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field. <br />Augmenting the dispatcher's receiving capability was investigated. It is <br />possible to use several additional receivers in a 'voting system ". The additional <br />receivers are located so that they provide improved coverage of problem areas. <br />The audio from these receivers is routed through a comparator circuit which <br />automatically senses and selects the receiver with the 'best signal ". This is done <br />by comparing the noise levels. Thus, the portable radio transmitting in the field <br />has the opportunity to be in a good location for transmitting back to each of <br />several receivers. The dispatcher has the option of manual override of the <br />comparator circuit from his console position. <br />Numerous sites for voting receivers were investigated, some of which <br />were outside Orange County. Potential sites were selected and evaluated using <br />computer -based coverage studies. These studies were verified with field <br />observations. Various volunteer firemen from throughout Orange County also <br />confirmed that the coverage maps matched their experience with the radio <br />coverage on the fire frequency. <br />The three sites which are recommended for consideration are the White <br />Cross VFD, Cedar Grove #2 VFD, and Glen Lennox FD (Chapel Hill). A <br />second Radio Coverage Map is attached which indicates the predicted receiver <br />coverage from an antenna mounted with its center of radiation at 175 feet on a <br />tower at each of these fire stations. Shaded areas have the same meaning as <br />the previous map. The two maps show that adding three voting receivers to the <br />current receiving capability at Eno Mountain will provide coverage of portable <br />radios and solid coverage of mobile radios throughout the entire County. <br />' 3 <br />� <br />WPROJECTS <br />corporation <br />