12 HD/SD-3G SDI with 608/708CC (Closed Captioning) CATV RF MODULATOR

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Description Features Drawings Model Selection Specification Q&A Documents Support
QAM model description
12 HD/SD-3G SDI input to CATV QAM (CABLE TV) RF Output and IPTV output. PN : H-12SDI-QAM-IPLL

CATV Digital Modulator with 12 SDI Input + ATSC/QAM RF INPUT, IPTV TS INPUT and CATV RF COAX Output + IPTV TS output +  ASI output - LOW LATENCY - UP to 1080p/60

12 SDI to CATV RF Modulator and IP Video Encoder - Thor Broadcast new high density HD encoder RF modulator has an all new platform for modulation for up to 12 SDI Inputs in SD/HD/3G-SDI sources while simultaneously being able to output IP Transport Streams from those sources. This multi-function device is a professional headend in a box with massive functionality which includes encoding, multiplexing, scrambling and modulation.


  • It supports up to 12 SDI with Closed Caption inputs
  • 1 RF TUNER - ATSC or QAM per request
  • 256 IP input through Data1 (GE) port.


  • 16 Channels RF out with 16 non-adjacent carries  + 16 MPTS  IPTV streams which mirror the 16 RF carriers

Combining several of these units means you can utlimately build a full headend in a fraction of the rack space. This unit is a 1RU powerhouse that has surpassed testing expectations due to utilization of the best video chipsets on the market which means perfect 1080p60 clarity in beautiful HD. By using only the highest quality components internally, Thor's quality in Television RF modulation has once again exceeded expectations in Hotels, Stadiums, Malls, Theatres, Hospitals, US Military, Universities, etc


SDI Multiplexer

The Thor Broadcast SDI modulators vary for maximum SDI inputs, but each modulator can also work as a video multiplexer.

Easily combine multiple programs on a single RF Frequency. Depending of the video bit-rate, you can put several TV programs on one frequency(6mhz step). On DVB-C 265QAM, each 6Mhz channel contains 38Mbps data. So, if the encoding bit rate is 9Mbps, we can fit 4 videos on one physical channel, for this means we can create 4 programs in one RF channel eg: 7.1, 7.2, 7.3, 7.4, also by using VCT -Virtual channel setting, we can assign any static channel a  more friendly number in which will be displayed on the TV's.

This flexibility of packing in more programs per RF QAM256 means you can utilize less channels in your RF spectrum, and by using VCT you can create whole number channels and put them anywhere you want in your channel CATV lineup.


  • 12 HD-SDI inputs with MPEG2 & MPEG4 AVC/H.264 Encoding
  • 1 RF tuner input for re-mux  The tuner - base model support ATSC but QAM or DVB-T or ISDB-T tuner could be requested
  • 256 IP(DATA1 port only) input over UDP and RTP protocol
  • MPEG1 Layer II, MPEG2-AAC, MPEG4-AAC, Dolby Digital AC3 (2.0) encoding AC3 (2.0/5.1) passthrough
  • 16 groups multiplexing /Scrambling/ DVB-C QAM or ATSC  modulating
  • 8 groups multiplexing / DVB-T modulating---Optional
  • 16 MPTS IP (DATA2 port only) output over UDP, RTP/RTSP
  • 8 MPTS IP (DATA2 port only) output over UDP, RTP/RTSP--only for DVB-T RF out
  • PID remapping/ accurate PCR adjusting/PSI/SI editing and inserting
  • Control via web management
  • Lowest cost per channel, breakthrough price

Model Selection
  • H-12SDI-QAM-IPLL  - 12 SDI input to 16 CATV RF QAM (CABLE) Modulation Output and IPTV output -Low Latency
  • H-12SDI-ATSC-IPLL - 12 SDI input to 8 CATV RF ATSC OFF AIR Modulation Output and IPTV output -Low Latency
  • H-12SDI-DVBT-IPLL - 12 SDI input to 8 CATV RF DVB-T OFF AIR Modulation Output and IPTV output -Low Latency
  • H-12SDI-ISDBT-IPLL - 12 SDI input to 8 CATV RF ISDB-T OFF AIR Modulation Output and IPTV output -Low Latency


12 HD-SDI inputs with CC

1 ATSC  or  (DVB-C QAM optional)Tuner for re-mux, F type interface

256 IP input over UDP and RTP, DATA1, RJ45




1920*1080_60p, 1920*1080_50p,1920*1080_60i, 1920*1080_50i, 1280*720_60p, 1280*720_50P,

720*480_60i, 720*576_50i


1920*1080_60p, 1920*1080_50p,1920*1080_60i, 1920*1080_50i, 1440*1080_60i, 1440*1080_50i,

1280*720_60p, 1280*720_50P, 720*576_50p,

720*576_50i, 720*576_30p, 720*576_25p,

720*480_60p, 720*480_60i,720*480_30p, 720*480_25p,320*240_60p,320*240_50p,

320*240_30p, 320*240_25p,320*180_60p, 320*180_50p, 320*180_30p, 320*180_25p,

960*540_50i, 704*576_50i,704*480_60i, 640*576_50i

640*480_60i, 544*576_50i,544*480_60i,




0.8~19Mbps for H.264 encoding

1~19Mbps for MPEG-2 encoding

Rate Control


GOP Structure

GOP B Frame: 0-3, GOP P Frame: 0-6

Advanced Pretreatment

De-interlacing, noise reduction




Dolby Digital AC3 (2.0) encoding,

AC3 (2.0/5.1) pass through

Sampling rate





64Kbps-320kbps each channel


Maximum PID


256 input per channel


PID remapping (automatically or manually)

Accurate PCR adjusting

Generate PSI/ SI table automatically


Maximum simulcrypt CA



EN300 429/ITU-T J.83A/B


Local/remote connection









QAM Channel: 16 non-adjacent carriers output (maximum bandwidth 192MHz)

Standard: EN300 429/ITU-T J.83A/B

MER: ≥40db

RF frequency: 50~960MHz, 1KHz step

RF output level: -20~+10dbm (87~107 dbµV), 0.1db step

Symbol Rate: 5.0Msps~7.0Msps, 1ksps stepping

Constellation: 16/32/64/128/256QAM






64/256 QAM







FFT mode

2K, 4K, 8K


6M, 7M, 8M



Guard Interval

1/4, 1/8, 1/16, 1/32


1/2, 2/3, 3/4, 5/6, 7/8


≥42 dB

RF frequency

50~960MHz, 1KHz step

RF out

8*RF COFDM DVB-T out (8 carriers combined output)

RF output level

-20~+10 dBm (77~97 dbµV), 0.1db step

Stream output

RF output (F type interface)

16 MPTS output over UDP and RTP/RTSP as mirror of 16 DVB-C carriers,

8 MPTS output over UDP and RTP/RTSP as mirror of 8 DVB-T carriers(model dependent)

1*1000M Base-T Ethernet interface

System function

Network management (WEB)

English language

Ethernet software upgrade


Dimension (W×L×H)

482mm×440mm×44mm 1RU Rackmount

Approx weight 



0~45°C(work); -20~80°C (Storage)

Power requirements  

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

Power consumption 


Question and Answers
Sounds like you have a few things going on here. Each SDI input on this unit can carry 2 channels of audio; so you're fine there. If you want to have zero-latency, then you need forgo encoders and go straight over fiber to monitors. using SDI over fiber converters like this one : https://thorbroadcast.com/product/1-sdi-hdsdi-over-fiber-mini-extender.html Encoders will always have latency, however, things like resolution and infrastructure are the biggest causes of latency. We use the best chipsets on the market in these units, there is nothing faster, I can have an engineer give you a call and explain in detail if you like. That being said you'd probably be looking at from anywhere from 250-350ms based on what you have above. If you have CCTV camera's that are SDI, then you would use our modulator to convert to RF. If you have IP cameras and want to convert to RF, you would need something different, we have converters for that as well https://thorbroadcast.com/product/iptv-to-16-32-clear-channel-rf-qam-atsc-modulator.html/122 I'm kind of curious why you implemented both SDI and IP camera's; I think this may cause some differences in real-time transmission of those signals because of the conversion thereafter.
User's Manual is avalible only for logged users.
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