modulation coil

例句：

1. 1.The modulation coil in the receiver is responsible for adjusting the signal strength.
   接收机中的调制线圈负责调整信号强度。
2. 2.The engineer used a special modulation coil to improve the signal quality.
   工程师使用了一种特殊的调制线圈来提高信号质量。
3. 3. In radio engineering, the modulation coil plays a crucial role in frequency modulation.
   在无线电工程中，调制线圈在频率调制中起着关键作用。