本系统从无线通讯电路的基本组成原理出发，通过对系统各大组成部分的原理、功能及运用的研究，设计制作了一个单工无线通讯电路，能够实现单工语音传输业务，采用FM调制方式，在20MHz~40MHz频段上实现了话筒输入语音信号的小功率远距离单工发送和接收。本电路由系统传送一路发射频率在20MHz~40MHz之间的语音信号，通过芯片LA1800和芯片D2822，声音从发射者这端传送到接收者那端，收发者之间相距30米以上都能收听到。本系统具有功能完备、工作稳定、使用简单、灵敏度高、传输距离远等特点。
关键词：发射模块；接收模块；无线通讯电路；频率
Abstract
The system from the wireless transceiver of the basic principles of the starting composition, through the major components of the system theory, function and use of research and design work produced by a single radio transceiver capable of realizing a single public voice transmission services, using FM modulation , in the 20MHz ~ 40MHz band achieved a microphone input voice signal low-power single-workers to send and receive long-distance. This circuit consists of a system to send all the way firing frequency 20MHz ~ 40MHz between the voice signal through the LA1800 chip and chip D2822, sound from the launch by the end of Cabanatuan sent to the recipient, send and receive more than 30 meters distance between the can listen to . The system has a fully functioning, stable, easy to use, high sensitivity, transmission distance and so on.
Key words: Launch module；receiver module；wireless transceiver；frequency
