1.888.902.3309 LIVE CHAT

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

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

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

  • Brand
    Blonder Tongue
  • SKU
  • Weight
    3.00 lbs
  • Warranty
    1 Year
  • Condition
  • Status
Product Questions? Ask Our Experts!
In stock (50 items available)
HE-12 & HE-4 Series ATSC/QAM Demodulator. Demodulates digital signals for analog distribution
  • Brand
    Blonder Tongue
  • SKU
  • Weight
    3.00 lbs
  • Warranty
    1 Year
  • Condition
  • Status
Questions? Ask our experts!


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.

  • 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
    • 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 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); 5.057 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
      • 12dB
    • Impedance
      • 75?
  • 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
    • 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
  • 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 Monitoring/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)
Free Ground Shipping
We offer free ground shipping on every purchase of $300 and more for US and US territory. Please choose "Free Ground Shipping (UPS/USPS)" option at checkout.

UPS Ground
UPS provides up-to-date tracking information. Ground service takes anywhere from 2-7 working days for delivery depending on destinations.UPS Ground does not deliver on Saturdays, Sundays or Holidays.

USPS Priority Mail/USPS Express Mail For all shipments shipped via USPS, we offer 'DELIVERY CONFIRMATION' number with each package. Difference between tracking number provided by UPS vs USPS Delivery Confirmation number is: Delivery Confirmation status is updated when the delivery has been made or when the package has made it through major USPS stations.

Air Shipment
Air shipments, Overnight, 2nd day and 3 day select methods offer guaranteed delivery time for your shipment. If you are in hurry or in need for the items on schedule, select one of these methods. Up-to-date tracking information is provided with each Air Shipment. AVProSupply has the right to choose between Air shipments to meet or reduce delivery time. For guaranteed delivery of multiple items with expedited shipping, please contact our customer service representative for personalized assistance to get your items delivered to you when you need them.

International Customers
We offer shipping via USPS/UPS for our international customers. You can find different shipping options during checkout.

Most items ordered from AVProSupply will be shipped out from our California Warehouse. Will-Calls are only allowed with Appointment Only - Please call Customer Service to set one up between the hours of 9am to 6pm PST.


Major Credit Cards: Visa, MasterCard, Discover and American Express.
Paypal: You can select an option of Paying with Paypal in our shopping cart.
Money orders: and personal checks or company checks (may take up to 10 days to clear).
Wire Transfer: ( Bank Transfer ) Only for the amount over $500. Contact us for the bank details.
Phone Orders: To place a phone order please call 1.888.902.3309 or 1.916.246.6264 and one of our Customer Service Representatives will take your order (8:00am - 6.00pm PST).

Purchase order: Fax purchase orders to 1.916.672.2557

We Offer A 30-Day Money Back Guarantee: 
Our main goal is to ensure your complete satisfaction with our service and products. If, for any reason, you are not 100% satisfied with your purchase, you can return it within 30 days of the purchase date for a full refund. Our 30-day money back guarantee applies to all of the products we sell, except for: TVs and monitors 20" and larger, Special Order merchandise, or any item indicated as non-returnable. Shipping is not refundable. Prior to returning your purchase, a Return Merchandise Authorization (RMA) number will be provided to you.

Refunds on returned items will be issued in the same payment form as received from the customer at the time of purchase. Once we receive the product and it passes inspection, we will credit your account. Please allow 3 - 6 business days for a credit to appear on your account.

If the item was sent back to us for an exchange, please allow 3 - 5 business days for the replacement to be processed.

No Returns/Exchanges on the following:

TVs and monitors 20" and larger
Special Order merchandise
Any item indicated on the website as non-returnable

For more information see our official Return Policy

  • Shipping Info
    We offer free ground shipping on every purchase of $300 and more for US and US territory. We deliver worldwide.
  • Payment Methods

  • Return Policy
    We Offer a 30-Day Money Back Guarantee