×

Long range multiple point wireless control and monitoring system

  • US 5,087,099 A
  • Filed: 08/16/1990
  • Issued: 02/11/1992
  • Est. Priority Date: 09/02/1988
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method of mine wide data transmission which comprises:

  • inductively coupling a plurality of first repeaters to an electrical conductor running from a surface area to a mine;

    inductively coupling a plurality of second repeaters to said electrical conductor;

    transmitting a data signal from a base station at a frequency F2 to one of the first repeaters, said data signal comprising a digitally encoded word;

    retransmitting the data signal from one of the first repeaters at a frequency F3 to one of the second repeaters;

    retransmitting the data signal from one of the second repeaters at a frequency F1 to a remote monitoring and control unit;

    decoding the digitally encoded word in the remote monitoring and control unit; and

    checking an address characteristic of the digitally encoded word before accepting the digitally encoded word.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×