GB1239231A - - Google Patents

Info

Publication number
GB1239231A
GB1239231A GB128168A GB1239231DA GB1239231A GB 1239231 A GB1239231 A GB 1239231A GB 128168 A GB128168 A GB 128168A GB 1239231D A GB1239231D A GB 1239231DA GB 1239231 A GB1239231 A GB 1239231A
Authority
GB
United Kingdom
Prior art keywords
line
base station
radio
signals
relay
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
GB128168A
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 filed Critical
Publication of GB1239231A publication Critical patent/GB1239231A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/28—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium using the near field of leaky cables, e.g. of leaky coaxial cables

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

1,239,231. Radio signalling. COAL INDUSTRY (PATENTS) Ltd. 8 April, 1969 F9 Jan., 1968], No. 1281/68. Heading H4L. In a two-way radio communication system between a fixed base station connected to terminals A, B and one or more mobile stations M, a radiating transmission line TL extends between the base station and zones in which the mobile stations operate. The base station transmits and receives at speech frequency over the transmission line TL and one or more relay transmitters TX1, &c. feed to the line radio frequency signals modulated with speech signals received over the line from the base station. Relay receivers RX1, &c. demodulate radio frequency signals on the line and feed the resulting speech signals over the line to the base station. The arrangement is such that mobile stations can receive radio signals radiating from and transmit radio signals to the line acting as an antenna. Filter circuits are described for preventing interaction between the radio and audio frequencies at the relay stations. The frequencies transmitted by transmitters RX1, &c. may be arranged to be spaced with a frequency band which is within the response band of a mobile receiver. The system may be used for communication or remote control of machinery in mines or other tunnels or along a railway track or motor road.
GB128168A 1968-01-09 1968-01-09 Expired GB1239231A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB128168 1968-01-09

Publications (1)

Publication Number Publication Date
GB1239231A true GB1239231A (en) 1971-07-14

Family

ID=9719249

Family Applications (1)

Application Number Title Priority Date Filing Date
GB128168A Expired GB1239231A (en) 1968-01-09 1968-01-09

Country Status (1)

Country Link
GB (1) GB1239231A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2322921A1 (en) * 1972-05-09 1973-11-29 Coal Industry Patents Ltd HIGH FREQUENCY COMMUNICATION SYSTEM
US4038601A (en) * 1974-02-18 1977-07-26 Societe Nationale Industrielle Aerospatiale Device for connecting peripheral units to a line for transmitting data by pulse code modulation
GB2142508A (en) * 1983-06-29 1985-01-16 Private Mobile Rentals Limited Improvements relating to communications systems
US4972505A (en) * 1988-12-06 1990-11-20 Isberg Reuben A Tunnel distributed cable antenna system with signal top coupling approximately same radiated energy

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2322921A1 (en) * 1972-05-09 1973-11-29 Coal Industry Patents Ltd HIGH FREQUENCY COMMUNICATION SYSTEM
US4038601A (en) * 1974-02-18 1977-07-26 Societe Nationale Industrielle Aerospatiale Device for connecting peripheral units to a line for transmitting data by pulse code modulation
GB2142508A (en) * 1983-06-29 1985-01-16 Private Mobile Rentals Limited Improvements relating to communications systems
US4972505A (en) * 1988-12-06 1990-11-20 Isberg Reuben A Tunnel distributed cable antenna system with signal top coupling approximately same radiated energy

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee