Apparatus for providing two-way communication in underground fac

Details Apparatus for providing two-way communication in underground fac Apparatus for providing two-way communication in underground fac

1993-09-17

1994-09-06

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 7, 375 88, 455 19, 455 40, 455 82, 455 83, 343741, H04B 1302, H04B 144

Patent

active

053454731

ABSTRACT:
The invention relates to an apparatus which is desiged for underground use in order to facilitate a two-way communication. The apparatus is operated within the frequency band 0.1-2 MHz, in order to make the electromagnetic waves propagate advantageously by utilizing the metal structures installed in the underground facilities and the bedrock itself. According to the invention, the transmitter/receiver unit is provided with an analog to digital converter (5) and respectively a digital to analog converter (20) in order to transmit the intermediate signal coded in digital form in between the two units of the apparatus.

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patent: 4747158 (1988-05-01), Goldberg et al.
patent: 4777652 (1988-10-01), Stolarczyk
Killen; "Modern Electronic Communication Techniques"; 1985; pp. 516-521.
Albert D. Helfrick, Amateur Radio Equipment Fundamentals Jan. 18, 1982, Prentice-Hall, Inc., p. 80.
Martin S. Roden, Analog and Digital Communication Systems 1985, Prentice-Hall, Inc., p. 367.

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