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有些寻呼机使用一段时间后普遍存在一个问题就是接收灵敏度低,灵敏度为什么会变低呢?我们先来分析一下信号接收原理。寻呼机的基本工作流程如下: 接收信号经“天线谐振→高频放大→带通滤波→第一变频→高频滤波→第一中放→第二变频→455 kHz→中频滤波→第二中放→限幅鉴频”,完成信号接收处理过
Some pagers use a period of time after the widespread existence of a problem that the receiver sensitivity is low, the sensitivity of why it becomes low? Let us first analyze the principle of signal reception. Pager basic workflow is as follows: The received signal by the “antenna resonance → high-frequency amplification → bandpass filter → the first frequency → high-frequency filter → the first release → the second frequency → 455 kHz → IF filter → the second release → Limitation frequency detection ”to complete the signal received and processed