Design And Implementation Of 400W Short Wave Communication System

The 400 W short wave communication system(The following is called this system for short)is a part of the serious of shortwave radio. This system combine the usage of active adaptive HF station with the needs of Communications Security in the troops, and the design follows integrated information transmission system, which derived and developed based on primary shortwave Digital anti interfere radio. It is mainly used in shortwave communication for medium and long distance, and supports the transmission of voice, message, fax and data.On the basis of software radio, this system is made up of comprehensive communication hardware system, exciters element, power amplifier element, power supply unit, antenna tuner and so on. Integrated communication hardware platform is the heart of this system. Digital baseband signals and control signals are transferred to exciters element through optical fiber. Exciters element up-converse and Amplification transform Digital baseband signals from Integrated communication hardware platform, and produce constant amplitude Radio frequency excitation signal, and send this signal to the relative power level’s power amplifier, finishing transformation of transmitting control signal.The signal is used to control filter, Antenna tuner and power amplifier.