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DVB Modulator with 8-16-24 HDMI Inputs | HDM-9400 series

BLANKOM HDM-9408/HDM-9416/HDM-9424

The full-featured BLANKOM HDM-9400 Modulator is ideal for small CATV headend systems, and it’s a smart choice for hotel TV systems, entertainment systems in sports bars, hospitals, and apartment complexes. The HDM-9400 is our most versatile modulator, offering a broad range of options.

Features

8/16/24 HDMI Inputs
DVB-C, DVB-T, ISDB-T, ATSC RF Output Alternatives
12 (16) DVB-C or 8 (12) DVB-T Carrier Outputs
Multiplexer
1 ASI input
1 USB Player input for re-mux
128 SPTS IP input
Ordering guide

HDM-9408C: 8 HDMI Inputs, 12 DVB-C RF Carriers Out
HDM-9408T: 8 HDMI Inputs, 8 DVB-T RF Carriers Out
HDM-9408I: 8 HDMI Inputs, 8 ISDB-T RF Carriers Out
HDM-9408A: 8 HDMI Inputs, 8 ATSC RF Carriers Out
HDM-9416C: 16 HDMI Inputs, 12 DVB-C RF Carriers Out
HDM-9416T: 16 HDMI Inputs, 8 DVB-T RF Carriers Out
HDM-9416I: 16 HDMI Inputs, 8 ISDB-T RF Carriers Out
HDM-9416A: 16 HDMI Inputs, 8 ATSC RF Carriers Out
HDM-9424C: 24 HDMI Inputs, 12 DVB-C RF Carriers Out
HDM-9424T: 24 HDMI Inputs, 8 DVB-T RF Carriers Out
HDM-9424I: 24 HDMI Inputs, 8 ISDB-T RF Carriers Out
HDM-9424A: 24 HDMI Inputs, 8 ATSC RF Carriers Out

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DVB Modulator with 8-16-24 HDMI Inputs, DVB-C, DVB-T, ISDB-T or ATSC Output

 

BLANKOM HDM-9400 is a high-integration professional modulator that combines encoding, multiplexing, and modulation into a single unit. Available in 12 different versions, it has several input and output combinations. Besides the HDMI inputs, the signals can also be fed through the IP, ASI and USB inputs. All the available content can be multiplexed into several packets and modulated into RF carriers.

 

BLANKOM HDM-9416C DVB Modulator

BLANKOM HDM-9416C DVB Modulator

  • 8/16/24 HDMI Inputs
  • 12 (16) DVB-C or 8 (12) DVB-T Modulation Packages at the RF Output
  • ISDB-T or ATSC RF Modulation options
  • Multiplexer
  • 1 ASI input
  • 1 USB player input for inserting an own INFO channel
  • 128 SPTS IP input UDP/RTP/RTSP/HLS/HTTP/SRT
  • 12 versions:
    HDM-9408C: 8 HDMI Inputs, DVB-C 12 RF Multiplex Carriers Out
    HDM-9408T: 8 HDMI Inputs, DVB-T 8 RF Multiplex Carriers Out
    HDM-9408I: 8 HDMI Inputs, ISDB-T Out
    HDM-9408A: 8 HDMI Inputs, ATSC Out
    HDM-9416C: 16 HDMI Inputs, DVB-C 12 RF Multiplex Carriers Out
    HDM-9416T: 16 HDMI Inputs, DVB-T 8 RF Multiplex Carriers Out
    HDM-9416I: 16 HDMI Inputs, ISDB-T Out
    HDM-9416A: 16 HDMI Inputs, ATSC Out
    HDM-9424C: 24 HDMI Inputs, DVB-C 12 RF Multiplex Carriers Out
    HDM-9424T: 24 HDMI Inputs, DVB-T 8 RF Multiplex Carriers Out
    HDM-9424I: 24 HDMI Inputs, ISDB-T Out
    HDM-9424A: 24 HDMI Inputs, ATSC Out
  • Logo/Text injection to the encoded videos
  • PID filtering and re-mapping
  • PSI/SI rebuilding and editing
  • Remote control and firmware, web NMS management
  • MPEG-1 Layer 2, LC-AAC, HE-AAC and AC3 Pass through Audio encoding, audio gain adjustment
  • Excellent non-adjacent RF output performance: MER≥42 dB + separate -20dB Test-Output port
  • Web-based Network management
  • Professional quality, breakthrough price

 

1. Input Processing & Capacities

The unit serves as a massive aggregation point for both local physical hardware and network streams:
    • Physical Video/Audio: 8/16/24 × HDMI inputs (v1.4).
    • Data Pipelines: 128 × IP inputs via the main Gigabit Ethernet (GE) data port over UDP and RTP protocols.
    • Legacy Ingest: 1 × ASI input (BNC) for re-multiplexing external Transport Streams.
    • Local Playback: 1 × USB port allowing direct ingest and looping of local .ts media files formatted to FAT32 filesystem structures.

2. Compression & Video Processing

The encoder compresses raw video frames down to compliant broadcast bitrates using hardware-accelerated processing:
    • Video Codecs: Primarily MPEG-4 AVC / H.264 (Note: Modern “-N” sub-variants also introduce HEVC / H.265 video encoding options).
    • Resolution Adaptability: Ingests up to 1080p at 60Hz. It processes and scales output streams down to efficient distribution frame rates:
        • Input Profiles: 1080p @50/60, 1080i @50/60, 720p @50/60.
        • Output Profiles: 1080p @25/30, 720p @25/30, 576p @25, 480p @30.

    • Bitrate Limits: 1 Mbps to 13 Mbps per individual channel using CBR (Constant) or VBR (Variable) rate control.
    • Audio Compressions: MPEG-1 Layer II, LC-AAC, HE-AAC, and AC3 Dolby Pass-through with software audio gain adjustments (0–255).

3. DVB-C RF Modulation Specs

The device packs encoded channels into RF carriers using standard digital cable modulations:
  • Carrier Density: Configurable to output 12 (or 16 option) non-adjacent DVB-C carriers out of a single physical F-type RF port.
  • Modulation Standard: J.83A (Europe) and J.83B (USA) profiles.
  • Constellation Matrix: 16QAM, 32QAM, 64QAM, 128QAM, and 256QAM configurations.
  • Frequency Range: 50 MHz to 960 MHz adjustable at microscopic 1 kHz stepping phases.
  • Signal Output Metrics: RF output level scales between -20 dBm to +3 dBm. It guarantees clean, clear distributions across hotel or building backbones with a high MER (Modulation Error Ratio) ≥ 42 dB.

4. DVB-T RF Modulation Specs

The device packs encoded channels into RF carriers using standard terrestrial modulations:

  • Carrier Density: Outputs 8 (or 12 option) non-adjacent carriers through a single physical F-type RF output port.
  • Standard: Fully compliant with the ETSI EN 300 744 DVB-T broadcast standard.
  • Transmission Mode: Supports both 2K (for small, local setups) and 8K (for wider, robust distributions) COFDM modes.
  • Constellations: Configurable to QPSK, 16QAM, or 64QAM mapping matrices.
  • Guard Interval: Selectable ratios of 1/4, 1/8, 1/16, or 1/32 to eliminate signal ghosting and echoes.
  • Code Rate (FEC): Error correction configurations of 1/2, 2/3, 3/4, 5/6, and 7/8.
  • Bandwidth Selection: Adjustable channel channelization filters at 6 MHz, 7 MHz, or 8 MHz.
  • Frequency Band: Tunable across the VHF and UHF ranges from 50 MHz to 960 MHz in 1 kHz steps.
  • RF Performance: Delivers an output level of -20 dBm to +3 dBm with a high signal purity of MER ≥ 42 dB.

5. Concurrent Network Outputs

While broadcasting over coax, the device mirrors its output streams to modern IP endpoints:
    • IP Stream Output: Transmits mirrored MPTS (Multi-Program Transport Streams) over UDP and RTP/RTSP, correlating exactly to each active DVB-C RF carrier.
    • ASI Mirroring: Features 1 × physical ASI output port configured via software to act as a mirror for any single chosen RF carrier block.

6. Software Features & Mechanics

  • Content Injection: Built-in dynamic on-screen display allows adding structural local branding including custom logos, crawling text captions, and QR codes onto any live HDMI video feed.
  • Multiplexing Control: Offers thorough PID filtering, custom PID remapping, automatic PCR accurate adjustments, and complete manual PSI/SI editing (PAT, PMT, NIT, SDT tables).
  • Management interface: Complete control over parameters via a standard Web-GUI accessed through a dedicated RJ45 network management port.

 

 

BLANKOM HDM-9416C block diagram

BLANKOM HDM-9416C DVB Modulator Application Example

BLANKOM HDM-9400 Series – Professional Application Examples

  • Hospitality IPTV & Coaxial Hybrid TV Headends: Deployed in large hotels, luxury resorts, and cruise ships to ingest up to 24 local media sources—such as media players, local camera loops, and property info channels—via HDMI, modulating them directly into standard DVB-C or DVB-T RF channels. This allows hundreds of in-room guest televisions to receive high-definition channels over existing coaxial cable networks without requiring expensive external set-top boxes (STBs).

  • Gated Communities & Residential Building RF Distribution: Serving as the central distribution hub for residential complexes and compound estates. The unit aggregates local satellite receiver outputs via HDMI and modulates them into standard regional RF formats (DVB-C, DVB-T, ATSC, or ISDB-T), delivering multi-channel HD television packages smoothly across the shared coaxial backbone to every apartment.

  • Sports Bars, Arenas, and Fitness Center Display Matrices: Positioned in high-density commercial entertainment venues to distribute live sports feeds, digital signage, and premium tuner channels. By utilizing the 8, 16 or 24 HDMI input configurations, management can distribute multiple HD live games simultaneously to dozens of surrounding TV displays over simple RF splitters, entirely eliminating complex and expensive HDMI matrix switcher cabling.

  • Corporate & Campus Information Networks: Deployed across enterprise headquarters, university campuses, and large bank branch grids to distribute internal training videos, executive live addresses, and corporate marketing loops. The system encapsulates these corporate HDMI feeds into clean RF frequencies, enabling standard televisions in breakrooms, lobbies, and lecture halls to tune in directly.

  • Hospitals & Healthcare Patient Entertainment Systems: Integrated into medical facilities to feed high-definition television packages and custom patient education channels directly into hospital bed displays. The high-density HDMI chassis allows the tech team to bundle specialized health feeds alongside standard channels into a single, clean coaxial cable distribution grid.

  • Airport & Mass Transit Information Display Distribution: Deployed within flight terminals, train stations, and public transit hubs to stream flight schedules, security guidelines, and emergency alerts from centralized servers. The modulators broadcast these HDMI graphics arrays over standard RF distribution cables to hundreds of monitors distributed across vast physical distances.

  • Shopping Malls & Large Retail Digital Signage Layouts: Acting as a heavy-duty RF master controller for commercial shopping complexes to distribute synchronized promotional video loops and tenant advertisements. Utilizing a single HDM-9400 device eliminates local PC players behind every screen by broadcasting the promotional HDMI content directly over standard RF cable links.

  • Command Control Rooms & Industrial Monitoring Walls: Stationed within public utility, maritime, or manufacturing control facilities to ingest up to 24 independent computer telemetry, radar, or local surveillance maps via HDMI. The modulator merges these feeds into a dedicated RF multiplex, allowing operators to display any technical visual on any standard wall monitor over coaxial routing.

  • Educational Distance Learning & School TV Networks: Positioned within high schools, universities, and training academy hubs to create an internal broadcasting network. Local studio cameras, educational documentary players, and PC lecture feeds are fed via HDMI into the modulator, which broadcasts them as discrete digital channels accessible by every classroom television.

  • Government & Correctional Facility Secure TV Systems: Deployed in highly secured government compounds or correctional institutions where local network security protocols prohibit traditional IP or Wi-Fi data streaming. The unit safely distributes controlled informational, educational, and entertainment media from safe HDMI sources using completely air-gapped, isolated coaxial RF infrastructures.

 

BLANKOM HDM-9416C DVB Modulator

BLANKOM HDM-9416C DVB Modulator

 

Function: DVB Modulator

Input

  • 8/16/24 HDMI inputs
  • 1 ASI in for re-mux
  • 1 USB Player input for re-mux
  • 128 MPTS IP input over UDP and RTP, GE port, RJ45
  • SPTS input over UDP/RTP/RTSP/HLS/HTTP/SRT

Video

Encoding: MPEG-4 AVC/H.264

Resolution:

Input:

1920×1080p60,1920×1080i60,
1920×1080p50,1920×1080i50,
1280×720p60, 1280×720p50,
720×576i50,720×480i60,

Output:

1920×1080p30, 1920×1080p25,
1280×720p30, 1280×720p25,
720×576p25,720×480p30

Encoding: HEVC/H.265 & MPEG-4 AVC/H.264
Bit-rate: 1 Mbps…13 Mbps every channel
Rate Control: CBR/VBR
GOP Structure: IP…P (P Frame adjustment, without B Frame)

Audio

Encoding: MPEG-1 Layer 2, LC-AAC, HE-AAC and AC3 Pass through
Sampling rate: 48KHz
Resolution: 24bit
Audio Gain: 0-255 Adjustable
MPEG-1 Layer2 Bit-rate: 48/56/64/80/96/112/128/160/192/224/256/320/384 kbps
LC-AAC Bit-rate: 48/56/64/80/96/112/128/160/192/224/256/320/384 kbps
HE-AAC Bit-rate: 48/56/64/80/96/112/128 kbps

Multiplexing

Maximum PID Remapping: 255 input per channel
Function:

PID remapping ( automatically or manually)
Automatic PCR adjusting
Generate the PSI/ SI table automatically

Modulation

DVB-C

QAM Channel
12 non-adjacent carriers output (maximum bandwidth 192MHz)
Standard EN300 429/ITU-T J.83A/B
MER ≥40dB
RF frequency 50…960 MHz, 1 kHz step
RF output level -20…+3 dBm, 0.1 dB step
Symbol Rate 5.0MSps…7.0 MSps, 1 kSps stepping
J.83A J.83B
Constellation
16/32/64/128/256
QAM 64/256 QAM
Bandwidth: 8 MHz, 6 MHz

DVB-T

8 non-adjacent carriers output
Standard EN300744
FFT mode 2K, 4K, 8K

           ATSC

Standard ATSC A/53
Bandwidth 6M
Constellation 8VSB
FEC RS(208 188)+Trellis
MER ≥40dB
ACL -55 dBc
RF frequency 50~960 MHz, 1 kHz step
RF output channel 16 non-adjacent carriers output (maximum bandwidth 192 MHz)
RF output level -20~+3 dBm (for all carriers), 0.5 dB stepping

ISDB-T

Standard ARIB STD-B31
Bandwidth 6M
Constellation QPSK, 16QAM, 64QAM
Guard Interval 1/32, 1/16, 1/8, 1/4
FFT Mode 2K, 4K, 8K
Code rate 1/2, 2/3, 3/4, 5/6, 7/8
MER ≥40dB
RF frequency 50~960MHz, 1KHz step
RF output channel 16 non-adjacent carriers output (maximum bandwidth 192MHz)
RF output level -20dBm~+1dBm, 0.1dB stepping

 MPTS Output

1 ASI output as mirror of one of RF output carriers (option)
32 MPTS output over UDP and RTP/RTSP as mirror of 32 DVB-C carriers(or 16 MPTS output over UDP and RTP/RTSP as mirror of 16 DVB-T/ATSC/ISDB-T carriers for option), 1*1000M Base-T Ethernet interface, GE port

SPTS Output

SPTS over UDP/RTP/RTSP/RTMP/HLS/HTTP/SRT

System

Network management (WEB)
English language
Ethernet software upgrade

Dimension (W×L×H) 482mm×328mm×44mm

Environment 0~45℃(work)；-20~80℃（Storage）

Power requirements AC 110V± 10%, 50/60Hz, AC 220 ± 10%, 50/60Hz

 

 

Specifications are subject to change without prior notice.

The BLANKOM HDM-9400 series represents a high-density, professional hardware encoding and modulation solution designed for commercial RF headends. It ingests high-definition digital signals from multiple HDMI sources (such as media players, satellite receivers, or signage players), compresses the video/audio payloads in real time, and modulates them directly into standard digital cable or terrestrial RF carriers.

To accommodate different project scales and input density requirements, the product family is strictly structured into three hardware chassis configurations:

  • HDM-9408: Equipped with 8 physical HDMI input ports.

  • HDM-9416: Equipped with 16 physical HDMI input ports.

  • HDM-9424: Equipped with 24 physical HDMI input ports.

The series features exceptional output flexibility at the factory provisioning stage, allowing operators to select between DVB-C (digital cable) or DVB-T (digital terrestrial) RF modulation standards (ISDB-T and ATSC options are also available). This guarantees seamless compatibility with existing building distribution topologies, standard edge televisions, and commercial digital set-top boxes.

The advanced digital modulation engine for the DVB-C integrated version is engineered to output exactly 12 independent RF multiplex carriers (carriers/frequencies) simultaneously. This high-density carrier aggregation ensures ample bandwidth to handle and distribute extensive channel lineups from up to 24 HDMI sources over a single coaxial cable line without throughput starvation.

The terrestrial distribution version configured with a DVB-T modulation block is engineered to output exactly 8 independent RF multiplex carriers concurrently. This specific microcode mapping is optimized to comply with standard digital terrestrial channel spacing and bandwidth constraints while maintaining stable signal delivery across corporate or hospitality networks.

Yes. The HDM-9400 series incorporates a powerful internal hardware encoding core. It performs real-time compression of the incoming raw HDMI signals using professional, high-efficiency video and audio codecs (typically H.264/AVC for video and AAC/MPEG-1 Layer II for audio), reducing the immense raw data rate into optimized transport streams suitable for RF modulation.

Yes, the series features a fully integrated digital multiplexing engine. This framework allows headend engineers to open the encoded streams, execute precise PID filtering and PID remapping, inject custom descriptors, and freely assign which specific HDMI input programs are bundled into which of the available DVB-C (12 RF) or DVB-T (8 RF) multiplex carrier outputs.

Yes. Because it possesses an integrated multiplexing core, the system automatically builds and updates the necessary PAT, PMT, NIT, and SDT metadata tables in real time. Through the administrative user layout, operators can manually edit service names, customize provider strings, and assign Logical Channel Numbering (LCN) to deliver a perfectly customized channel guide to the end subscriber.

System provisioning, HDMI input encoding bitrates, channel allocations, and RF output parameters are managed exclusively via an embedded WebGUI using a standard internet browser through a dedicated, independent Ethernet management port. This model line does not support SNMP management, prioritizing secure, low-overhead web administration and an isolated control plane.

Built for demanding 24/7/365 continuous hospitality and telecommunication uptimes, all models (8, 16, and 24 inputs) are enclosed in a rugged, standard 19-inch 1U rack-mount industrial metal chassis. The enclosure implements smart active cooling fans for stable thermal management and can be verified through our technical Ordering Guides with options for dual redundant power supplies to negate primary AC power line dropouts.

 

 

 

 

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