摘要
论述了增加频带宽度可以改善调频接收机的输出信噪比，但不能无限制增加带宽去换取高的信噪比，否则会引起“门限效应”
Increasing bandwidth can improve output signal to noise of WBFM,but,connot unlimitedly increase bandwidth,to get signal to noise of high frequency.Otherwise it will cause threshold.
关键词
门限效应
调频接收机
信噪比
接收机
threshold
spike noise
bandwidth
spike noise causing threshold
