Description
The module able to generate a signal in DVB‐T format (Digital Terrestrial Television) from HDMI input.
4 Channel HD QAM Modulator It is MPEG‐4 and MPEG‐2 encoding, DVB‐T modulation integrated device to convert HDMI signal to DVB‐T RF out.
The module adjusts the compression rate to the available bandwidth, using themodulation DVB‐T parameters.
Specification
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Place of Origin: Guangdong, China |
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Model Number: GDM-032 (GFTM-860QH) |
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ITEM |
TYPICAL |
Q.C LIMIT |
TEST CONDITIONS |
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1. Encoding Section |
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Video |
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Encoding |
H.264/MPEG-2 |
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HD:H.264 AVC/HP@L4.0 SD: MPEG-2/MP@ML |
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Bit Rate |
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256QAM: 7.6Mbps |
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Aaverage Encoding |
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256QAM: 8Mbps |
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Resolution |
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HD 1080p (HDMI IN) |
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Audio |
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Encoding |
MPEG2/AAC |
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Sample Rate |
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48KHz |
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Bit Rate |
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384kbps |
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2. Input |
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Video Input |
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HDMI: 1080p 25/30, 1080i 50/60 Max |
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Input Connectors |
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3XHDMI |
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3. QAM Modulator |
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Modulation Types |
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ITU-T J83 Annex B |
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Cable Standard |
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STD |
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QAM |
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64QAM, 256QAM |
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MER |
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≥32dB |
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RF Frequency |
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57 – 861MHz |
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RF Output Level |
100dBμV |
100dBμV ±5dBμV |
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RF Level Adj |
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0dB ~ -36dB |
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Attenuation step |
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2dB per step |
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4. System |
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Local Interface |
LCD + control buttons |
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Remote management |
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Web Management |
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Ethernet port |
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RJ45, 100M |
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5. General |
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Power supply |
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AC Input: 100V ~240V 50/60Hz |
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Operation Temperature |
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0°C - 50°C |
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Relative Humidity |
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20% ~ 80% |
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Dimensions |
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19" x 12.5" x 1.75" |
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Weight |
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2.5Kg |
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Company Profile
Goodmind Electronics (Shenzhen) Co., Ltd. was established in 1992 with a registered capital of 18 million U.S. dollars. Its own factory is located in Shenzhen and has more than 1000 employees. It is a high-tech enterprise integrating R&D, production, sales and service , The company specializes in Antenna / Network Communication / Bluetooth / AV Accessories / Smart Home / Car Accessories professional manufacturing company. The factory is vertically integrated. The factory has plastic processing, metal stamping, zinc die casting, SMT , DIP and Assembly center. The company has strong financial strength, professional R&D team, excellented manufacturing equipment and lean manufacturing, and is dedicated to creating high-quality products for customers.
What are the key features of a 4-channel HD QAM modulator?
Key features typically include support for multiple HD video inputs, QAM modulation, adjustable output frequency, RF output level adjustment, web-based management interface, and compatibility with various cable standards.
What are the applications of a 4-channel HD QAM modulator?
These modulators are commonly used in cable headends, hospitality industry (hotels, resorts), healthcare facilities, educational institutions, and digital signage systems to distribute high-definition video and audio content over existing coaxial cable infrastructure.
How does a 4-channel HD QAM modulator work?
The modulator takes multiple HD video and audio inputs, encodes them into MPEG transport streams, modulates them using QAM, and combines them into a single RF channel for distribution over the cable network. Receivers tuned to the specific channel can then decode and display the content.
FAQ
Q: What types of inputs does a 4-channel HD QAM modulator support?
A: Typically, these modulators support HDMI, SDI, component, and composite video inputs, along with analog or digital audio inputs. Some models may also feature IP (Ethernet) inputs for streaming video content.
Q: What cable standards are supported by a 4-channel HD QAM modulator?
A: Most 4-channel HD QAM modulators support common cable standards such as DVB-C (Digital Video Broadcasting - Cable), ATSC (Advanced Television Systems Committee), and ISDB-T (Integrated Services Digital Broadcasting - Terrestrial).
Q: How do you configure and manage a 4-channel HD QAM modulator?
A: Configuration and management are typically done through a web-based interface accessible via a computer connected to the same network as the modulator. Through this interface, users can adjust channel parameters, set modulation settings, manage input sources, and monitor system status.
Q: What are the advantages of using a 4-channel HD QAM modulator?
A: Advantages include the ability to distribute multiple HD channels over existing coaxial cable infrastructure, cost-effectiveness compared to upgrading to IP-based distribution systems, compatibility with a wide range of cable standards, and ease of configuration and management.
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