GB1432297A - Selective calling arrangement - Google Patents

Selective calling arrangement

Info

Publication number
GB1432297A
GB1432297A GB1523774A GB1523774A GB1432297A GB 1432297 A GB1432297 A GB 1432297A GB 1523774 A GB1523774 A GB 1523774A GB 1523774 A GB1523774 A GB 1523774A GB 1432297 A GB1432297 A GB 1432297A
Authority
GB
United Kingdom
Prior art keywords
repeater
gain
signal
radiating
coded
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
GB1523774A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1523774A priority Critical patent/GB1432297A/en
Priority to DE19752514568 priority patent/DE2514568C2/en
Publication of GB1432297A publication Critical patent/GB1432297A/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
    • B61L3/16—Continuous control along the route
    • B61L3/22—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation
    • B61L3/225—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation using separate conductors along the route

Abstract

1432297 Radio signalling STANDARD TELEPHONES & CABLES Ltd 5 April 1974 15237/74 Heading H4L In an arrangement for selectively calling a mobile receiver, e.g. in a transport system, via a succession of lengths of radiating cable coupled together by repeaters, means are provided for effectively energizing only the length of radiating cable adjacent the mobile receiver to be called so that receivers adjacent other lengths are not called. A transmitter is arranged to supply the cable with the radio frequency signal to be radiated and with a non-radiating signal coded with the address signal of a repeater, each repeater having a different address number in accordance with its position along the route. Each repeater includes means for switching the gain of the repeater from a normal level to a higher or a lower level and control means responsive to a coded signal identifying that repeater to cause the switching means to switch the gain to a higher level, sufficient to unmute the receivers, and to a coded signal identifying the immediately preceding repeater to switch the gain to the lower level.
GB1523774A 1974-04-05 1974-04-05 Selective calling arrangement Expired GB1432297A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1523774A GB1432297A (en) 1974-04-05 1974-04-05 Selective calling arrangement
DE19752514568 DE2514568C2 (en) 1974-04-05 1975-04-03 Call facility for rail vehicles equipped with high-frequency receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1523774A GB1432297A (en) 1974-04-05 1974-04-05 Selective calling arrangement

Publications (1)

Publication Number Publication Date
GB1432297A true GB1432297A (en) 1976-04-14

Family

ID=10055487

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1523774A Expired GB1432297A (en) 1974-04-05 1974-04-05 Selective calling arrangement

Country Status (2)

Country Link
DE (1) DE2514568C2 (en)
GB (1) GB1432297A (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1235888A (en) * 1967-08-17 1971-06-16 Sumitomo Electric Industries Improvements in or relating to radio transmission systems for communication with moving bodies
BE799885R (en) * 1972-05-26 1973-09-17 Thomson Csf IMPROVEMENTS TO INTERCOMMUNICATION DEVICES WITH LIMITED RADIATION,

Also Published As

Publication number Publication date
DE2514568A1 (en) 1975-10-16
DE2514568C2 (en) 1984-08-23

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee