为了使得射频源和波导管的频率保持一致，采用了自动频率控制系统(afc)。
In order to make the RF source and the waveguide have the same resonant frequency, the automatic frequency control (AFC) system is used.
为了使得射频源和波导管的频率保持一致 ，采用了自动频率控制系统 （AFC）。
This paper introduces an AFC algorithm for a zero-intermediate frequency direct-sequence spread spectrum digital receiver.
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