玩具直升机结构
摘 要
无线对讲机作为一种简单的通信工具，由于它不需要中转和地面的交换机站的支持，就可以进行移动通信。目前广泛应用于生产、保安、野外工程等领域的小范围通信工程中。 无线数字对讲机技术是很多无线移动通信技术的基础，目前应用广泛的蜂窝式移动电话技术，就是在无线双工对讲机的基础上，发展起来的新兴现代通信技术。很好的熟悉掌握无线对讲机内部的电路的工作原理和测试、调整技术，对今后从事通信工程领域的技术工作，无疑是十分重要的。 本文主要讲述了无线数字对讲系统的基本原理，本系统主要设计一个基于RDS功能的调频数字对讲机。粉体输送阀
采用嵌入式处理器芯片STC89C52RC控制FM发射芯片METLERTOLEDOQN8027实现立体声的发射，通过PC机发送信息给调频发射芯片QN8027，然后通过QN8027将信息无线发射出去供QN8025接收，并通过液晶显示屏LCD12864显示信息，且通过4*4的矩阵键盘来控制发射机发射的频率和接收机的开关机，完成语音通信。
关键词：自制鱼缸灯架调频发射、调频接收、用户切换、完成语音通信低频放大器
Abstract滚装码头
Interphone is an simple communication equipment. With Wireless Interphone We can complete mobile communication service without the support of the transfer station . Wireless Interphone has been used wildly in the field of production and so on .The technology of frequency division doplex wireless interphone is the base of our modern mobile communication systems . In this thesis ,I build a model for a receiver system of a wireless interphone .And I explain how to chose the frequency of the carrier .how to change the frequency of the signal and how to select the way to enlarge the signal power. In my thesis , the receiver system is based on the technology of superheterodyne .There are 7 parts in this system ,they are: receiving antenna receiving band pass filter..high frequency power amplify.the first frequency mixing circuit the second frequency mixing circuit. low frequency amplify .power surce circuit
The main design based on a RDS function FM transmitter system. Using the embedded processor chip STC89C52RC control FM transmitting chip QN8027 to realize the stereo transmitter, through the PC to send information to the FM chip QN8027, and then the information is transmitted by QN8027 for the receiverQN8025, and display the information through the LCD12864 screen, and through the 4*4 matrix keyboard switch to control the frequency of the transmitter and the receiver.
Key word: FM send、FM accept、user change、finish voice communication
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