GB503758A - Improvements in or relating to electric signalling systems - Google Patents
Improvements in or relating to electric signalling systemsInfo
- Publication number
- GB503758A GB503758A GB2680137A GB2680137A GB503758A GB 503758 A GB503758 A GB 503758A GB 2680137 A GB2680137 A GB 2680137A GB 2680137 A GB2680137 A GB 2680137A GB 503758 A GB503758 A GB 503758A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- signal
- operate
- rectified
- frequency
- 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
- 230000011664 signaling Effects 0.000 title 1
- 238000004804 winding Methods 0.000 abstract 2
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/12—Electric signal transmission systems in which the signal transmitted is frequency or phase of AC
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrotherapy Devices (AREA)
- Measuring Volume Flow (AREA)
Abstract
503,758. Thermionic valve. relay circuits. GENERAL ELECTRIC CO., Ltd., and WESTELL, E. P. L. Oct. 4, 1937, No. 26801. [Class 40 (v)] [Also in Group XXXVIII] A relay 13 is operated by a signal of particular frequency but does not operate if any additional signal of different frequency is present. The relay has two windings energized by the anode current of a cumulative-grid rectifier 10 and by rectified signal currents respectively. The circuit 12 is tuned to signal frequency so that only signal currents are rectified at 14 to energize the associated .winding. The rectifying valve 10 is biassed so that the grid becomes positive and rectification takes place only when signals additional to the correct signals are received. The reduction of anode current consequent upon rectification causes falure of relay 13 tb operate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2680137A GB503758A (en) | 1937-10-04 | 1937-10-04 | Improvements in or relating to electric signalling systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2680137A GB503758A (en) | 1937-10-04 | 1937-10-04 | Improvements in or relating to electric signalling systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB503758A true GB503758A (en) | 1939-04-04 |
Family
ID=10249441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2680137A Expired GB503758A (en) | 1937-10-04 | 1937-10-04 | Improvements in or relating to electric signalling systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB503758A (en) |
-
1937
- 1937-10-04 GB GB2680137A patent/GB503758A/en not_active Expired
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