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Specialized Mobile Radio

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DEFINITION: Also see Enhanced Specialized Mobile Radio (ESMR).Specialized Mobile Radio (SMR) is any two-way radio system in which two or more mobile/portable wireless transceivers are linked by a single repeater. The repeater is elevated above average terrain; this maximizes the area of coverage. Operating frequencies are in the VHF (very-high-frequency) or UHF (ultra-high-frequency) range, that is, between approximately  … 
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SPECIALIZED MOBILE RADIO DEFINITION (continued): …  30 MHz and 3 GHz.In some ways, an SMR system is like a cellular telephone network. But there are important differences. An SMR system is simpler than a cellular telephone network. There is only one repeater in a SMR system, and it links only the mobile/portable units for that system, not to other repeaters. In SMR, the range of each individual mobile/portable transceiver is greater than the range of a cell phone set. But total system coverage is usually far more limited than that of a cellular network, because there is no linking among repeaters.SMR systems use channel pairs. Each transceiver … 
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