模拟式频率引导采用经典的晶体滤波器组，其数量大、成本高、重量体积大。
Analogue frequency leading USES classic crystal filter group, it has many shorts, such as a great deal components, high cost and large bulk.
模拟式频率引导采用经典的晶体滤波器组，其数量大、成本高、重量体积大。
Analogue frequency leading USES classic crystal filter group, it has many shorts, such as a great deal components, high cost and large bulk.
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