JPS55141839A - Special radio communication system - Google Patents

Special radio communication system

Info

Publication number
JPS55141839A
JPS55141839A JP5039579A JP5039579A JPS55141839A JP S55141839 A JPS55141839 A JP S55141839A JP 5039579 A JP5039579 A JP 5039579A JP 5039579 A JP5039579 A JP 5039579A JP S55141839 A JPS55141839 A JP S55141839A
Authority
JP
Japan
Prior art keywords
signal
transmission
unit
relay
radio communication
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.)
Pending
Application number
JP5039579A
Other languages
Japanese (ja)
Inventor
Susumu Nakabayashi
Nobuo Sugibayashi
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.)
Toyo Communication Equipment Co Ltd
Original Assignee
Toyo Communication Equipment 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 Toyo Communication Equipment Co Ltd filed Critical Toyo Communication Equipment Co Ltd
Priority to JP5039579A priority Critical patent/JPS55141839A/en
Publication of JPS55141839A publication Critical patent/JPS55141839A/en
Pending 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)
  • Near-Field Transmission Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE:To realize the special radio communication system which enables the mobile radio communication in the tunnel of long length comparatively, by providing the relay unit at the both ends of leakage coaxial cable (LCX). CONSTITUTION:The relay units 12, 13 are provided at the both ends of LCX9, and the mobile radio units 10, 11 in transmission and reception frequencies f1, f2 respectively are opposed along LCX9. The transmission signal f1 from the mobile unit 10 is received at the reception section R11 of the relay unit 12 and transmitted from the transmission section T21 as the signal in frequency f2 including the control signal P1 from the control section C1. This signal is received with the mobile unit 11. The relay unit 13 converts the transmission signal f2 from the mobile unit 11 into frequency f1 including the control signal P1, for transmission. The both relay units 12, 13 identify the reception signal whether it is from the mobile unit or the opposing relay unit with the control signal, and the transmission from itself is stopped, when the reception signal comes from the opposing relay unit.
JP5039579A 1979-04-23 1979-04-23 Special radio communication system Pending JPS55141839A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5039579A JPS55141839A (en) 1979-04-23 1979-04-23 Special radio communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5039579A JPS55141839A (en) 1979-04-23 1979-04-23 Special radio communication system

Publications (1)

Publication Number Publication Date
JPS55141839A true JPS55141839A (en) 1980-11-06

Family

ID=12857676

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5039579A Pending JPS55141839A (en) 1979-04-23 1979-04-23 Special radio communication system

Country Status (1)

Country Link
JP (1) JPS55141839A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61220098A (en) * 1985-03-26 1986-09-30 東京電力株式会社 Remote control for internal tunnel apparatus
US4910793A (en) * 1986-12-08 1990-03-20 Alsthom Two-way transmission system for ground/mobile station communications
FR2659512A1 (en) * 1990-03-09 1991-09-13 Cogema UHF communications installation
JP2015012460A (en) * 2013-06-28 2015-01-19 ホーチキ株式会社 Tunnel radio communication assist facility

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61220098A (en) * 1985-03-26 1986-09-30 東京電力株式会社 Remote control for internal tunnel apparatus
US4910793A (en) * 1986-12-08 1990-03-20 Alsthom Two-way transmission system for ground/mobile station communications
FR2659512A1 (en) * 1990-03-09 1991-09-13 Cogema UHF communications installation
US5230080A (en) * 1990-03-09 1993-07-20 Compagnie Generale Des Matieres Nucleaires Ultra-high frequency communication installation
JP2015012460A (en) * 2013-06-28 2015-01-19 ホーチキ株式会社 Tunnel radio communication assist facility

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