A set of the low power wireless transmitting and receiving system is designed by using the MSP430G2553 SCM as the control core ,and the complete system scheme and detailed calculation process of transmitting power are presented .The software control is introduced at the receiver ,and the functions of the manual searching and automatic searching are realized ,which can be used either as an individual FM receiver or as a whole integrated transmitting and receiving system . The system is rich in knowledge points and comprehensive ,covering the voltage controlled oscillation ,frequency modulation ,frequency demodulation , radio frequency power amplification ,low frequency power amplification ,MSP430 SCM ,etc .The system adopts the modular design which is of low cost and strong interest .It helps the students to understand the relevant theoretical knowledge and is suitable for promotion in experimental teaching .%以MSP430G2553单片机为控制核心,设计了一套小功率无线发射接收系统,给出了完整的系统方案和详细的发射功率计算过程.在接收端引入软件控制,实现了手动搜台和自动搜台等功能,既可以作为调频接收机单独使用,也可以作为发射/接收系统整体使用.系统涉及到的知识点丰富、综合性强,涵盖了压控振荡、频率调制、频率解调、射频功放、低频功放和M S P430单片机等内容.系统采用模块化设计,成本低廉、趣味性强,有助于学生深入理解相关理论知识,适合在实验教学中推广.
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