Detailed Description  QPSK to QAM modulator QPSK to QAM modulator is a headend equipment with the professional broadcasting quality according to DVB standard . Its main function is to directly convert twin signals which could be QPSK modulated from satellite or other program source to twin QAM signals and then transmit via HFC or MMDS network. It doesn't need decompression, compression, QAM modulation, but directly modulate data stream demodulated to QAM signal sending to HFC or MMDS network. Therefore, it carries out SDTV/HDTV services and so on, providing many digital TV programs and data broadcasting programs with low-cost in SMATV. Features: · Up to DVB standard, DVB/MPEG-2 compatible · SCPC/MCPC compatible, receiving unencrypted digital satellite programs at home and abroad.Viterbi auto-identify · Low gateway Integration tuner, reliable and good performance · 188/204 packet auto identify · Work at mode QPSK16QAM32QAM64QAM128QAM256QAM · Output data bit rate:256Mbps · Output signal BW 1.158.05MHz(Fall 0.15) · Output data symbol ratio17Mbaud/s · IF output frequency range: · GQ-3691, 35.25/36/36.15/44MHz · GQ-3693, 36 MHz36+68MHz  · IF output level98+/- 1dBuV · RF frequency range48860MHz(subsection offer) · RF output level100dBuV115dBuV(stepping optional) · GQ-3693 double input and double RF output · QPSK loop output interface · Error alarming · RF testing output interface · LCD display · Network controlled interfaceNMS optional · Power off memory  Chengdu Jie xun electronics Co,.LTD