... RF output; 3.support QPSK,16QAM,32QAM,64QAM,128QAM and 256QAM 4.FEC fuifill DVB-C QAM-4 QAM Modulator is mainly used in ... data processing, the four-way TS, without multiplexing, are transferred to QAM Modulator, and are processed with intermediate frequency (four adjacent frequency with ...