摘要：在本次设计中，主要设计的为一款小功率的业余电台收发装置（QRP）该类型装置具有较低功率的发射与接收功率，经过设计验证，接收部分电流为35mA，发射电流为1A以下，为此实现了超低功耗的无线发送与接受功能，并且本次设计的电路具有很高的灵敏度，能够应用于各种短距离发送与接收场合中，本次设计的主要内容为关于无线电台的混频电路、中频放大电路、解调电路以及低通滤波、带通滤波器、以及发射、接收端的功率放大电路的设计，实现了采用接受高频信号，经过NE602混频器混频后输出中频信号，在将中频信号采用中频放大器MC1350进行中频放大，最终采用二级混频器NE602将中频信号中的语言信号进行解调,在这个实现路径之中对信号波形径向滤波出来，之后再通过功率放大器2sc1162对信号进行放大，最终实现能够进行无线通讯。80980

毕业论文关键字: 小功率业余电台；QRP；混频器；中频放大电路；滤波；功率放大

The hardware design of the QRP transceiver

Abstract:In this design, the main design for a small power amateur radio transceiver (QRP) of this type of device with low power transmission and reception power, designed to verify that the receiving part of the current 35mA, the emission current of 1A below , To achieve this ultra-low power wireless transmission and reception functions, and the design of the circuit has a high sensitivity, can be applied to a variety of short-range transmission and reception occasions, the main content of this design for the radio The frequency modulation circuit of the transmitter, the intermediate frequency amplification circuit, the demodulation circuit and the low-pass filter, the band-pass filter, and the power amplifier circuit of the transmitting and receiving ends are realized by adopting the high frequency signal, after mixing the NE602 mixer Output IF signal, the IF signal MC1350 IF IF amplifier amplification, and ultimately the use of secondary mixer NE602 IF signal in the language signal demodulation, in the realization of the path of the signal waveform radial filter out, after the And then through the power amplifier 2sc1162 to amplify the signal, and ultimately to enable wireless communications。

Keywords: Small power amateur station; QRP; mixer; IF amplifier circuit; filter; power amplifier

目录

目录 IV

1。绪论 1

1。1 课题研究背景 1

1。2 QRP简介 1

1。3 国内外发展趋势 2

1。4 课题研究内容及研究目标 3

1。5 本章小结 3

2无线电台通讯的基本原理 4

2。1 无线通讯技术基本原理 4

2。2。 调幅与调幅调制原理 4

2。2。1 调幅信号调制原理 4

2。2。2 调幅信号频谱分布 6

2。3 调频与调频调制原理 6

2。3。1 调频信号调制原理 6

2。3。2调频信号频率分布 8

2。4 混频器的功能及基本原理 8

2。5 滤波器功能及其分类 11

2。5。1滤波器根据处理平台分类 11

2。5。2滤波器根据功能分类