摘要:在现代通信中，对讲机是一种近距离的、简单的、比较实用的无线通信工具，由于它不需要中转站和地面交换机站支持，就可以进行有效的移动通信，因此深受人们的欢迎。目前，它广泛应用于生产、保安、野外工程等领域的小范围移动通信工程中。调频对讲机是通过调节频率使一组对讲机的接收频率和发射频率与另一组对讲机的发射频率和接收频率相同，从而实现对讲功能的无线通信工具。
本单工无线调频对讲机，以集成芯片D1800、D2822为核心，主要由FM接收机电路、FM调频发射电路、输入输出回路、高频功率放大电路、混频电路、选频电路、鉴频电路、本振电路、静噪电路、音频功率放大电路、缓冲放大电路、信号转换电路等模块组成。基于题目要求，本系统在50～100米范围内能够发射和接收相同频率信号，可自动在接受和发射间转换。对部分电路进行了仿真，能够达到预期指标。设计中采用了模块化的思想，使得设计思路非常清晰。
关键词：对讲机；调频；无线；单工
ABSTRACT:In the modern communication,radio is a close,simple,practical wireless communication tools,because it does not need to station and the ground switch stand support,can effectively mobile communication,and so our the welcome of people.At present,it is widely used in production,the security,the wild areas such as engineering small areas of the mobile communication engineering.FM radio by adjusting the frequency that is a group of radio receive frequency and launch frequency and another group of radio frequency and receive frequency the launch of the same,so as to realize the function of the wireless communication tools intercom.
The wireless FM radio transitions and the integrated chip D1800,D2822 as the core,and the main FM receiver circuits,FM radio emission circuit,input/output circuit,the high frequency power amplifier circuit,frequency mixing circuit,frequency selective circuit,popularly used circuit,the local oscillator circuit,static noise circuit,audio power amplifier circuit,buffer amplifier circuit,signal circuit module.Based on the topic request,this system in 50~100 m range can transmit and receive the same frequency signal,it can automatic in accept and switching between launch.For part of the circuit simulation,and can achieve the expected indicators.Design using modular thought,make design ideas very clearly.
Key words :Radio; FM; Wireless; Simplex
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