QPSK to QAM Trans Modulator

Features

Complying DVB standard signal channel coding

Support full range variable data rate, bandwidth and QAM mode Data stuffing

Super buffer (optional), anti-burst code stream

PID filter, re-reflection, PSI,SI information synchronal updating possible

Automatically code stream stuffing and empty pocket deleting

Code stream real-time monitoring, empty pocket filtering

Support NIT table modifying

Real-time code stream monitoring

PCR adjusting, output symbol rate variable:1-7 Ms/s

Fixed or agile channel output

Providing ASI and DS3 (optional) code stream interface.

Providing RF output monitoring port (-20dB)

Local or Remote administration possible

LCD display, flexible in operating

High reliability design, stable in running

Equipment combining QPSK decoding with QAM modulation

Specification

QAM decoding unit index

 Modulating mode               16, 32,64,128,256 QAM

Symbol rate                              3-7 M baud/s

Correction coding                    RS Coding 188/204

Input data rate                         1.5~51 Mbps

Channel data rate                    20~56 Mbps

MER                                 >33dB

BER                                         0

 Input interface                     ASI/SPI       DVB standard 

Output

IF Freuency                              36/36.15/36.65/44/70 MHz (optional)

RF Frequency                          110~870 MHz

Output Level                             >=115dBμV

Output level adjustable         0-16 dB (0.5dB stepping)

Impedance                                75Ω

Output return                            >=12dB 

QPSK decoding unit index

Frequency range                 950~2150 MHz

Symbol rate                        2~45 Mbaud/s

Frequency stepping             1MHz 

Input

Input level                                       -65~-25 dBm

Input port                                        F head

Impedance                                      75 Ω 

Rolling factor                                   35% (square root to cosine) 

FEC built-in decoder                       M=7, convolution bit rate 1/2,2/3,3/4,5/6,7/8 

Miscellaneous

Dimension                                       44mm*482mm*410mm

Temperature                                   0~45operating);-20~80(storage)

Power                                              220VAC±10%,50Hz, 25W