DTV System MPEG-2 QAM Modulator 8 ASI With Multiplexing Scrambling

GQ-3650DS

Multifunction QAM Modulator

GOSPELL GQ-3650DS can receive MPEG-2 transport streams from 8 ASI inputs and 2 E3/DS3 inputs (optional for GQ-3650E), and then multiplexing, scrambling and processing it with channel coding, finally output 4 channels of adjacent RF signals after QAM modulation, GQ-3650DS/GQ-3650E is our economical core product of digital cable TV head end solutions. Users can get these functions upon their system needs and budgets by purchasing the update package from the suppliers.


Main Features:

• Support 8 ASI inputs, support CBR and VBR
• Support ITU-T J.83A/B/C, output frequency range: 30 MHz ~ 860 MHz
• Expandable up to four RF modulating output (GQ-3650DS optional)
• Support two E3/DS3 inputs and two ES/DS3 loop outputs (GQ-3650E optional)
• Support PID filtering, pass-through, PCR auto-correction
• 4 adjacent frequency output with output-channel selection switch
• 88/204 self-adaptive packet length with real-time input data format display
• Extremly large buffer design, support both burst & uniform input streams, and also support re-uniforming of the input data, in order to improve the output efficiency
• Modulated transport streams can be either directly passed through, multiplexed or scrambled
• NIT mapping & forwarding up to 45 frequencies
• 8 groups of PID filtering and re-mapping
• Support various customizable PSI/SI table extraction, resolving and modification
• Support SI table information replacement and insertion
• Self-adaptive filter circuit design ensures outstanding out-of-band rejection
• Centralized Web, SNMP(GQ-3650DS) management and remote upgrade / maintenance
• Support monitoring of operation temperature and power supply status

For More Information

Please visit our website: or contact your local sales representative:

     Gospell Digital Technology Co., Ltd. (Stock Code: 002848) is a high-tech enterprise in the field of electronic information. It is recognized as a "benchmark enterprise in the electronic information industry" and a "key high-tech enterprise of the National Torch Plan" in China. It is a leading enterprise and backbone enterprise in the broadcast television transmission and satellite transmission service industries. Additionally, it is a leading enterprise in the electronic information manufacturing industry in Hunan Province and is internationally renowned as a brand enterprise. It is also recognized as a nationwide contract-abiding and trustworthy unit and a Chinese quality and integrity enterprise. The company was established in 1993 and founded Chenzhou Gospell Digital Technology Co., Ltd. in 2001. On February 13, 2017, it was listed on the Shenzhen Stock Exchange. In 2020, Weifang Bincheng Investment Development Co., Ltd. became the controlling shareholder of the company, with the Weifang State-owned Assets Supervision and Administration Commission becoming the actual controller of the company. The company is headquartered in Gospell Industrial Park, Suxian District, Chenzhou City, Hunan Province. It has eight wholly-owned subsidiaries: Chengdu Tongcy Digital System Co., Ltd., Chenzhou Gospell Digital Technology Co., Ltd., Chenzhou Gongtian Electronic Ceramic Technology Co., Ltd., Chenzhou Gospell Precision Manufacturing Co., Ltd., Gospell Digital Technology (Shandong) Co., Ltd., Gospell Digital Technology Hong Kong Co., Ltd., Gospell Digital Technology India Subsidiary, and Shenzhen Qianhai Xutian Communication Co., Ltd. It operates one production base, consisting of five major workshops: SMT workshop, DIP workshop, assembly workshop, injection molding factory, and hardware factory, with a total of 45 production lines.

    As a national high-tech enterprise, Gospell boasts a sophisticated technology R&D matrix and has mastered more than 20 core technologies in the audio and video field. Several technological innovations have been recognized as "national key new products" and "provincial-level scientific and technological achievements," and have received the "Hunan Province Science and Technology Progress Award." As of December 2023, the company has undertaken eight provincial-level and higher scientific and technological achievement transformation projects. It holds over 65 intellectual property patents, including 52 invention patents, 9 utility model patents, and 4 design patents. Additionally, Gospell has secured 117 computer software copyrights.

   We commenced our overseas operations early, embarking on digital television system construction in international markets as early as 2004. To date, we have constructed over 200 ground and cable digital television systems, exclusively supplying core equipment, in more than 60 countries across Asia, Africa, Latin America, and Europe.