Anttron TMX4KL HDMI to DVB-T/C Modulator – 4K HDMI Loop, 1080p Encode & RF Bypass

The Anttron TMX4KL is a compact HDMI-to-DVB-T/C modulator that allows any HDMI-equipped device to be watched on every TV in a building via the existing coaxial cable infrastructure. The output channel appears alongside regular digital terrestrial channels in the TV's channel list, with modulated resolutions up to 1080p. Unlike the standard TMX170HD, the TMX4KL includes a 4K-capable HDMI loop output, preserving the source signal at full 4K resolution for a directly connected display.

RF Bypass ensures existing antenna signals pass through uninterrupted. The device is configured through a 3-button menu with a 2×16 character LCD, with full SI table insertion and detailed channel parameter control.

Key Features

• Converts HDMI input to DVB-T or DVB-C RF output for distribution over coaxial cable
• Modulated output up to 1080p (480p, 576p, 720p, 1080i, 1080p)
• 4K HDMI loop output — passes the source signal at 4K resolution to a local display
• RF Bypass for uninterrupted pass-through of existing coaxial signals
• 3-button control with 2×16 character LCD for on-device configuration
• Full SI table insertion: PAT, PMT, SDT, NIT
• Configurable channel/network name, SID, LCN, TSID, ONID, NID, audio and video PIDs

Product Benefits

• Distributes any HDMI source to every TV on the coaxial network without new cabling
• 4K HDMI loop means the primary display retains full 4K resolution — nothing is downscaled locally
• RF Bypass keeps all existing antenna channels available on the network simultaneously
• Full SI table configuration enables proper LCN ordering in digital channel lists
• H.264 video compression at 5–15 Mb/s balances picture quality with coaxial bandwidth
• AAC-LC / MPEG1-L2 audio at 128–384 Kb/s with HDMI sample rate support (32, 44.1, 48 kHz)

Technical Specifications

• Model: Anttron TMX4KL / MPN: TMX4KL
• Video Input: HDMI
• Resolution Modes (modulated output): 480p, 576p, 720p, 1080i, 1080p
• HDMI Loop Resolution: 4K
• Video Compression: H.264 — bitrate 5–15 Mb/s
• Audio Input: HDMI
• Audio Sample Rate: 32kHz / 44.1kHz / 48kHz
• Audio Compression: AAC-LC / MPEG1-L2 — bitrate 128–384 Kb/s
• SI Tables: PAT, PMT, SDT, NIT
• Output: DVB-T/C RF
• Output Frequency / Level: 170–230 MHz + 470–862 MHz / >85 dBμV
• Constellation / FEC: QPSK/16QAM/64QAM — 1/2, 2/3, 3/4, 5/6, 7/8
• Guard Interval: 1/4, 1/8, 1/16, 1/32
• Mode / MER: 2K/8K — 34 dB
• Power Connector: DC 2.1mm — +5V
• Power Consumption: 5 Watts

Why You'll Love It

• 4K HDMI loop means the room's primary display gets the full 4K feed while other TVs share the HD distribution
• Uses the existing coaxial infrastructure — no new cabling or drilling required
• Simple 3-button LCD menu allows full channel configuration without a PC
• Includes power supply and instruction manual — complete and ready to install