QAM Modulator(DMB-5000 model) for DVB-C System is the key equipment of Digital Cable Television network. It receives MPEG TS via ASI interface, realizes DVB-C channel encoding and QAM modulation, then output intermediate frequency signal, finally upconvert intermediate frequency signal into RF signal. With digital IF modulation, the QAM modulator has the high performance of MER, carrier-to-noise ratio, phase noise, margin of error, etc. It also supports PID filtrating & mapping and PSI/SI updating. For the best performance and high stability, our DMB-5000 QAM Modulator is the best choice of the DTV operators.

Main features

• The signal coding comply to ITU-T J.83
• PID filtrate and remapping can be configured
• PSI/SI information updating possible
• Filling MPEG TS automatically and delete empty packet intellectively
• PCR emendation supported
• 188/204 data packet adaption automatically
• RF output frequency scope 48~862MHz, in 0.1MHz step
• Output level can be adjusted correctly in 108~118dBuV
• Web browser remote control, network upgrade supported

Specification

• MPEG TS Input

2 ASI input

Comply to EN50083-9 ASI connecter

Effective bit rate                     1Mbps~51.6Mbps

ASI mode                              BYTE or BURST

MPEG frame                          188/204 data packet

Connector                              75ohm, BNC

• MPEG TS output

1 DVB-ASI loop through

Comply to EN50083-9 ASI connecter

Effective bit rate                      1Mbps~51.6Mbps

ASI mode                               BYTE or BURST

MPEG frame                          188/204 data packet

Connector                               75ohm, BNC

• RF Output

Output frequency                     50MHz~860MHz

Output level                             105dBuV~ 121 dBuV (adjustable)

Output return loss                    ≥10dB

I/Q amplitude unbalanced         0.1%

I/Q quadrature error                  0.1º

Phase jitter                              0.5º RMS

Outband restrain                       55dB

MER                                       33dB

C/N                                         45dB

Connector                                75ohm, F type

• QAM parameter

Mode                                      16, 32, 64, 128, 256 QAM

Symbol rate                             3.5~7 Mbaud/s

Width                                      ≤8MHz

• Control

Front Panel                             LCD display & cursor/execute keys

Web Server                             Embedded

• Power

Voltage                                  AC 90~260V

Frequency                              50~60Hz

Consumption                          Max. 30W

• Mechanical Parameter

Operational temperature         -10~50^oC

Storage temperature              -10~70^oC

Humidity                              10%-95%

Dimension                            318mm(W)×483(L)mm×44mm(H)

Weight                                 6kg