近年来随国内干线微波通信线路的广泛建设,作为分支线路,对于容量较小(24路左右)的无线电线路的需要量不断增加。这种小容量线路以前是采用400MHz频段的无线系统来实现的,由于线路需要的增加,400MHz频段已相当拥挤,难以再建设新的线路。为此,代 In recent years, with the extensive construction of domestic trunk microwave communication lines, the demand for radio circuits of smaller capacity (about 24 roads) is increasing as a branch line. This small-capacity line was previously implemented using a 400MHz band wireless system. Due to the increased line requirements, the 400MHz band is already quite crowded, making it difficult to build new lines. To this end, on behalf of