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GB1248223A - Radio frequency communication systems - Google Patents

Radio frequency communication systems

Info

Publication number
GB1248223A
GB1248223A GB8226/68A GB822668A GB1248223A GB 1248223 A GB1248223 A GB 1248223A GB 8226/68 A GB8226/68 A GB 8226/68A GB 822668 A GB822668 A GB 822668A GB 1248223 A GB1248223 A GB 1248223A
Authority
GB
United Kingdom
Prior art keywords
radio frequency
communication systems
frequency communication
amplitude modulation
speech
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
GB8226/68A
Inventor
David James Reginald Martin
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.)
Coal Industry Patents Ltd
Original Assignee
Coal Industry Patents 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 Coal Industry Patents Ltd filed Critical Coal Industry Patents Ltd
Publication of GB1248223A publication Critical patent/GB1248223A/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
    • H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
    • H04B5/48—Transceivers

Landscapes

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

Abstract

1,248,223. Radio signalling. COAL INDUSTRY (PATENTS) Ltd. 16 May, 1969 [20 Feb., 1968 (3)], Nos. 8224/68, 8225/68 and 8226/68. Heading H4L. The system disclosed in Specification 1,248,222 is modified in that the speech signals are transmitted along the line by amplitude modulation in both directions or by amplitude modulation in one direction and at speech frequency in the other direction.
GB8226/68A 1968-02-20 1968-02-20 Radio frequency communication systems Expired GB1248223A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB822468 1968-02-20

Publications (1)

Publication Number Publication Date
GB1248223A true GB1248223A (en) 1971-09-29

Family

ID=9848336

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8226/68A Expired GB1248223A (en) 1968-02-20 1968-02-20 Radio frequency communication systems

Country Status (1)

Country Link
GB (1) GB1248223A (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
US5669065A (en) * 1994-09-15 1997-09-16 Mine Radio Systems Inc. Completely redundant communication system utilizing radiating transmission line
US5697067A (en) * 1994-09-15 1997-12-09 Mine Radio Systems Inc. Communication system utilizing radiating transmission line

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
US5669065A (en) * 1994-09-15 1997-09-16 Mine Radio Systems Inc. Completely redundant communication system utilizing radiating transmission line
US5697067A (en) * 1994-09-15 1997-12-09 Mine Radio Systems Inc. Communication system utilizing radiating transmission line

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