某型接收机-60dB带宽指标超标问题分析和解决方法

Analysis and solution of a certain type of-60dB receiver bandwidth index exceed the standard problem

选择性问题一直是困扰接收机-60d B带宽指标问题的难点。通过分析接收机的设计原理,采取电路排除法,查找到了有效解决接收机-60d B带宽指标超标问题的方法,对电路前端器件75MHz晶体滤波器(该晶体滤波器是保证接收机通频带的重要器件)指标改进适应接收机的使用环境,有效解决了接收机-60d B带宽指标超标问题。

Selective problem has been bothering receiver-60dB bandwidth index the problem.Through the analysis of the design principle of receiver,using the circuit method,to find the effective to solve the problems of the receiver -60dB bandwidth indicators exceed bid method,the front end circuit device 75MHz crystal filter (the crystal filter is one of the important device ensure receiver passband ) index improved to adapt to the receiver using environment,effectively solve the receiver -60dB bandwidth index to exceed bid.