前置中频放大器性能的改善

The Improvement of the Property of the Front Medium Frequency Amplifier

通信机中的收信前置中频放大器 ,其性能的高低将直接影响整机技术指标。但其性能很不稳定。通过多次实验 ,证实其原因为 :晶体管选择不合适 ;屏蔽盒尺寸选择不当。

The property of the front medium frequency amplifier influences directly the technical targets of the machine.Yet the property of amplifiers are often unstable.Through many experiments ,two causes were found.One is that the choice of three pole tubes is not reasonable,and another is that the dimension of the protective box is not reasonable.The method improving the property of the front medium frequency amplifier was proposed based on experiments.