FM exciter

例句：

1. 1.The FM exciter is used to transmit radio signals over long distances.
   FM发射机用于远距离传输无线电信号。
2. 2. The FM exciter was designed to improve the quality of audio signals.
   FM激发器被设计用来提高音频信号的质量。
3. 3. The FM exciter was used to test the reliability of the communication system.
   FM激发器被用来测试通信系统的可靠性。