RF preselector

例句：

1. 1. The RF preselector is used to filter out unwanted signals before they reach the main processor.
   射频预选器用于在信号到达主处理器之前过滤掉不需要的信号。
2. 2. In this application, the RF preselector is responsible for selecting the most suitable channel for communication.
   在这个应用中，射频预选器负责选择最适合通信的频道。
3. 3. The RF preselector ensures that only the desired frequencies are transmitted, reducing interference and improving signal quality.
   射频预选器确保只传输所需的频率，减少干扰并提高信号质量。