Antiference Conexer DMHD02 Twin HDMI to DVB-T / DVB-C HD Digital RF Modulator

The Antiference Conexer DMHD02 Twin HDMI Modulator is a compact, professional digital modulator designed to distribute two HDMI video sources throughout a property using an existing coaxial TV aerial distribution system.

Featuring two independent HDMI inputs, the DMHD02 converts high-definition HDMI video and audio into digital television channels, allowing connected televisions to receive and display both sources through their built-in digital TV tuners.

Both HDMI sources are combined into a single digital RF multiplex, enabling two HD channels to be distributed over one coaxial cable without requiring separate HDMI cables to every television.

Supporting Full HD 1080p resolution, H.264 video encoding and DVB-T / DVB-C modulation, the Conexer DMHD02 is ideal for domestic and commercial installations, including hotels, pubs, clubs, offices, schools, showrooms and digital signage systems.

The unit also incorporates USB recording and playback functionality, allowing video content to be recorded or played back over the RF distribution network.

Key Features

• Twin HDMI Inputs – Connect and distribute two independent HDMI video sources.
• Single RF Multiplex Output – Combines both HDMI sources into one digital television multiplex for distribution over coaxial cable.
• Full HD 1080p Support – Supports HDMI resolutions up to 1920 × 1080.
• DVB-T / DVB-C Modulation – Configurable digital terrestrial or digital cable RF output.
• H.264 Video Encoding – Efficient video compression for high-quality HD distribution.
• USB Recording & Playback – Record content and play compatible transport stream files directly from USB storage.
• Digital Signage Functionality – Ideal for distributing promotional videos, information channels and scheduled content.
• Custom Channel Naming – Assign individual service names to each HDMI source.
• Logical Channel Numbering (LCN) – Configure television channel positions for convenient access.
• Adjustable RF Output – Configure output channel, frequency and attenuation to suit the installation.
• Front Panel Programming – Integrated display and control joystick for straightforward configuration.
• Windows Configuration Software – Compatible with Antiference DMHDiFace software for advanced setup and programming.
• Expandable Distribution – Multiple modulators can be combined to provide additional HDMI television channels.
• Compact Design – Suitable for installation in domestic AV cabinets and professional distribution systems.RemoteLink Compatibility – Compatible with the Antiference RemoteLink system for infrared remote-control distribution when used with suitable additional equipment.

Distribute Two HDMI Sources to Multiple Televisions

The Conexer DMHD02 provides a practical solution for distributing HDMI equipment to televisions throughout a building without installing dedicated HDMI cables to each location.

Connect two HDMI devices to the modulator and configure each input as a separate digital television service. The modulator converts both sources into RF television signals which can be distributed through a conventional coaxial aerial system.

Each television can then tune into the two additional digital channels using its compatible DVB-T or DVB-C tuner.

Typical HDMI sources include:

• Satellite and digital TV receivers
• CCTV monitoring systems
• Media players
• Digital signage players
• Computers and presentation equipment
• Other compatible HDMI video sources

Both channels can be viewed independently on different televisions, allowing one television to display HDMI Input A while another displays HDMI Input B.

The DMHD02 is particularly useful where an existing coaxial distribution network is already installed and replacing it with HDMI cabling would be impractical or expensive.

USB Recording, Playback & Digital Signage

In addition to live HDMI distribution, the DMHD02 includes USB recording and playback functionality.

Compatible transport stream (.ts) files can be played from USB storage and transmitted through the coaxial network as a digital television channel.

This provides a convenient solution for commercial digital signage applications, including promotional displays, information channels, advertising and presentations.

USB playback can also be scheduled using the Antiference DMHDiFace Windows software.

Please note: During USB playback, HDMI Input A is temporarily suspended and the USB playback source takes priority.

Flexible Programming & Channel Configuration

The DMHD02 can be configured directly using its integrated front panel display and control joystick, without requiring a computer.

Alternatively, the manufacturer's DMHDiFace software provides configuration through a Windows computer.

Available configuration options include:

• DVB-T or DVB-C output selection
• RF output channel and attenuation
• Channel and network naming
• Logical Channel Number (LCN)
• Service identification (SID)
• Transport Stream ID (TSID)
• Original Network ID (ONID)
• Network ID (NID)
• Video and audio PID configuration
• Video and audio bitrate adjustment
• Modulation parameters

This flexibility makes the DMHD02 suitable for both straightforward domestic installations and larger commercial RF distribution systems.

Technical Specifications

General

• Manufacturer: Antiference
• Product range: Conexer
• Model: DMHD02
• Product type: Twin HDMI Digital RF Modulator
• HDMI inputs: 2 × HDMI 1.4
• RF modulation: DVB-T / DVB-C
• RF output: Single digital multiplex
• Video resolution: Up to Full HD 1080p

Video Encoding

• Input resolutions: 480p, 576p, 720p, 1080i, 1080p
• Video compression: H.264
• Video bitrate: 1–15 Mbps

Audio Encoding

• Audio input: HDMI
• Sampling frequencies: 32 kHz, 44.1 kHz, 48 kHz
• Audio compression: AAC-LC / MPEG-1 Layer II
• Audio bitrate: 128–384 Kbps

DVB-T RF Output

• Frequency range: 170–230 MHz / 470–862 MHz
• Output level: Greater than 86 dBµV
• Modulation: QPSK / 16QAM / 64QAM
• FEC: 1/2, 2/3, 3/4, 5/6, 7/8
• Channel bandwidth: 6 / 7 / 8 MHz
• Guard interval: 1/4, 1/8, 1/16, 1/32
• FFT mode: 2K / 8K
• MER: 35 dB

DVB-C RF Output

• Frequency range: 47–862 MHz
• Output level: Greater than 86 dBµV
• Modulation: 16 / 32 / 64 / 128 / 256 QAM
• Symbol rate: 2000–7000MER: Greater than 40 dB

Connectivity & Control

• 2 × HDMI inputs
• RF input and RF output
• USB connection for recording and playback
• USB connection for Windows software configuration
• Integrated front panel display and joystick
• Configurable channel names and LCN

Power & Physical Specifications

• Power supply: 5V DC
• DC connector: 2.1 mm
• Power consumption: 6W
• Dimensions: 170 × 110 × 30 mm
• Weight: 0.5 kg including power supply

Installation Information

The DMHD02 is designed to feed a compatible digital television distribution system.

Once installed and configured, televisions connected to the RF network can locate the additional channels by performing a digital channel scan.

An RF input allows integration with an existing aerial distribution installation.

For larger installations, additional modulators can be combined to increase the number of available HDMI channels.

Important: Televisions must support the selected DVB-T or DVB-C broadcast standard and H.264 HD decoding. HDMI sources using HDCP copy protection may not be compatible. Remote control of connected HDMI equipment from other rooms requires a suitable separate control system.

The Conexer DMHD02 is an excellent solution for anyone requiring reliable, high-definition HDMI distribution over existing coaxial cabling, combining two independent HDMI inputs, flexible digital RF modulation and useful USB media functions in one compact unit.