文档介绍：编号:
高频电路设计与制作
实训(论文) 说明书
题目: 卫星接收与对讲机组装调试
院(系): 应用科技学院
专业: 电子信息工程
学生姓名:
学号:
指导教师:
2011年 1月20日
摘要
卫星电视接收系统又称为卫星电视接收站。卫星接收系统的组成包括水平极化和垂直极化两个部分,这两部分的结构是完全一样的。卫星接收系统可以分成室外和室内两部分:室外部分包括了卫星接收天线、高频头、第一中频电缆,有时还设有线路放大器;室内部分包括了功分器、数字卫星接收机。作为集体接收系统来说,卫星接收机的输出就是有线电视的信号源,所以它直接与射频调制器连接;在个体接收时,卫星接收机则直接与用户的电视机相连接。
卫星通信和调频广播是无线电技术的两个常见的应用。卫星通信简单地说就是地球上的无线电通信站间利用卫星作为中继而进行的通信。卫星通信的特点是:通信范围大;可靠性高;开通电路迅速;多址通信;多址联接。调频广播是高频振荡频率随音频信号幅度而变化的广播技术,以调频方式进行音频信号传输的,调频波的载波随着音频调制信号的变化而在载波中心频率两边变化,每秒钟的频偏变化次数和音频信号的调制频率一致,具有抗干扰力强,失真小,设备利用率高等优点。
本仿手机调频收音机、对讲机收音用D1800做为收音集成电路,功放选用D2822,对讲的发射部分采用两级放大电路,第一级为振荡兼放大电路;第二级为发射部分,采用专用的发射管使发射效率和对讲距离大大提高。
关键词:卫星电视接收系统;卫星通信;调频广播;对讲机;D1800;D2822
Abstract
Satellite television receiving system for satellite tv ground station. the satellite receiving system, including the horizontal and vertical of anomalies due to polarization two parts, the two parts of the structure is exactly the same. Satellite receiving system can be divided into two parts :The outdoor part of the satellite includong Included receiving aerial and satellite tv tuner, and sometimes a line of an interior part including the merits, the satellite receiving. As a receiving system for collective, satellite receiving output is the cable tv signals to the source, It directly related to radio frequency modulation is connected ;In individual receives, the satellite receiving directly connected with the tv set.
munications and FM radio is the radio technology of the mon applications. munications is the use of artificial earth satellite as a relay station to transmit radio waves and carried out by two or munication between earth stations. munications is: Range big ; high reliability ; open the circuit ; more munications ; more connected their premises to be addressed. FM radio is a high-frequency oscillation frequency with the audio signal amplitude and changes in broadcasting technology, the way to FM audio signal transmission, FM carrier wave modulation with the audio si