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HDTV Encoder Modulators



4 Ch HD-SDI to QAM, ASI & IP HD Encoder RF Modulator

Tech Specs
Application Drawing

QuestTel's SDI QAM Modulator series is a reliable solution for live video applications and high-end video systems. B-QAM-SDI-IP-4CH-LL integrates hardware encoder module and professional RF QAM (ATSC/DVB-T Optional) modulator chassis into a single box, allowing you to broadcast video on the web and distribute it over cable TV network simultaneously. Encoder module is specially designed to deliver superior image quality and stable performance, the module supports both MPEG-2 and H.264 codecs as well any resolution up to 1080p@60 (3G-SDI). Modular architecture of the unit allows us to install different video input cards ranging from SDI to HDMI, YPbPr and CVBS. Our modulators comply with all modern broadcast technologies and provide a great support for different video inputs such as SDI (HDMI available) and ASI. B-QAM-SDI-IP-4CH-LL is a good choice for any broadband company since our systems are fully complaint with all strict broadcasting standards and support closed captioning 608 / 708 as well as AC3 audio. B-QAM-SDI-IP-4CH-LL is also equipped with two ASI outputs, which increase scalability of your AV system. Management made easy with integrated network management system, which allows you to control the unit remotely via web browser. B-QAM-SDI-IP-4CH-LL is engineered for cable TV signal distribution over existing coaxial cables to unlimited number of TVs as well as IPTV broadcasting over UDP, RTP/RTSP. Overall B-QAM-SDI-IP-4CH-LL has all advanced broadcasting features and provides great support for HD video inputs, while performing high quality encoding and solid modulation.

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4 Ch HD-SDI  to  QAM, ASI & IP HD Encoder RF Modulator

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    • MPEG2 & MPEG4 AVC/H.264 HD/SD encoding
    • Huge video buffer (for SDI interface), free to switch video sources
    • MPEG1 Layer II, MPEG2-AAC, MPEG4-AAC, AC3 2.0 audio encoding
    • Up to 1920*1080@50P/60P supported (MPEG4 AVC/H.264)
    • Up to 1920*1080@50I/60I supported (MPEG2 HD)
    • 4* HD-SDI or HDMI inputs
    • 1*ASI input for re-mux; 1*RF input for mix
    • Support CC (closed caption ) for SDI interface
    • Simultaneously encoding each channel 19 Mbps
    • DVB-C/DVB-T/ATSC-T/ISDB-T(Optional) RF Input 
    • RF out (DVB-C/T/ATSC/ISDB-T RF Optional) and ASI out / IP out
    • Support 4 * SPTS output
    • Extremely low delay
    • LCN support (Logical Channel Number)
    • Excellent modulation quality MER≥42dB
    • RF Frequency range 30Mhz~960Mhz
    • LCD display, Remote control and firmware
    • Web NMS management; Updates via web
    • Lowest cost per channel
Tech Specs
Encoding Section
Video Encoding MPEG2; MPEG4 AVC/H.264
Interface x4 SDI(BNC)
Resolution SDI: 1920*1080_60p, 1920*1080_50p

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

1920*1080_60i, 1920*1080_50i,

1280*720_60p, 1280*720_50p

720*576_50i, 720*480_60i

Low Delay Normal, Mode 1, Mode 2
Audio Encoding MPEG1 Layer II; MPEG2-AAC; MPEG4-AAC; DD AC3(2.0)
Sample rate 48KHz
Bit rate 64/96/128/192/256/320kbps


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


CATV QAM Channel Center Frequency  CATV QAM Channel Center Frequency 


RF Section
MER ≥42dB
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 x ASI out (BNC type, 100M);

out (RJ45, 100M)

NMS interface RJ45, 100M
Power supply AC 100V~240V
Dimensions 420x400x44mm
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.

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