A frequency modulation (FM) transmitter adds a low-frequency audio tone, inaudible to the human ear, to the transmitted voice signal to open the receiver's squelch. The common term for this technology is CTCSS (Continuous Tone-Coded Squelch System).
调频发射机在发射的语音信号上附加一个人耳听不到的低频音频，用来打开接收机的静噪。这一技术的常用名词是CTCSS。
| 正面 | LK1099 调频发射机在发射的语音信号上附加一个人耳听不到的低频音频，用来打开接收机的静噪。这一技术的常用名词是： |
|---|---|
| 背面 | CTCSS |
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