Underground communication method and substantially safe current limitter circuit |
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| 申请号 | JP13048688 | 申请日 | 1988-05-30 | 公开(公告)号 | JPH01125129A | 公开(公告)日 | 1989-05-17 |
| 申请人 | Stolar Inc; | 发明人 | RARII JII SUTORACHIIKU; KURUTO EI SUMOOKAA; JIERARUDO JIEI BOASU; UIRIAMU II MONTO; MAABUIN ERU HAAZENATSUKU JIYUN; JIEEMUZU ERU ZATSUPANCHI; SESU EI SUMISU; EDOWAADO DEI MUUA; | ||||
| 摘要 | PURPOSE: To make it possible to transmit an MF radio signal up to a ground base station over a long distance by using repeaters to be double transceivers rigidly connected to existing conductors in a mine. CONSTITUTION: An underground communication equipment includes a portable radio equipment 22, a portable radio equipment 26, a pager 27, a mobile radio equipment 24, and a ground base station 30 and all of them are connected by a backbone network for the repeaters 28, 29. Messages sent from respective radio equipments 22, 24, 26 in the communication equipment are respectively received by the repeaters 28, 29, each received message is amplified by the repeaters 28, 29 and transmitted up to the ground station 30 by two different kinds of frequency bands over a long distance up to other radio equipments 22, 24, 26 in the communication system. The radio equipments 22, 24, 26, the pagers 27, and the repeaters 28, 29 are respectively provided with substantially safe current limiter circuits. Thus the underground communication equipment capable of executing mutual communication among plural radio equipments 22, 24, 26, the repeaters 28, 29 and the base station 30 by using intermediate radio signals. COPYRIGHT: (C)1989,JPO |
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