750Mhz Professional Fixed Channel Modulator Introduction This modulator is high performance headend equipment launched by our company. It is mainly used for djacent modulation of video and audio signals. With advanced IF PLL technology, it enjoys excellent vestigial sideband characteristic and good out band attenuation. It is the first choice product for medium-sized CATV headend equipments. Features With IF modulation technology and CPU controlled PLL technology, frequency stability is high.Selected with high performance SAW filter,and cooperated with spiral band pass filter, it enjoys good out band attenuation. With built-in independent RF power amplifier, output level is up to 110dB and more.Video modulation depth, audio deviation, A/V ratio and output level are all adjustable on front panel. With channel number display on front panel, and added serial power supply ports on back plate, it is easier to operate. Specifications Item Unit Specifications RF Output Frequency MHz 48.25~750 Max Output Level dB 113 V/A Carrier Power Ratio dB 10~30 Spurious Rejection dB 60 Freq Accuracy KHz ≤5 Video Video Mod Depth % 87.5 Freq Response Within dB ≤2 Differential Gain % ≤5 Differential Phase ?≤5 C/L Delay ns ≤40 Video S/N dB ≥48 Audio Audio Dev KHz ?0 Audio Freq Response dB ≤1.5 Audio S/N dB ≥54 General Power Supply V 220?0% Temperature Range ℃ 0~40 Dimensions cm 48.3?0.5?.3