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HDTV Encoder Modulators



4 Ch HDMI,YPbPr, CVBS to QAM, ASI & IP HD Encoder RF Modulator

Tech Specs
Application Drawing

QuestTel's HDMI QAM Modulators integrate high density hardware Mpeg2/H.264 encoder with QAM/ATSC modulator chassis system, which makes B-QAM-HDMI-IP-4CH the best solution for Live event broadcasting and professional Cable TV networking systems. Our HDMI to QAM core systems come with a big variety of features such as IPTV output and ASI mux, expanding amount of potential applications and adding flexibility to any pro AV system. Rack mountable enclosure allows you to stack many units together and with help of RF combiners generate your own channel lineups, which will be fully configurable, since B-QAM-HDMI-IP-4CH provides major support for all advanced channel settings such as VCT (Virtual Channel Table) and LCN (Logical Channel Number). QuestTel's modulators already have been picked by well known companies not only because our high performance encoders ensure 100% uptime and stability of the system, but also because they come with advanced support for low latency configutation, which is critically important to all live broadcasting appications. B-QAM-HDMI-IP-4CH has all functions required by TV stations, including DD AC3 Audio and dedicated analog 608 CC port with RCA.

Nowadays one of the most desired features by all pro AV companies is an IPTV support, our engineers put a lot of effort and time to come up with supreme IPTV circut, which completes a full set of features of QuestTel's encoder modulator systems, allowing you to stream ip video over both UDP and RTP protocols (multicast and unicast). The unit comes with two IP ports, second one is used to provide web console interface for configuration and management, which could be accessed remotely via LAN.

A key feature of B-QAM-HDMI-IP-4CH is an outstanding choise of inputs, such as HDMI, Composite and Component video, ASI and SPDIF audio. Furthermore, QuestTel's modulator chassis provides full supports for all modern cable television standards - DVB-C, ATSC, DVB-T and ISDB-T. Overall QuestTel's encoder modulators perfectly suit any professional AV company, including TV Channes, Live broacasters, AV Installers and Integrators, Government applications and many others.


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4 Ch HDMI,YPbPr, CVBS to QAM, ASI & IP HD Encoder RF Modulator

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    • Convert HDMI to HDTV DVB-C/DVB-T Channels
    • Video codecs - MPEG2 & MPEG4 AVC H.264
    • Audio codecs - DD AC3 (2.0), MPEG4-AAC, MPEG2-AAC, MPEG1 Layer II
    • Support DD AC3 (2.0 / 5.1 / 7.1) passthrough
    • CC (Closed Caption) EIA608 via CVBS
    • QAM, DVB-T & ATSC standards
    • IPTV Output UDP/RTP (unicast/multicast)
    • Low Latency modes for live video
    • VCT (Virtual Channel Table) and LCN (Logical Channel Number) support
    • ASI in and out for mux
    • Web console interface for management
Tech Specs
Encoding Section
Video Encoding MPEG2; MPEG4 AVC/H.264
Interface x4 HDMI/CVBS/YPbPr(RCA)
Resolution HDMI: 1920*1080_60p, 1920*1080_50p

(For MPEG 4 AVC/H.264 only),

YPbPr: 1920*1080_60i, 1920*1080_50i,

1280*720_60p, 1280*720_50p

CVBS: 720*576_50i, 720*480_60i

Aspect Ratio 4:3; 16:9
Audio Encoding MPEG1 Layer II; MPEG2-AAC; MPEG4-AAC; DD AC3(2.0);

DD AC3 (2.0/5.1/7.1) passthrough

Interface x4 HDMI/SPDIF (x2 Stereo/x4 Mono)
Sample rate 48KHz
Bit rate 64/96/128/192/256/320kbps


B-QAM-HDMI-IP-4CH Digital Encoder Modulator  Pdf User Manual: B-QAM-HDMI-IP-4CH


CATV QAM Channel Center Frequency  CATV QAM Channel Center Frequency 


ATSC Channel Center Frequency Chart  ATSC Channel Center Frequency Chart 


B-QAM-HDMI-IP-4CH HDMI Encoder Modulator Promo  4Ch HDMI QAM Modulator witth IP and ASI 

RF Section
MER ≥43dB
RF frequency 30~960MHz, 1KHz step
RF output level -30~ -10dbm (77~97 dbµV), 0.1db step
DVB-C Modulator Section 
Standard J.83A(DVB-C) J.83B J.83C
Constellation 16/32/64/128/ 256 QAM 64/ 256 QAM 64/ 256 QAM
Bandwidth 8M 6M 6M
RF Out 4*DVB-C adjacent carriers combined output
Symbol rate 5.000~9.000Msps adjustable
ATSC Modulator Section
Standard ATSC A/53
Constellation 8 VSB
RF Out 4*ATSC adjacent carriers combined output
Local interface LCD + control buttons
Remote management Web NMS
Stream Out

2 ASI out (BNC type, 100M);

out (RJ45, 100M)

NMS interface RJ45, 100M
Power supply AC 100V~240V
Dimensions 482*400*44mm
Weight 4.5 kg
Operation  temperature 0~45°C


Disclaimer: Products, specifications and data are subject to change without notice, to improve reliability, function, design or otherwise.




           Hotels & Resorts

  • Advertising Channels
  • Restaurant Menu Channel
  • Meeting Video Distribution
  • Local Information Channel
  • BAR Set Top Box Video Distribution
  • Overview Cameras Channels
  • Surveillance
  • Digital Signage


  • Patient TV Channels
  • Hard-Disk Recording surgery rooms
  • Student Training Broadcasting
  • HI-DEF conferencing
  • Training Channels
  • Surveillance/Monitoring
  • Digital Signage on existing CCTV systems

          Shops & Commercial Centers

  • Promotional TV channels
  • DVD BlueRay Players Video distribution
  • Internet Content distribution
  • HD/SD Video distribution via existing Coax
    Cables or via ON-AIR internal Broadcasting


  • Corporate TV Channels
  • Training Channels
  • VIP Entertainment Channels
  • Meeting(s) Video Distribution
  • Local Information Channel
  • Overview camera Channels
  • Surveillance

           Residences and Private Homes

  • HD Video distribution from any source to all
    chosen digital TVs, in every room or apartment
  • Centralized Video Surveillance, viewable on any TV
  • Centralized electricity, water, heating monitoring and
    control via a standard TV
  • HD Set Top Box and HD Player distribution to all TVs

          Schools and Campuses

  • Lessons/Courses broadcasting
  • Campus TV Channels
  • Info Channels
  • Courses Recording (IP to disk)



QuestTel shall have no liability for any error or damage of any kind resulting from the use of this document.
Application Drawing 4 Ch HDMI,YPbPr, CVBS to QAM, ASI & IP HD Encoder RF Modulator 's Application Drawing
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