MCM Electronics

High Definition ATSC RF Modulator - Frequency Agile - HDMI Input By Stellar Labs (33-11980) MCM Part #33-11980

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MSRP: $399.95
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Frequency Agile ATSC RF Modulator
This product accepts a high definition HDMI AV signal and places it on a standard UHF television channel to be transmitted over 75Ω cable. HDMI material from a computer, DVD or Blu-Ray player, video game, HD video camera or similar source may be placed on any TV channel from CH14 through CH69. That signal may be combined with existing RF signals from outdoor television antennas or other ATSC modulators, set to different channels. Connections include HDMI input plus feedthrough output, and modulated RF output (female F) and loop through input. USB input is also provided allowing the playing of media files from thumb drives and similar storage devices, over the modulated output.

Specifications Top

  • Very simple intuitive operation
  • Front panel navigation with LCD display
  • Simultaneous readout of UHF channel number and frequency
  • HDMI input with loop output
  • Female “F” connector RF output
  • Female “F” combined input
  • Output frequency range: 473 ~ 803MHz (6MHz steps)
  • Output channel range: CH14 ~ CH69
  • Output signal strength: +25dBmV
  • Accepts resolutions up to 1080p
  • Output resolution: 720p

Specifications (general)
Video input Single HDMI with loop output
Input resolution Auto detect up to 1080p/60Hz
USB input Plays AVI and MOV from flash memory
Encoding mode MPEG2
Audio format MPEG-I Layer 2
Dimensions 1-3/8” (H) x 9-1/2” (W) x 4-3/4” (D)
Power requirements 5VDC, 2A - AC adapter included
HDMI Input
HDMI version V1.3HDCP 1.2
Transmission speed 10.2Gbps (max)
TDMS 0.5 ~ 1.5V p-p
DDC 5V p-p (TTL)
HDMI cable limit Input <5m (assumes 26AWG ver 1/3)
RF Output
Output format ATSC standard
Output signal strength +25dBmV
Output frequency Selectable 473 ~ 803MHz in 6MHz steps
Output channel Selectable UHF CH14 ~ CH69
Transmission mode 8VSB
Insertion loss <2dBm (from feedthrough antenna input)
Latency 100mS typical
Loop input/output Female “F” connectors
Part Numbers
MCM Part #:33-11980
Stellar Labs Part #:33-11980
Package Specifications & Dimensions
Weight:3 lbs.
RoHS Comp:No
Warranty:365 days
Need to Return?
Length:6 in.
Width:14.25 in.
Height:3.5 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No

Product Reviews Top

  • by daheath

    on 2/27/2017

    Works fine with some TVs but not all

    Overall: 3 out of 5

    I set it up for channel 56. I tried it with my Samsung, Panasonic, Vizio and LG TVs and it works fine. However, a Dish Network VIP722 with ATSC tuner completely fails. It shows up as channel 0.0 with name "Stella" but I haven't been able to actually receive the signal. If it was remapped I couldn't find it. If not for this issue I'd give it 5 stars.

  • by JHBrandt

    on 2/27/2017

    Needs some work, but not a bad deal for the price

    Overall: 3.5 out of 5

    I was hesitant to try this because I'd heard from others that it had problems with several receivers. But I tried it anyway, and I guess I got lucky because it works pretty well with most of the receivers I've tried it with so far:
    - An LG 32" TV
    - An old Dish Network DTVPal OTA DVR
    - A CM-7000Pal DVR (really the same product as above)
    - A HomeWorX HW-150 set top box/DVR
    - An old Philco converter box

    All of the above are HD-capable except the Philco converter box.

    I did have problems with an iView 3500STB (similar to the HomeWorX above, but older). I could watch the modulator's signal OK with the iView, but couldn't record it correctly. However, the Pal DVRs and HomeWorX do record the modulator's output and play it back OK.

    I also had problems with a Channel Master DVR+ (audio glitches about twice a second that make it unusable). However, the DVR+ worked OK as an *input* to the modulator, which is how I'll probably end up using it.

    Biggest problems I found were:
    - It constantly sends a time of midnight, which reset my receivers' clocks whenever I tune to it. This is a particular problem with the HomeWorX and iView because it disables timed recordings. If you use it with one of these boxes, make sure to tune to an actual OTA channel once you're done watching/recording, to reset the box to the correct actual time so any timed recordings you've set up will work.
    - Something's wrong with the channel map. If I set it to channel 69, my TV, iView, and HomeWorX find it as channel 69-4. But my Pal DVRs find it as channel 0-0 (then reassign it to a channel number of 7n-0 where n can vary from one box to the next). The Philco converter box was the only one that showed it as channel 69-1.

    It could be improved by giving the user a way to set the correct time, or failing that, just don't transmit a System Time Table so receivers won't reset their clocks to midnight. It would also be nice if there were a way to set your own virtual channel and subchannel numbers. And of course, the audio glitches with the DVR+ and some other receivers need to be fixed.

    It outputs a pretty robust signal. If you combine it with OTA signals as designed, make sure to put it *after* any preamps and/or distribution amps; ideally right before you split the signal up for various receivers.

    Some folks will find the resolution (720p @ 30 frames/sec) too low for their taste. (Most OTA HD broadcasts are 720p @ 60 frames/sec or 1080i @ 30 frames/sec). But the picture looks good enough for me, and the price can't be beat!

  • by leszek

    on 2/26/2017

    A unique product with one big flaw

    Overall: 3.5 out of 5

    This is an excellent device with one big flaw. The ATSC standard requires the VCT (virtual channel table) to be present in the transport stream. (the table that maps a physical channel 45 for example into a virtual 7.1) This device does not produce this table and therefore some TVs, tuners and computer software such as Windows Media Center will not be able to find and tune to the channels produced by this modulator. I hope this can be fixed in firmware and an updated firmware will be available for download here. Once that happens this will get 5 stars for quality/features.

  • by ditcheshurt

    on 1/29/2017

    Fleet of RasPI's broadcast throughout the house!

    Overall: 4.5 out of 5

    First, the mediocre - I had my wife's Apple TV connected to it but it was having very quiet audio glitches and only occasionally would the video seem like it was buffering (take into account, though, this is a very early generation Apple TV).

    Next, the mild irritant - The buttons could use some polish but they function. For something that I'll set, forget and leave running in a network closet 24/7 it's not a concern though. Also, if we could get a serial control port so as to be able to remotely change the tuner that would be awesome.

    Now for the good/great - I hooked a Raspberry Pi (model 1 B+) which is running KODI/OSMC and it works flawlessly. This was it's originally intended use, anyway. Now, I can move my RasPI into the basement and have it's video sent over my distributed OTA TV coax throughout the house and use the 'Kodi Remote' app on my phone.

    If you choose to use a similar set-up, to get the audio to work properly I had to deselect "Enable passthrough" on the "Audio and subtitle settings menu" (this was connected directly to a TV, however, so if your audio isn't working correctly play with "Stereo upmix" and "Enable passthrough" settings before asking questions or lodging complaints).

    It's the best value for the money. It does exactly what it says, no frills, just works.

    I'll be buying another in short order. Thanks MCM electronics and thank you Stellar Labs for making a stellar product.

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