GB806901A - Improvements in carrier wave communication systems - Google Patents

Improvements in carrier wave communication systems

Info

Publication number
GB806901A
GB806901A GB1882756A GB1882756A GB806901A GB 806901 A GB806901 A GB 806901A GB 1882756 A GB1882756 A GB 1882756A GB 1882756 A GB1882756 A GB 1882756A GB 806901 A GB806901 A GB 806901A
Authority
GB
United Kingdom
Prior art keywords
sheath
ground
cable
june
transmission line
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
Application number
GB1882756A
Inventor
James Moir
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB1882756A priority Critical patent/GB806901A/en
Publication of GB806901A publication Critical patent/GB806901A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L3/00—Devices along the route for controlling devices on the vehicle or vehicle train, e.g. to release brake, to operate a warning signal
    • B61L3/02—Devices along the route for controlling devices on the vehicle or vehicle train, e.g. to release brake, to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control
    • B61L3/08—Devices along the route for controlling devices on the vehicle or vehicle train, e.g. to release brake, to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically
    • B61L3/10—Devices along the route for controlling devices on the vehicle or vehicle train, e.g. to release brake, to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically using current passing between devices along the route and devices on the vehicle train
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/56—Circuits for coupling, blocking, or by-passing of signals

Abstract

806,901. Signalling over power circuits. BRITISH THOMSON-HOUSTON CO. Ltd. June 18, 1957 [June 18, 1956], No. 18827/56. Class 40 (4). In a carrier system for communicating to and between electric traction vehicles each of which is supplied with operating current via a sheathed insulated cable 5 leading from a contact 4 on a trolley arm 3 on the vehicle 2 which contact 4 connects with an overhead power transmission line 1, the capacitance present between the sheath 7 and the conductor 8 of the cable 5 is employed as a coupling capacitor to convey the modulated carrier signals between the transmission line 1 and communication equipment 6 in the vehicle. As shown, the equipment 6 is connected to the primary winding of transformer 9, the secondary 10 of which is connected between the sheath 7 and ground. A non-linear resistor 12, preferably made of the material sold under the Registered Trade Mark " Metrosil," is connected between the sheath 7 and ground in parallel with the secondary 10. In the event of the cable insulation breaking down the non-linear resistor will become of low impedance and will provide an effective short-circuit to ground.
GB1882756A 1956-06-18 1956-06-18 Improvements in carrier wave communication systems Expired GB806901A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1882756A GB806901A (en) 1956-06-18 1956-06-18 Improvements in carrier wave communication systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1882756A GB806901A (en) 1956-06-18 1956-06-18 Improvements in carrier wave communication systems

Publications (1)

Publication Number Publication Date
GB806901A true GB806901A (en) 1959-01-07

Family

ID=10119089

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1882756A Expired GB806901A (en) 1956-06-18 1956-06-18 Improvements in carrier wave communication systems

Country Status (1)

Country Link
GB (1) GB806901A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996023368A1 (en) * 1995-01-27 1996-08-01 Tsl Technology Ltd. Method and apparatus for communicating by means of an electrical power cable
GB2310986A (en) * 1995-01-27 1997-09-10 Expro North Sea Ltd Method and apparatus for communicating by means of an electrical power

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996023368A1 (en) * 1995-01-27 1996-08-01 Tsl Technology Ltd. Method and apparatus for communicating by means of an electrical power cable
GB2310986A (en) * 1995-01-27 1997-09-10 Expro North Sea Ltd Method and apparatus for communicating by means of an electrical power

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