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DECA Diplexing Question

Discussion in 'DIRECTV HD DVR/Receiver Discussion' started by qcsatguy, Mar 18, 2010.

  1. qcsatguy

    qcsatguy Cool Member

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    Can a receiver's RF modulated output (channel 3) be diplexed onto coax with DECA? Has anyone tried this?
     
  2. BudShark

    BudShark New Member

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    No it can't. It would interfere. Its the same reason DECA does not allow OTA diplexing.
     
  3. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    While channel 3 isn't a problem, the diplexer(s) will be since they're going to also carry the 550 MHz DECA signal away from the cloud.
     
  4. qcsatguy

    qcsatguy Cool Member

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    Will the problem be at the mirrored tv where perhaps a DECA stop filter or other notch filter could be added?
     
  5. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    "The problem" will be at all diplexers, since the DECA signal will be going to the OTA [channel 3] port and not to [or between] the receivers.
    As you may know the diplexers have a common port OTA + SAT, and the other two ports are > 950 MHz & < 860 MHz. This means that the DECA won't feed the SAT port and will go out the OTA port.
     
  6. Beerstalker

    Beerstalker Hall Of Fame

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    My question is if you have DECA and MRV why would you be modulating a receivers output to channel 3 and diplexing it in?
     
  7. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    "Fixed it", since it can't be done. :lol:
     
  8. Grentz

    Grentz New Member

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    For other TVs that do not have a receiver on them?
     
  9. qcsatguy

    qcsatguy Cool Member

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    Thanks VOS, I understand, a tech just explained it to me and suggested using splitters instead of diplexers may work. I was thinking of splitting then diplexing DECA back in may work.
    The reason is to keep costs down by not adding more receivers at $5 a month.
     
  10. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Make sure you have/use a bandstop filter for the DECA, or you may end up doing something you don't want to the TVs.
    DECA levels are VERY HIGH.
     
  11. Beerstalker

    Beerstalker Hall Of Fame

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    Why not just have 2 RG6 runs to the receivers you want to modulate. One RG6 would be the SWM/DECA line to feed the sat receiver, and the other RG6 line would be the modulated channel 3 going back to your distribution center where you would split it and send it out to the TVs you want that receiver to feed.
     
  12. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    I've got to say this would be the best way.
    There would be just too many "gotchas" trying to do it otherwise.
     
  13. qcsatguy

    qcsatguy Cool Member

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    Not always possible or easy for install techs to run 2nd line.
     
  14. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    What exactly is your system?
    There must be an easier way.
     
  15. qcsatguy

    qcsatguy Cool Member

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    I've got Dish, but work for retailer that installs D*
    I agree 2 lines is best, but its not a perfect world.
     
  16. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    So you have none of this now.
    I'd still say you're trying to open up a can of worms.
    SWM frees up the 5-950 MHz band, but it needs to have 2.3 MHz between the receivers & the SWM/dish. Diplexing isn't recommended and you may find the 2.3 MHz comm signal gets lost if you do.
    I can work up some RF layouts to try what you want, but there are several "gotchas", so it may all be in vain.
    What do you have now with dish?
     
  17. qcsatguy

    qcsatguy Cool Member

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    I may just have to try wireless video senders although they cost more and I am unsure of the performance.
     
  18. qcsatguy

    qcsatguy Cool Member

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    Mar 12, 2005
    508
     
  19. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    I think I was looking for a bit more. :lol:
    How many cables/TVs/locations, etc.
     
  20. qcsatguy

    qcsatguy Cool Member

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    ota ant diplexed to 508 - 508 split to 2nd tv. My setup is easy to add cables to w/ open basement.
     

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