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• Station Locations: FI%c seismometer stations cirre deployed as ;hewn in the ti?urc. <br />?J <br />"fir \ .• /,i ? <br />'Y N <br />.. <br />-7 A <br />\ LF1 , rf F G H <br />l1 1\( <br />WTM T main <br />repeater <br />l <br />l' BWK <br />yrww t • a ? O <br />_ ? • It \ 3a. 1?- <br />' central i?•" <br />?I ? l 1'? \_ _ ? site •s ,r i } <br />Radio telemetry: The remote data acquisition (K2) systems output continuous seismic <br />waveform data in serial (RS-232) data streams. These data streams are telemetered back to a <br />central recording site at the mine using 900 MHz license-free spread-spectrum radios (Intuicom) <br />via two radio repeaters. Radios are operated in a bandwidth-sharing time division multiple <br />access (TDMA) mode. Master radios at the central recording site feed into a WiGate server that <br />makes seismic data from individual stations available over TCP/IP sockets. <br />Remote Power Source: Two 75-watt photovoltaic panels and four 115 Amp-hr batteries at each <br />remote site. One 75-watt panel and two 115 Ali batteries at each repeater site. <br />Station/Battery Vaults: Corrugated steel pipe, oriented vertically and set into ground. 2-ft long, <br />30-inch diameter. Separate insulated vaults for instrumentation and batteries. Hole in sensor <br />vault is dug down to bedrock. A flat concrete floor is poured, onto which the strong-motion <br />seismometer is bolted. <br />? 4P