... head-end QAM Modulator 1.Complying DVB standard signal channel coding 2.PCR adjusting, output symbol rate DH-803 CATV digital head ... -end QAM Modulator Description DH-803 QAM Modulator, is the main equipment CATV digital head-end, receiving ... ) -20-80°C(Storage)Power220VAC±10%,50Hz,25W DH-803 CATV digital head-end QAM Modulator