七管超外差调幅收音机li..doc

学校代码 10126 学号 本科学年论文 题 目 超外差式七管调幅收音机 院 系 内蒙古大学鄂尔多斯学院 专业名称 电子信息科学与技术 年 级 2011 级 学生姓名 李永明 指导教师 白晓磊 2013年07月16日 七管超外差调幅收音机 摘要 目前应用最广的两种发送接收方式调频与调幅，随着社会发展调频方式成为现代设备的工作方式。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 Seven tube specialized superheterodyne an am radio Author:Autor: Bai Xiao Lei abstract In life, everywhere we work with wireless communication, such as wifi, now TV is closely related to wireless communications, and wireless communication is mainly composed of transmitting and receiving devices. Which two of the most widely used way to send and receive is frequency modulation and amplitude modulation, frequency modulation way along with the social development will become the main way of working of modern equipment. Superheterodyne radio, from a weak high-frequency antenna received signals v1 first level after level 1 or several high frequency small signal amplifier amplification for v2. Then sent to the mixer and the local oscillator continuous oscillation voltage generated by the mixed v3, v4 output voltage generated by envelope shape remains unchanged, still with the original signal waveform is similar, but the carrier frequency is changed for v2 and v3 of the difference of the two high frequency (or close). This is called intermediate frequency. Intermediate frequency voltage v4 after intermediate frequency amplifier v5, send one detector, detector output voltage v6. Finally v6 in intermediate frequency amplifier amplification process for v7, sent to the speakers converted into sound signal. Specialized superheterodyne receivers can greatly improve the receiver of the gain, sensitive and selective. key words : Specialized superheterodyne, welding, commissioning, FM 目 录 1 实训目的 1 2 工作原理 2 3 实训内容 3 3.1实习器材 3 3.2 元件说明 3 3.3安装顺序 3 3.4收音机的组装 4 3.5收音机的调试 4 3.