无线对讲机设计

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  无线对讲机设计

  摘要:无线对讲机具有使用简单、不受网络限制、通话成本低、适用范围广等优点。它是在鉴频、混频等技术的基础上,利用无线电通信原理研发的一种通信方式。目前,人们对对讲机的研究已从模拟化转化为数字化。本文从无线对讲机的基本原理出发,确立了系统的设计方案,将对讲机系统分为发射部分和接收部分两大部分,并对各部分的功能和作用进行了分析和研究。通过对声电转换电路、低频放大电路、混频电路、鉴频电路、天线与同类型电路的对比,最后确定了对讲机电路图。接下来利用Multisim仿真软件对各大模块进行仿真并对仿真信号进行分析。本论文最后对影响对讲机传送距离的因素进行分析,提出了改进意见。

  关键词:无线对讲机;LM386;Multisim

  Design Of Radio

  Walkie-talkies

  Abstract : Walkie-talkie has advantages such as

  easy to use, without network restrictions, low cost communication

  and wide range of application . It is a method of

  communication on the basis of the frequency

  distinguishing and mixing techniques, developed on the radio

  communication principle. Currently, the study of wireless

  interphone has turned from anolog to digital.This thesis starts

  from the wireless walkie-talkie basic principle, to establish the

  system design. And walkie-talkie system is divided into two parts:

  send part and receive part.It analyses and researchs the functions

  and usages of each part. I analyse such circuits:voice of

  conversion circuit, low-frequency amplifier, mixer

  circuit-frequency circuit, antenna,and compare them with similar

  circuits, finaly confirm the whole walkie-talkie circuit. Next,

  using Multisim simulation software to simulate the major modules

  and analysing simulation signals. At last,the thesis analyses the

  factors affecting the talking distance of walkie-talkie,and

  suggests some improvements.

  Keywords:walkie-talkie, LM386,

  Multisim

  目 录

  第1章 绪 论·········· 1

  1.1 无线对讲机的概述··········· 1

  1.2 本文设计的内容··············· 2

  1.3 论文的总体结构··············· 2

  第2章 无线对讲机方案与论证··· 3

  2.1 系统设计思路··················· 3

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