GB2200270B - Apparatus for providing two-way communication in underground facilities - Google Patents

Apparatus for providing two-way communication in underground facilities

Info

Publication number
GB2200270B
GB2200270B GB8729449A GB8729449A GB2200270B GB 2200270 B GB2200270 B GB 2200270B GB 8729449 A GB8729449 A GB 8729449A GB 8729449 A GB8729449 A GB 8729449A GB 2200270 B GB2200270 B GB 2200270B
Authority
GB
United Kingdom
Prior art keywords
providing
way communication
underground facilities
underground
facilities
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 - Fee Related
Application number
GB8729449A
Other versions
GB8729449D0 (en
GB2200270A (en
Inventor
Antti Berg
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.)
Outokumpu Oyj
Original Assignee
Outokumpu Oyj
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 Outokumpu Oyj filed Critical Outokumpu Oyj
Publication of GB8729449D0 publication Critical patent/GB8729449D0/en
Publication of GB2200270A publication Critical patent/GB2200270A/en
Application granted granted Critical
Publication of GB2200270B publication Critical patent/GB2200270B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Radio Transmission System (AREA)
  • Transmitters (AREA)
GB8729449A 1987-01-22 1987-12-17 Apparatus for providing two-way communication in underground facilities Expired - Fee Related GB2200270B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI870286A FI77131C (en) 1987-01-22 1987-01-22 Device for providing bi-directional communication in underground spaces

Publications (3)

Publication Number Publication Date
GB8729449D0 GB8729449D0 (en) 1988-02-03
GB2200270A GB2200270A (en) 1988-07-27
GB2200270B true GB2200270B (en) 1991-06-26

Family

ID=8523819

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8729449A Expired - Fee Related GB2200270B (en) 1987-01-22 1987-12-17 Apparatus for providing two-way communication in underground facilities

Country Status (5)

Country Link
JP (1) JPH07118680B2 (en)
DE (1) DE3741866C2 (en)
FI (1) FI77131C (en)
FR (1) FR2610156B1 (en)
GB (1) GB2200270B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3942320A1 (en) * 1989-10-10 1991-04-11 Wk Elektronik Gmbh Communication system esp. for salt mine - uses single frequency phase locked loop radio system at base stations connected by wire to central station

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2083977A (en) * 1980-08-26 1982-03-31 Standard Telephones Cables Ltd Single channel duplex radio system
GB2109197A (en) * 1981-10-13 1983-05-25 Standard Telephones Cables Ltd Radio system
GB2126845A (en) * 1982-07-27 1984-03-28 Arf Products Radio communication systems for underground mines

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3825829A (en) * 1973-01-29 1974-07-23 Motorola Inc Radio system employing simultaneously triggered pulse repeaters
JPS599041B2 (en) * 1976-10-05 1984-02-29 三菱電機株式会社 thin film mirror
JPS54123819A (en) * 1978-03-17 1979-09-26 Kiyoshi Takizawa Under soil or water signal transmitter
JPS5726942A (en) * 1980-07-25 1982-02-13 Tokyo Gas Co Ltd Data transmission system
FR2538645B1 (en) * 1982-12-28 1986-04-11 Thomson Csf METHOD AND DEVICE FOR INTERPOLATING SPEECH IN A DIGITAL SPEECH TRANSMISSION SYSTEM

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2083977A (en) * 1980-08-26 1982-03-31 Standard Telephones Cables Ltd Single channel duplex radio system
GB2109197A (en) * 1981-10-13 1983-05-25 Standard Telephones Cables Ltd Radio system
GB2126845A (en) * 1982-07-27 1984-03-28 Arf Products Radio communication systems for underground mines

Also Published As

Publication number Publication date
FR2610156B1 (en) 1994-06-10
DE3741866A1 (en) 1988-08-04
FI870286A (en) 1988-07-23
JPS63194425A (en) 1988-08-11
FI77131C (en) 1989-01-10
FR2610156A1 (en) 1988-07-29
DE3741866C2 (en) 1997-04-03
GB8729449D0 (en) 1988-02-03
FI870286A0 (en) 1987-01-22
FI77131B (en) 1988-09-30
GB2200270A (en) 1988-07-27
JPH07118680B2 (en) 1995-12-18

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Legal Events

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

Effective date: 19971217