基于原有的SIM300 GPRS模块和移动公司的MAS设备，研发USB接口的无线调制解调器。
This system uses a wireless modem with USB port based on SIM300 GPRS module and the MAS device of China Mobile.
通过对TC 35i模块的应用程序接口的分析，设计出它的外围电路，从而实现一个可以进行移动短消息收发的设备。
By analyzing the application program interface of TC35I wireless module, the peripheral circuit is designed. Through the device we can receive or send short messages.
所述发射设备，用于从接口模块接 收数据，并将收到的数据处理为射频RF信号后进行发射。
The transmitting device is in use for receiving data from the interface module, and transmits the RF signal processed from the received data.
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