RF input to RF output Transmodulator - DVB-S/S2, QAM, ATSC, DVB-T

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Description Features Drawings Model Selection Specification Q&A Documents Support
DVBS/S2 to DVB-T model description
H-4-DVBS2-DVB-T - 4 satellite channels (frequencies) to DVB-Ttrans- modulator, + IP, ASI

Multi-input CATV QAM / ATSC / DVB-S2 / ISDB-T trans Modulator with IP Out

Inputs are :

  • 4 RF Tuners : DVB-S/S2 or QAM or DVB-T or ATSC
  • 2 ASI Inputs  

Outputs are:

  • 2 RF carriers : QAM or ATSC or DVB-T or ISDB-T
  • 2 ASI’s Output
  • MPTS IP Output

Thor Broadcast Transmodulation systems are a 4 RF input modulator and program stream multiplexer with CAM support via 4 CI slots. They are available for QAM (DVB-C), Satellite (DVB-S/S2), and terrestrial (ATSC)(DVB-T) radio frequency RF signal sources. RF signal types can easily be interchanged by removing the modules(you can not upload firmware to change the modulation functionality, this is hardware based). Full configuration and management is available on the front panel LCD and keypad, and remote access and monitoring is available on a dedicated NMS network port for control through a web browser. Program streams available as well as the IP and ASI inputs can be multiplexed and remapped in any order. Independent output pipes for both ASI and IP are fully configurable.  Industry standard support for Conditional Access is provided by 4 Common Interface (CI) slots. These slots support CAM modules such as CableCard or any other system using the PCMCIA interface. This platform is ideal for program aggregation and multiplexing in cable TV headends and corporate MATV systems.

  • Modulate 4 RF carriers including all sub programs and streams
  • Provides industry standard multiplexed and remapped outputs on ASI & IP
  • 9x IP stream outputs (8 SPTS, 1 MPTS) in UDP, RTP, or RTSP video protocols
  • Advanced network managment system on dedicated network port and IP address
  • Modulator available in QAM (DVB-C), Satellite (DVB-S2) or OTA (DVB-T) -- (model dependant)
  • Supports Closed Caption 608 and 708 systems, supports Dolby AC/3 Pass Through
  • H-4-DVBS2-QAM      4 satellite LNB’s RF + 2 ASI’s to QAM and IP
  • H-4ATSC-QAM-IPLL   4 ATSC RF +2 ASI’s to QAM and IP
Model Selection

H-4-ATSC-QAM  - 4 OFF  AIR  ATSC channels (frequencies)  to CATV QAM , IP, ASI

H-4-DVBS2-QAM  - 4 satellite  channels (frequencies)  to CATV QAM , IP, ASI

H-4-DVB-T-QAM  -  4 OFF  AIR  DVB-T channels (frequencies)  to CATV  QAM , IP, ASI

H-4-ATSC-ATSC -  4 OFF  AIR  ATSC channels (frequencies)  to ATSC trans - modulator, + IP +ASI

H-4-DVBT-QAM -  4 OFF  AIR  DVB-T channels (frequencies)  to QAM trans- modulator, + IP, ASI

H-4-DVBS2-ATSC -  4 satellite channels (frequencies)  to ATSC trans- modulator, + IP, ASI

H-4-DVBS2-DVBT -  4 satellite channels (frequencies)  to DVB-T trans- modulator, + IP, ASI

H-4-DVBS2-ISDB-T -  4 satellite channels (frequencies)  to ISDB-T trans- modulator, + IP, ASI


The Need for RF Standard Transmodulators in ATSC to QAM, DVB-S2 to QAM, and DVB-S2 to ATSC Conversions

In the ever-evolving landscape of digital broadcasting, the demand for versatile and adaptive solutions has become paramount. One such solution that plays a pivotal role in meeting this demand is the RF standard transmodulator. This article explores the compelling reasons behind the necessity for RF standard transmodulators, particularly focusing on the conversions from ATSC to QAM, DVB-S2 to QAM, and DVB-S2 to ATSC.

The Dynamics of Broadcast Standards

Broadcasters encounter diverse standards when delivering content to viewers. ATSC and QAM represent different modulation schemes used in North America, each with its unique characteristics. On the other hand, DVB-S2 is a standard used for satellite broadcasting, and the need arises to seamlessly integrate satellite signals into cable networks.

Case Study: ATSC to QAM Transmodulation

Consider a scenario where a broadcaster operates with an ATSC standard but wishes to extend the reach of their content to cable subscribers using QAM modulation. An RF standard transmodulator serves as the bridge, converting the ATSC signal into QAM without compromising quality. This flexibility allows broadcasters to cater to a wider audience and explore new markets without the need for extensive infrastructure changes.

Case Study: DVB-S2 to QAM Transmodulation

Satellite broadcasters face a similar challenge when aiming to deliver content to cable subscribers. By employing an RF standard transmodulator, the DVB-S2 satellite signal can be seamlessly transmodulated into QAM for cable distribution. This conversion preserves the integrity of the signal, ensuring that viewers receive a high-quality and reliable broadcast experience.

Case Study: DVB-S2 to ATSC Transmodulation

In some instances, broadcasters may want to integrate satellite content into an ATSC-based system. Here, the RF standard transmodulator becomes a crucial tool for converting DVB-S2 satellite signals to the ATSC standard. This enables a seamless integration of satellite programming into terrestrial networks, providing broadcasters with the flexibility to offer diverse content to their audience.

Key Benefits of RF Standard Transmodulators

  1. Versatility: RF standard transmodulators offer unparalleled versatility by facilitating seamless conversions between different broadcast standards, allowing broadcasters to adapt to evolving market demands.

  2. Cost-Effective Solutions: Instead of investing in entirely new infrastructure, transmodulation provides a cost-effective solution to extend the reach of content across different platforms.

  3. Preservation of Signal Quality: These transmodulators are designed to maintain the integrity and quality of the original signal during the conversion process, ensuring a superior viewing experience for end-users.


In a landscape where content delivery standards vary, RF standard transmodulators emerge as indispensable tools for broadcasters seeking to expand their reach and diversify their content distribution. The case studies of ATSC to QAM, DVB-S2 to QAM, and DVB-S2 to ATSC conversions illustrate the practicality and benefits of these transmodulation solutions. As the broadcasting industry continues to evolve, RF standard transmodulators stand as key enablers, providing broadcasters with the flexibility needed to navigate the complexities of modern content distribution.



4 S/S2 Tuner and 2 ASI input

Tuner Section



Input Frequency


Symbol rate


Signal Strength


FEC Demodulation

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


Input Frequency


Symbol rate

QPSK 1~45Mbauds

8PSK 2~30Mbauds

Code rate

1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9, 9/10

Demodulation Mode




Input Frequency










Maximum PID Remapping

128per input channel


PID remapping (automatically or manually)

Accurate PCR adjusting

Generate PSI/SI table automatically




J.83A, J.83B, J.83C



RF frequency

30~950MHz, 1KHz step

RF output level

-30.0~ 0.0 dbm (77~107 dbµV), 0.1db step

Symbol rate

2.5 – 4.66 Msps, 5.0 - 8.0 Msps








64QAM, 256QAM





64QAM, 256QAM




Local interface

LCD + control buttons

Remote management


Stream Out

2 ASI out(BNC type)

IP (4*MPTS over UDP) out (RJ45, 1000M) UDP.RTP,RTSP


Web and USB







0~45(Operation) ; -20~80(Storage)


AC 100V±1050/60Hz; AC 220V±10%, 50/60HZ



Question and Answers
Yes you have the correct parts to do that, or you can use the H-4HD-EMS to convert to IP, and the 4x V3-IRD-IP to convert from IP back to SDI. 
If you want to use the coax, then the H-4SDI-QAM-IPLL to create 4 RF channels, then 4x the V3-IRD-QAM to convert from QAM to SDI.  
 Latency would be about 2 seconds more than likely going the IP route; if you convert to RF it would be slightly faster, about 500ms 
I know it would not be ideal, but the easiest solution would be to use a single strand of fiber between the locations:
Zero Latency, uncompressed 4x 3G-SDI over one Fiber
Minimal latency, compressed 4x HD-SDI over one Fiber

If you need to modulate 5 programs on one ATSC RF channel, I would recommend
2pcs H-4ADHD-ATSC-IPLL connected together via ASI

The H-4ADHD is a 4 ch HDMI encoder/ ATSC modulator with ASI input and
ASI output, unit has a TS multiplexer built into it.
You can use the first one to produce 4TS. and you can bring the 5th
from the second unit via ASI from the second unit.

I would like to know that In order to fit 5 TS programs into one ATSC
frequency, they would need to be encoded at 19/5 = 3.8Mbps which is a
a little low for decent video quality in MPEG2 encoding, which you must
use for of the air transmission

Currently, the H-4-ATSC-ATSC is no available longer, the only
unit that can be used as a translator is:
H-16ATSC-IP-16ATSC : 16 ATSC to 16 ATSC and IP out

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