许多干扰题问都是由发射机附近接收机的前面几级过载而造成的。设置或频率分配是系统设计中最主要的问题。下面将简要地描述必须采取的几项措施。1.问题在目前使用的接收机中,选择性主要是由使用“组件”或晶体滤波器的中频放大级决定的。在中频放大器前的各级,由于工作于 VHF 或 UHF 的调谐电路和在一个有限的频段上要求 Many interference problems are caused by the first few stages of overload in the receiver near the transmitter. Setting or frequency allocation is the most important issue in system design. In the following we will briefly describe several measures that must be taken. 1. Problem In the currently used receivers, the selectivity is mainly determined by the IF amplification stage using “components” or crystal filters. At all levels before the IF amplifier, due to the tuning circuit operating in VHF or UHF and required on a limited frequency band