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Blonder Tongue MDDM-860 Micro ATSC/QAM to NTSC Audio Video Demodulator and Decoder

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Blonder Tongue MDDM Overview

The MDDM-860 Micro ATSC/QAM to NTSC Audio Video Demodulator and Decoder by Blonder Tongue receives one input signal in ATSC 8VSB (digital off-air) or QAM (digital cable) format and delivers one NTSC composite analog video and stereo audio output. The unit allows you to view a digital off-air program on an analog TV set. Headends processing analog broadcasts using Blonder Tongue’s MIDM demodulators and MICM modulators can be upgraded to process digital broadcasts by replacing the MIDM with a MDDM.

The unit features a front panel custom mini USB to RS232 interface connector for program control. The front panel provides up and down control channel selection and a two digit display to identify the program channel as well as a 1 digit RF channel display to indicate the frequency/channel plan.

  • 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 protection against ingress or egress
  • Adjustable picture sizes for 16:9 to 4:3 image conversion
  • Supports mono, stereo, and SAP audio modes
SKU: MDDM-860 Category: Tag:
Input
Connector
“F” female
Standards
8VSB: ATSC Digital Television Standard, A/53E
QAM: ITU-T J.83 (64 and 256 QAM)
8VSB Mode
Tuning Range: UHF (NTSC channels 14-78), VHF (NTSC channels 2-13)
Symbol Rate: 10.762 Msymbols/sec
Bandwidth: 6 MHz
QAM Mode
Tuning Range: CATV (NTSC channels 2-135)
Symbol Rate: 5.3606 Msymbols/sec (QAM 256); 5.057 Msymbols/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
12 dB
Impedance
75 Ω
Output
Connector
Video: “F” female
Audio: RCA; left & right
NTSC Composite Video
Level: 1 V peak-to-peak
Flatness: 1.0 dB p/v (30 Hz – 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
Analog Audio
Level: 1.0 – 1.2 V peak-to-peak (at -20 dBFs input), 10.0 – 10.5 V peak-to-peak (at 0 dBFs input)
Frequency Response: 2.0 dB p/v (30 Hz – 20 kHz)
Audio Signal-to-Noise Ratio: 67 dB (at -20 dBFs input)
Modes
Stereo, mono, SAP
Alarms/Monitoring/Control
Front Panel Indicators
Major program channel (2 digit LED display)
Minor program channel (1 digit LED display)
Channel scan (2 & 1 digit LED displays)
+100 Channel (red LED)
SNR (2- & 1-digit LED displays)
QAM LED (red LED)
No Lock (flashing QAM LED)
Picture size (2 & 1 digit LED displays)
Audio mode (2 & 1 digit LED displays)
Firmware revision (2 digit LED display)
Software revision (2 & 1 digit LED displays)
Unit reset (2 & 1 digit LED displays)
Front Panel Control
CH UP/DN push-buttons (increment major or minor channel up/down)
ENT push-button (enters or confirms selection)
SCAN push & hold-button (initiates channel scan)
PIC SIZE push-button (adjusts picture size/aspect ratio)
AUD MODE push-button (adjusts audio mode and closed captioning)
SNR push-button (measures input signal-to-noise ratio)
QAM/8VSB push & hold-button (toggles between QAM & 8VSB)
ENT & SNR simultaneously (stops scan at anytime)
PIC SIZE & AUD MODE simultaneously (unit reset)
PROG MON (custom mini USB-to-RS232 interface for control & monitoring)
General
Power
110 VAC, 60 Hz or 220 VAC, 50 Hz
Power Dissipation
7 W (per MDDM module)
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
Dimensions
1.15 x 7.50 x 3.50″ (2.92 x 19.05 x 8.89 cm)
Weight
0.8 lb (0.36 kg)
Packaging Info
Package Weight
0.9 lb
Box Dimensions (LxWxH)
10.472 x 4.252 x 1.339″

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