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在收音机出现的故障中,啸叫是最常见的一种。所谓啸叫,是指在正常播音的同时,还从扬声器里发出“吱吱”声、“唧唧咕咕”声、“卟卟”声和“沙沙”声等。啸叫产生的原因较复杂,但主要是机内寄生振荡造成的,在分析原因时,首先检查电池的电量是否足,如果电池电压不足会出现“卟卟”的汽船啸叫。另外查电源的去耦电容是否失效,如果不是这些原因,那便可以从电路中的高频、中频、低频三部分入手。下面分别加以分析。
Howling is the most common type of radio malfunction. The so-called whistle, refers to the normal broadcast at the same time, but also from the speaker issued a “creak” sound, “jack coo” sound, “porphyrin” sound and “rustling” sound. Whistling causes more complicated, but mainly caused by parasitic oscillations in the machine, when analyzing the reasons, first check the battery power is enough, if the battery voltage will appear “porphyrin porphyrinic” steamship whistling. In addition, check whether the decoupling capacitor power failure, if not for these reasons, it can be from the circuit of high-frequency, intermediate frequency, low-frequency start with three parts. The following were analyzed.