Digital QAM Modulator (SD-3650D)

SD-3650D QAM modulator is the broadcasting professional level of head-end equipment which is in the line with DVB standard. Its mainly function is to realize the QAM modulation for the TS code stream which is in the line with DVB and ATSC standards and transmit from HFC network or MMDS network. QPSK modulator modulates the data stream of input DVB standard to RF signal. When PAL format, the bandwidth is no more than 8MHz, NTSC format, bandwidth is no more than 6MHz in order to adjacent transmit with the other relevant analog TV or QAM signal. The data stream which is line the line with DVB standard includes MPEG-2 digital TV, digital broadcast, VOD and other variety of digital signals. SD-3650D QAM modulator is widely used in the HFC, MMDS network and 8GHz microwave system.

Mainly features:
1. 188/204 Adaptive packet length and display the input data format real-timely
2. Super large cache design, ASI interface supports burst and uniform input stream
3. Have functions of NIT mapping and transmission, support over 44 NIT mapping of frequency points
4. 8 groups of PID filtering and mapping function
5. Support extraction, analysis and modification of PSI/SI
6. Filter the empty input data packet and fill the output data
7. PCR correction function, accurately correct the PCR in the input data separately

8. Real-timely test and display of the input system rate and effective rate
9. Provide -20dB RF test interface and IF output
10. Fault alarm display
11. Power down memory function
12. LCD display
13. ASI input (E3/DS3 optional)
14. A variety of QAM working methods
15. Network controlling interface, realizing Centralized network management, remote upgrade and maintenance

Performance and Parameter

1. QAM modulation
Modulation: 16QAM/32QAM/64QAM/128QAM/256QAM
Symbol Rate: 1~7Mbauds
Coding: RScoding
MER: ≥ 36dB
Channel Data Rate: 56Mbps

2. Input data interface
Serial port: ITU-T DVB ASI BNC G. 703 E3/DS3 BNC(Optional)
Parallel Port: DVB SPI dB-25

3. IF
Connector: SMA
Impedance: 50Ω
Center frequency: 36MHz/35.25/36.15/44MHzOptional
IF bandwidth: ≤ 8MHz
Return loss: ≥ 18dB
Output electric level: 100dBuV(RMS)
SNR: ≥ 50dB
MER: Better than 43dB(RMS)

4. RF output
Output frequency: 48~860MHz
Output electric level: 100~115dBuV
Phase Noise: Better than 95dBc@10KHz
Impedance: 75Ω

5 network interface
Ethernate RJ-45 interface

6. Power supply
AC220V10%, 50/60Hz, 40W

7. Working environment:
Working temperature: 0~40
Storage temperature: -20~80