Outline
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:
* Constellation: QPSK/16QAM/ 32QAM/ 64QAM/ 128QAM/ 256QAM.
* The bite rate range of input data: 1.5~51.6Mbps
* The bite rate range of output data: 2~56Mbps
* The bandwidth range of output signal: 1.15~8.05Mhz
* The symbol rate range of output data: 1~7Mbaud/s
* RF range: 48~860MHz(segmented optional)
* Output level range: 100~115dBuv(step adjustable)
* Failure alarming
* RF test output interface for inspecting
* LCD display
* RJ45 ETHERNET interface(network management software is optional)
* Power off memory
Specifications
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RF input
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Input frequency
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950~2150MHz
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Level
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-79 ~ -11dBm
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IF Bandwidth
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27~36MHz
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Demodulation
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QPSK
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Impedance
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75Ω
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RF interface
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RF output
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Connector: BNC
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Impedance: 75Ω
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Output Frequency: 48~860MHz (segmented optional)
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Reflect loss ≥15dB
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Output level: 105~115dBuV (adjustable)
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Carrier rejection: > 55dB
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SNR(out of band):≥50dB
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RF output for test
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Connector: BNC
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Impedance: 75Ω
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Output level: 75dBuV~95dBuV (adjustable)
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Channel signal encoding
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Demodulation
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QPSK, 16QAM, 32QAM, 64QAM, 128QAM, 256QAM
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Channel encoding
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RS encoding meet to DVB standard
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MER
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≥36dB
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SNR(out of band)
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≥50dB
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Power supply
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Voltage
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165~265V AC or 85V~265V AC(Optional)
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Frequency
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50Hz±2%
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Power consumption
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35W
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Operation environment
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Operation temperature
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+5~45°C
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Storage temperature
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-25~+55°C
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Relative humidity
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10~75%
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Radiation and safety
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Up to GB13837-92 and GB8898-88 standards
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Mechanic characteristics
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Dimension
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44.5mm(1U)*483mm*(19”)*400mm
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Weight
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7kg
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