DOWN CONVERTER FOR SATELLITE COMMUNICATION SYSTEM

摘要

A down converter device is used in a satellite communication system to convert a microwave signal to an intermediate frequency signal by the use of a standard signal having a frequency range of several to several tens of MHz, and to apply the intermediate frequency signal to a next stage component. The down converter includes a mixer for producing the intermediate frequency signal which is indicative of the frequency difference between the standard signal and the microwave signal. A separator includes a first terminal for receiving the intermediate frequency signal, a second terminal for producing and supplying the intermediate frequency signal to the next stage component and for receiving the standard signal from the next stage component, a first filter for separating the standard signal, and a third terminal for producing the standard signal to the mixing means. The system has the advantage over prior down converters that only a single connection is required between the converter and the next stage component.