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Chapter 1 Introduction to Land Mobile Radio The mobile wireless communications industry easily ranks as one of the most dynamic and fast-growing— if not the fastest growing—industri es of today . Driving its popularity and growth are the wide variety of services it provides and the tremendous benefits it offers. Around the globe, convenience, improved e fficien cy , and enhanced product ivity ha ve become its trademarks. Conventional Land Mobile Radio (Two-Way) Convent ional systems dedicate a single radio channel to a specific group of users who share it. As such, privac y is limited. It is possible for a company using a channel to be overheard by other users on the same channel. Some of these listeners might even be competitors! Conventional systems, by limiting a group of users to a specif ic channel, also limit the total num- ber of customers who can be served by the system. Moreover , because radios on convent ional systems transmit and recei ve on a single channel, the user must wait if the channel is occupied by another conversat ion. For these reasons, convent ional systems are considered spectrally inef- ficient when compared to trunking systems. Figure 1.1 shows a block diagram of a convention- al land mobile radio system. 1 sb_01r.qxd 4/12/00 8:41 AM Page 1

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