七管超外差调幅收音机、、.doc

七管超外差调幅收音机
摘要
无线通信在现在的生活中尤为重要，我们常用的手机，无线电话还有各种电器的遥控器等，都离不开发射和接收设备。调频与调幅是目前应用最广的两种发送接收方式，随着社会发展调频方式越来越成为现代设备的必要工作方式。
所谓超外差，是指将所要接收的电台在调谐电路里调好以后，经过电路本身的作用，就变成另外一个预先确定好的频率，然后再进行放大和检波。这个固定的频率，是由差频的作用产生的。在超外差式调频接收机的设计过程中，应将其分为高频放大、混频、本振、中放、鉴频、低频放大六个部分。但是在设计时必须全面考虑，妥善处理一些相互牵制的矛盾，特别要抓住主要矛盾（稳定性、选择性、失真等），才能使得接收机有较好的指标。超外差式接收机能够大大提高接收机的增益、灵敏度和选择性。

关键词：超外差，焊接，调试，调频

Seventubespecializedsuperheterodyneanamradio
Author:Tongwenjing
Autor:Baixiaolei
abstract
wirelesscommunicationsinthelifenowisespeciallyimportant,weusedtousemobilephone,wirelessphonethereareallkindsofelectricremotecontrols,etc,isinseparablefromthesendingandreceivingequipment.FMandmodulationiscurrentlythemostwidelyusedtwosendreceivingmode,alongwiththesocialdevelopmenthasbecomeamoreandmoremodernequipmentFMwaythenecessarywaytowork.
Theso-calledspecializedsuperheterodyne,itistopointtowillhavetoreceiveradiotunedcircuitintheadjustedthelater,overtheroleofthecircuititself,theybecomeanotherapredeterminedfrequency,andthenamplifiedanddetection.Thefixedfrequency,isbythedifferencefrequencyroleofgeneration.InthedesignofthespecializedsuperheterodynereceiversinFMprocess,shouldbeclassifiedintothehighfrequencyamplifier,frequencymixing,thevibration,putting,popularlyused,lowfrequencyamplifiersixparts.Butinthedesignmustbefullyconsidered,properlydealwithsomemutualcontaincontradiction,specialtocatchthemaincontradiction(stability,selectivity,distortion,etc),tomakeagoodindexreceiver.Specializedsuperheterodynereceiverscangreatlyimprovethereceiverofthegain,sensitiveandselective.

keywords:Specializedsuperheterodyne,welding,commissioning,FM

目录
TOC\o"1-3"\h\uHYPERLINK\l_Toc302081实训目的 PAGEREF_Toc302081
HYPERLINK\l_Toc72702工作原理 PAGEREF_Toc72702
HYPERLINK\l_Toc27983实训内容 PAGEREF_Toc27983
HYPERLINK\l_Toc212733.1实习器材 PAGEREF_Toc212733
HYPERLINK\l_Toc216293.2元件说明 PAGEREF_Toc216293
HYPERLINK\l_Toc171693.3安装顺序 PAGEREF_Toc171693
HYPERLINK\l_Toc240063.4收音机的组装 PAGEREF_Toc240064
HYPERLINK\l_Toc241363.