提高现代晶体管化通讯接收机的抗干扰性能,若干年来都是通讯设备研究的重要课题。一部优质接收机,除了看其小信号灵敏度之外,更为强调其抗干扰性能。存在大量高电平干扰信号的实际情况下,仅仅讲传统的单信号选择性是不够的,更应注意动态选择性(多信号选择性)。近年来再三强调交调、互调、大信号阻塞、倒易混频等对接收机多信号特性的影 Improve the anti-jamming performance of modern transistor-based communications receiver, communication equipment for many years are an important issue. A high-quality receiver, in addition to its small signal sensitivity, more emphasis on its anti-jamming performance. In the real world where a large number of high-level interference signals exist, it is not enough just to talk about the conventional single signal selectivity, and more attention should be paid to dynamic selectivity (multi-signal selectivity). In recent years, repeatedly emphasizing the intermodulation, intermodulation, large signal blocking, easy mixing and so on the receiver multi-signal characteristics