The CS500 XD series operates in the 902–928 MHz radio band. The voice transition method used is digitization, with 32 kb ADPCM vocoding, and encryption of the vocoded data, which is then formatted into TDMA and PS key modulation. The transmitter operates at a low-duty cycle in non-constant envelope mode. The frequency band complies with North American regulatory requirements. Read this paper to learn more.
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