高频电子线路课后习题答案曾兴雯4181

高频电子线路习题集第一章绪论1－1画出无线通信收发信机的原理框图，并说出各部分的功用。答：话筒音频输率出放功大调振制器变频器激励放大放大器载波荡器天线开关扬声器音频中频放滤大解调器混频器器高频放大放大器与波本地振荡上图是一个语音无线电广播通信系统的基本组成框图，它由发射部分、接收部分以及无线信道三大部分组成。发射部分由话筒、音频放大器、调制器、变频器（不一定必须）成。、功率放大器和发射天线组低频音频信号经放大后，首先进行调制后变成一个高频已调波，然后可通过变频，达到所需的发射频率，经高频功率放大后，由天线发射出去。接收设备由接收天线、高频小信号放大器、混频器、中频放大器、解调器、音频放大器、经放大后，扬声器等组成。由天线接收来的信号，再经过混频器，变成一中频已调波，然后检波，恢复出原来的信息，经低频功放放大后，驱动扬声器。121213AMDSBSSBVSSB1

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