4 HDMI & Component HD to COAX and IPTV HD 480i/720p/1080i/1080p CC Modulator

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Description Features Drawings Video Model Selection Specification Q&A Documents Support

4 HDMI & Component HD to COAX, HD 480i / 720p /1080i / 1080p Modulator and IPTV Encoder Streamer

Low Latency, HDCP Compliant HDMI, MPEG2 and H.264 Video Encoding, Dolby AC3 Audio Encoding

QAM,  ATSC, DVB-T,  ISDB-T Modulation



The H-4ADHD-XXX-IPLL modulator family from Thor broadcast is designed to handle even more applications than any other 4 channel chassis system that has come before. This hdmi to coax modulator has all the previous award winning features found in Thor Broadcast modulators, as well as several new additional functions for added applications and flexibility. Our hdmi to coax converter provides 5 full RF carrier outputs for generating channels from content ingested through the ASI input. Encoding in either MPEG-2 or H.264 is provided for 4 crystal clear video streams up to 1080p60 each.

Bitrate is fully adjustable from 1.5 - 19 Mbps, and a variety of audio codecs are available. Standard audio encoding in MPEG-2 AAC and MPEG-4 AAC are provided, as well as a licensed Dolby AC/3 audio codec. Audio sources can be selected from either embedded HDMI or Analog RCA ports. For Surround sound, digital audio inputs can be set to "pass through" mode to preserve 5.1 and 7.1 audio that is encoded already in Dolby compatible format. Two mirrored ASI outputs are provided for broadcasters for added flexible in distributing the content generated by the 4 encoders.

This hdmi to coax splitter is an ideal solution for Professional Stadiums and Live Events. Used in more Collegiate stadiums for sports and distribution than any other model.

Programs input via ASI can also be multiplexed and remapped to the ASI output, adding yet another function to the unit as an ASI multiplexer.  IPTV is not neglected in any way.  All four encoded programs can be mapped to unique IP address outputs and ports in either UDP or RTP format.  The IP output can be configured to strip null packets to reduce network bandwidth or preserve the constant bit rate (CBR) packet stuffing normally preferred by television systems.  All four channels can be independently configured for either multicast or unicast outputs. Closed captioning is supported on a dedicated analog 608 CC port with RCA connector, an industry standard for line 21 captioning systems. Any 720 or 1080 line standard video signal in either HDMI or Component YPbPr format can be used for each of the four channels. Just like all other professional Thor modulator chassis, this system can be configured with firmware for either QAM, DVB-C, DVB-T, or ATSC channel format output.


  • Broadcast over existing Coaxial Cabling to an unlimited number of Televisions with FULL HD
  • Perfect for Professional Stadiums and Arena's
  • #1 in Live Sports and Entertainment 
  • Broadcast Live HDMI & YPbPr Video as Cable TV & IPTV Channels.
  • Licensed HDMI inputs - works with any source like DVD, Blu-Ray, or any STB
  • Convert HDMI & Component YPbPr HD Video to HDTV Channels
  • Any 1-4 HDMI & YPbPr Inputs up to 720p / 1080i / 1080p
  • Licensed HDMI inputs - works with any source like DVD, Blu-Ray, or any STB
  • 4 HDMI Cables FREE
  • Support DD AC3 (2.0 / 5.1 / 7.1) passthrough (for HDMI interface only)
  • Support CC (Closed Caption) EIA608 (from CVBS input)
  • 1-4 CATV RF Output up to 4 Adjacent channels
  • QAM-256/64, DVB-T & ATSC formats available
  • Fully IP Control and Network Management through browser
  • Front Panel LCD local control   
  • IPTV Output Unicast or Multicast IGMP UDP, RTP / RTSP
  • ASI Output multiplexer with cherry picking
  • Low Latency available 70-120ms
  • Dolby AC3 or MPEG1/2 Audio Encoding
  • MPEG2 or MPEG4 H.264 Video Encoding
  • Firmware for ATSC, DVB-T, DVB-S2 Available
  • VCT (Virtual Channel Table) support for DVB-C and ATSC
  • LCN (Logical Channel Number) support
  • 5 Years warranty

Model Selection

Additional Model Selection:

We can program our modulators to any available RF modulation format:

Changes in format  do not affect IPTV or ASI Output

QAM "Cable" DVB-C RF output
ATSC " Off Air " RF output
DVB-T  RF output


ISDB-T  RF output

*All Specifications Subject to Change Without Notice


4 HDMI & 4 YPbPr up to 1080P60 , 4 CVBS up to 480I

Supported Resolutions

1280x720P 60 / 59.94 / 50 Hz

1920x1080I 60 / 59.94 / 50 Hz 

1920x1080P 60 / 59.94 / 50 Hz

CVBS Input Supports 480I only

Video Codecs

MPEG-2 HD : 1.5-19.5 Mbps H.264 HD : 0.8-19.5 Mbps

Audio Codecs

 MPEG-1 Layer II Encoding
 MPEG-2 AAC Encoding
 MPEG-4 AAC Encoding

 AC3 Dolby Encoding


Support DD AC3 (2.0/5.1/7.1) passthrough for HDMI interface only

Audio Sample Rate

48 kHz

Audio Bit Rates

64 kbps, 96 kbps, 128 kbps, 192 kbps, 256 kbps, 320 kbps

Modulation Standard

QAM - J.83A, J.83B, J.83C.

Firmware for ATSC or DVB-T ISDBT available

RF Frequency Range

30-960 MHz 1 KHz Step

RF Power Level

5 - 35 dBmV Adjustable

DVB-ASI Output

BNC Connector: 1-60 Mbps



BNC Connector: 1-120 Mbps Programs Selected by PID Programs Muxed to all Outputs

IPTV Output

MPEG-TS MPTS over UDP, RTP/RTSP Unicas, and Multicast Supported

4 separate SPTS's

1 Muxed MPTS

Cables Included

Closed Captioning

1 to 4 HDMI Cables & Power Cord

CC 608 via Analog Input

Power Input

100-240 VAC Auto Switching
~ 20 W


19x17x3 19"Rack mountable 1U high


9 Pounds

Operating Temperature

32-110 F

Question and Answers
We were reanalyzing our current installation. We currently have an analog modulation while the options proposed are digital. We are planning to change from analog to digital but we need to make sure all needed equipment for the migration will be available. We have to distribute the signal in two separate building and we wanted to use the existing cabling if possible. The second building is receiving the signal by an RG 11 cable and we have 1 Signal Amplifier is installed in each building see the attached file for more details. We have the following Question? Can the signal from that modulator H-4ADHD-QAM-IPLL work with the attached line amplifier? If no How can we send the signal to an extension building located at 200m from the main modulator? Thank you for providing us clear explanation that will lead us to fine decision!

We are happy to hear that your project is moving forward, Using our HD HDMI modulator your video clarity will increase tremendously compared to the current analog modulated video. The Digital QAM is also an analog modulated signal, it just carries digital information, so you treat it the same way as the analog NTSC/PAL modulated RF. All of your infrastructures stays the same. You can even have both Analog and Digital on the same coax, we can generate any different frequency then you currently using for your analog and using simple 2x1 combiner you can have both at the same time. It will work fine over your 200m coax cable. If needed for the additional extension we have fiber optic RF to Fiber / Fiber to coax extender https://thorbroadcast.com/product/thor-optical-mini-catv-rf-transmitter-45-1000mhz.html
What is CC input means?

CC input means Closed captioning, the unit reads CC from Line 21 from CVBS baseband video input and encodes it into the stream. So for example, if you have DVD player with the HDMI and CVBS baseband video output, you can connect it to our unit bot of them and modulator will encode HD video from HDMI source and closed captioning form CVBS, the reason behind it is that HDMI doesn't carry CC as a separate signal data stream It is not necessary to use it is just an additional function, because of some costumes requires for the TV's where need to be muted.
One requirement of the system is to have minimum latency on the channels as these are used interactively on pan-tilt-zoom (PTZ) cameras, control of the DVRs and control of the satellite receiver channels. A long latency will cause the operator to "overshoot" the point they want when controlling the PTZ and similar problems with the entertainment DVRs and satellite receivers. We totally recognize there will be more delay with the digital system over the analog one but need to minimize the latency as much as possible. Iset Mode 1 but have been playing with the manual setting and hopefully found a setting that is acceptable. The manual is not too descriptive (page 34 of the PDF file) of the DTS Delay values and GOP values in the modes and normal. So I am not guessing on the values and have a starting point, if you could fill in the below table ASAP it would help in my installation this weekend, Thor Broadcast H-4ADHD ATSC Encoding Delay Settings Input Resolution Encoding Type Low Delay Mode DTS Delay Setting GOP Bframe Setting GOP P frame Setting Average Delay (ms) HDMI 1080i MPEG-2 Mode 1, HDMI 1080i MPEG-2 Mode 2, HDMI 1080i MPEG-2 Normal, HDMI 1080i H.264 Mode 1, HDMI 1080i H.264 Mode 2, HDMI 1080i H.264 Normal ,

I suggest setting mode2 @ 1080i to test. This is a better-balanced configuration. The main parameter affect encoding delay is the DTS setting. The minimum DTS value is 50, it could be set lower but it requires higher STB/TV decoding capacity. In mode2, the DTS value is about 150. Other parameters like GOP, B frames have an insignificant effect on the delay
We are in the process of migrating from analog RF cable tv to digital solution. The system is used for monitoring conductor etc, and the latency is a big issue. We are currently modulating 12 channels to ca 350 screens in wardrobes etc and the system is also used for the stage because the analog coax solution is close to zero latency. That is also the reason why it has been kept alive for so long. However, it’s not easy to find TVs with no/low latency anymore – even for analog RF. We are looking at SDI/SVSI/SDVoE for the stage area, but we won't look at DVB-C/T for the wardrobes where the latency is a little less critical. I see on your website that your modulators have a low latency option with 70 – 110ms and that is probably low enough for the wardrobes. Your modulators are only specified with DVB-T – will that work on physical coax? If not; do you have a DVB-C option/version?

All units you see on our website are available in all RF modulation standards; some units like the Thunder-4 and the Hybrid-8 have all standards built-in, so it's just a setting in the GUI, you can switch to DVB-C or DVB-T in just a few clicks. https://thorbroadcast.com/product/8-channel-hdmi-and-sdi-clear-catv-rf-modulator-qam-8230.html https://thorbroadcast.com/product/1-4-8-hdmi-digital-rf-encoder-modulator-full-hd-up-8230.html/238 Other units like the 4ADHD need to be ordered with specific modulation standard, they must be loaded with firmware to ensure proper standards are operational. Please let me know which model you were interested in and I will let you know if that model has expandable options or needs to be set up in advance with the proper firmware.
I guess the H-4ADHD-QAM-IP-LL (low latency?) would be the best choice for us then - giving us flexibility in the transition period. How many can be daisy-chained? And do you have units for analog RF? Or should we insert the H-4ADHD-QAM-IP-LL after the old analog system? Also; we have a text system for translation in all the seats in the venue and this system has a mirrored output on normal HDMI - can this be converted to Closed Caption? Alternatively, I will ask the vendor Marconi if the RS233 feed can be converted to the CC standard...

You can daisy chain as many units as you like, each unit would generate different channels, for example the first would generate ch 2,3,4,5 the second 6,7,8,9, We have 135 channels available, so in theory, we can combine 33 modulators, modulating on the different frequencies ( different channels). QAM channels are actually very similar to analog channels, they also occupy 6mhz band, so you can just replace analog or combine them together, so on the same coax you can have analog and digital modulating channels, when there are modulated on different frequencies, the frequencies for digital QAM and analog NTSC /PAL are the same Those ADHD models will output CC as well, it needs to be input via baseband video in the back of the unit alongside the HDMI input; the unit will encode the CC information onto the HDMI video and will output it on the RF channel. The CC inputs read recognize and read the Closed Captioning Line 21, so it would need to be provided in this format into the unit, and encode it as a CC608. this way the CC can be turned on /off on the TV level. You could also inject ( glue) the CC into actual video than it will be encoded the same time as a Video, but then it will be permanently displayed on Tv's all the time. In other words our unit needs to receive CC in form of the analog CVBS Video Line 21 in order to be encoded to CC 608
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