Blonder-Tongue MDDM-860 HE-12 and HE-4 Series ATSC/QAM Demodulator

The MDDM-860 is a digital demodulator and decoder that receives one input in ATSC 8VSB (digital off-air) or “clear” QAM (digital cable) format and delivers one NTSC composite analog video and stereo audio output. The unit allows delivering of a digital off-air program to viewers with an analog TV set. It also allows operators to cherry-pick channels from a clear QAM cable lineup. Headends processing analog broadcasts using Blonder Tongue’s MIDM demodulators and MICM modulators can be upgraded seamlessly to process digital broadcasts by simply replacing the MIDM with a MDDM.

Features:

• Compact design allows for deployment of 6 channels (6 MDDM modules + 6 MICM modulators) in 2RU
• NTSC Composite Analog Video output is in 480i format and supports Closed Captioning (EIA-608)
• Input standards supported are digital off-air (8VSB) and digital cable (ITU-B QAM 64 and 256)
• Scans all 8VSB or QAM channels and stores in memory for quick channel selection
• Demodulates HDTV/SDTV digital signals to NTSC video and analog L/R audio
• On-site firmware updates/status monitoring available through front-panel
• Die-cast Chassis Offers Superior Protection against Ingress or Egress
• Adjustable picture sizes for 16:9 to 4:3 image conversion
• Supports Mono, Stereo, and SAP audio modes

Specifications:

• INPUT:
  • Connector: “F” Female
  • Standards:
    • 8VSB
    • ATSC DigitalTelevision Standard A/53E
    • QAM
    • ITU-T J.83 (64 and 256 QAM)
  • 8VSB Mode:
    • Tuning Range - UHF (NTSC Ch. 14-78), VHF(NTSC Ch. 2-13)
    • Symbol Rate - 10.762 Msymbols/sec
    • Bandwidth - 6 MHz
  • QAM Mode:
    • Tuning Range - CATV (NTSC Ch. 2-135)
    • Symbol Rate - 5.3606 Msymbols/sec (QAM 256); 5.057Msymbols/sec (QAM 64) – Auto Detect
    • Bandwidth - 6 MHz
  • Single Channel Power Level: -32 to +45 dBmV
  • 8VSB Power Level: -20 to +30 dBmV
  • QAM Power Level: -20 to +20 dBmV
  • Return Loss: 12dB
  • Impedance: 75 ohm
• OUTPUT:
  • Connector:
    • Video: “F” Female
    • Audio: RCA; Left & Right
  • NTSC Composite Video:
    • Level: 1 Volt Peak-to-Peak
    • Flatness: 1.0 dB p/v (30 Hz to 4.2 MHz)
    • Video to Noise Ratio: 70 dB
    • Differential Gain: ± 0.75%
    • Differential Phase: ± 0.50 degree
    • Format: 480i
    • Aspect Ratio: AFD, Center Cut, Letterbox,Full, Zoom 1, Zoom 2
    • Closed Captioning: EIA-608
  • L/R Analog Audio:
    • Level: 1.0 to 1.2 Volt Peak-to-Peak(at -20 dBFs input), 10.0 to 10.5 Volt Peak-to-Peak (at 0 dBFs input)
    • Frequency Response: 2.0 dB p/v (30 Hz to 20 KHz)
    • Audio Signal-to-Noise Ratio: 67 dB (at -20 dBFs input)
  • Modes: Stereo, Mono, SAP
• GENERAL:
  • Dimensions (W x D x H): 1.15 x 7.5 x 3.5 inches (29 x 191 x 89 mm)
  • Power: 110 VAC/60 Hz or 220 VAC/50 Hz
  • Power Dissipation: 7 W (per MDDM module)
  • Weight: 0.8 lbs (0.36 kg)
  • Operating Temperature: 32 to 122 °F (0 to 50 °C)
  • Storage Temperature: -13 to 158 °F (-25 to 70 °C)
  • Operating Humidity: 0 to 95% RH @ 35 °C max, non-condensation
  • Storage Humidity: 0 to 95% RH @ 35 °C max, non-condensation