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- W2125642558 abstract "An underground coal mine medium frequency (MF) communication system generally couples its electromagnetic signals to a long conductor in a tunnel, which acts as a transmission line, and exchanges signals with transceivers along the line. The propagation characteristics of the transmission line, which is usually the longest signal path for an MF communication system, play a major role in determining the system performance. To measure the MF propagation characteristics of transmission lines in coal mine tunnels, a method was developed based on a basic transmission line model. The method will be presented in this paper along with the propagation measurements on a transmission line system in a coal mine using the method. The measurements conflrmed a low MF signal power loss rate, and showed the in∞uence of the electrical properties of surrounding coal and rock on the MF propagation characteristics of the line." @default.
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- W2125642558 date "2013-01-01" @default.
- W2125642558 modified "2023-09-27" @default.
- W2125642558 title "AN INTRODUCTION TO A MEDIUM FREQUENCY PROPAGATION CHARACTERISTIC MEASUREMENT METHOD OF A TRANSMISSION LINE IN UNDERGROUND COAL MINES" @default.
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- W2125642558 doi "https://doi.org/10.2528/pierb13073006" @default.
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