对讲机的用途很广泛，发送原理是把音频信号转换成电信号,再通过调制之后利用特定的频率范围发送出去。

接收是利用接收器对特定的频率范围之内收到的信号通过解调之后通过扬音器发出收到的信息声音

-Radio is so widely used, principle is to send the audio signals into electrical signals, then through the modulation after the use of a particular frequency range to send out. Is to use the receiver to receive a specific frequency within the signal received by demodulation after the sound emitted by Yang received the voice message