in and relating to electrical signalling systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2993619A GB159603A (en) | 1919-12-01 | 1919-12-01 | Improvements in and relating to electrical signalling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB159603A true GB159603A (en) | 1921-03-01 |
Family
ID=10299611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2993619A Expired GB159603A (en) | 1919-12-01 | 1919-12-01 | Improvements in and relating to electrical signalling systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB159603A (en) |
-
1919
- 1919-12-01 GB GB2993619A patent/GB159603A/en not_active Expired
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