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随着通信业的发展,BP机的普及率越来越高,同时也给修理业增加了一个新内容——BP机的修理。BP机用户反映最多的问题是收不到CALL,这是BP机灵敏度低的表现。灵敏度低不仅表现为在服务范围内接收不到信号,还会出现接收到的信息符号显示错乱等现象。首先,我们要对BP机的接收有所了解。BP机的接收电路形式与一般超外差式接收机是一样的,其电路形式如附图所示。
With the development of the communication industry, the penetration rate of BP machines is getting higher and higher, at the same time it also adds a new content to the repair industry - the repair of the BP machine. BP machine users reflect the most problems can not receive CALL, which is the performance of BP machine low sensitivity. Low sensitivity is not only manifested in the service range can not receive the signal, but also appear to receive the message symbol display disorder and so on. First of all, we have to understand the reception of the BP machine. The receiving circuit form of BP machine is the same as general superheterodyne receiver, the circuit form is shown in the figure.