frequency-marker oscillator

例句：

1. 1.The FMO is used to modulate the frequency of an RF signal for communication purposes.
   FMO用于调制射频信号的频率，以进行通信目的。
2. 2.The FMG is used in radar systems to generate signals that can be detected by other radars.
   FMG在雷达系统中用于生成可以被其他雷达检测到的信号。
3. 3. The FMA is used in wireless communication systems to amplify and filter the received signals.
   FMA用于无线通信系统中，用于放大和过滤接收到的信号。