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移动通信近年发展迅速.最典型的技术是采用中大规模集成电路的可编程频率合成器,专用的通信 IC.移动通信由大区制向小区制发展,使得有限的无线电频段内能够容纳下更多的信道.在户外移动的用户与市活,以及各移动者之间的联系,已经采用移动通信的方法,得以实现.本机是采用152MHz 单一频率发射、接收半双工机.通过简单的 PTT 键(Press totalk),进行通话者之间的方便联系.设计的最优先思想是:采用 PLL 解调,理论上比普通
Mobile communication has developed rapidly in recent years, and the most typical technique is to use a large-scale integrated circuit programmable frequency synthesizer, a dedicated communication IC, which is developed from a community-based system to a community system that enables a limited number of radio bands to accommodate even more Many channels.Outdoor mobile users and the city, as well as the contact between the movers, has been using mobile communication methods to achieve this machine is a single frequency of 152MHz transmitter, receiving half-duplex machine through a simple PTT button (Press totalk), convenient communication between callers.Design of the first idea is: the use of PLL demodulation, in theory, than the average