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张海舟:本振和拍频频率已测量出了,本振调到的11.055MHz了,拍频也调到了3.999MHz左右了,为什么收到的还是杂乱的电台声?另外在4个晶振中间加了27P47P27P的电容为什么信号声变得很小了? (2017-01-22 17:42)
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BG2WAH:你的滤波器是4MHz,如果接收7MHz中频=11.0550-7.0000=4.0550MHzLSB本振=4.0550+0.0015=4.0565MHz(你的是3.9990MHz)零差频=11.0550-3.9990=7.0560MHz (2017-01-22 20:48)