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External SWM LNB / DTV OTA / Approved Diplexers

Discussion in 'DIRECTV Installation/MDU Discussion' started by chefwong, Jul 5, 2010.

  1. chefwong

    chefwong Legend

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    Jan 25, 2008
    What is a approved diplexer that works with the external SWM5LNB in conjuction with a AM21/HR21.

    Previous working setup was a SWM8/ Perfect Vision PVDP2PP ---- PVDP2PP/AM21/HR21. Both tuners on the HR21 and the AM21 OTA worked as they should.

    Today, they replaced the LNB on my dish to the SWM5LNB. With the Diplexer in the mix, it would not see Tuner 1 and have very low signal levels on Tuner 2.
    So just short of OTA....not in the mix, is there any new approved & or known working diplexers in a similar cable configuration that works ?

    http://www.dbstalk.com/showthread.php?t=180356
     
  2. NR4P

    NR4P Dad

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    Jan 15, 2007
    Sunny Florida
    By any chance did they replace your LNB because you ordered the Whole Home DVR service?

    If so, you cannot diplex OTA on that.
    Thought I'd check before you spend more $.
     
  3. chefwong

    chefwong Legend

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    Jan 25, 2008
    Nope. He replace it because I was getting signal issues. See other linked thread....
     
  4. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Dec 9, 2006
    "Short answer", there are no "approved" diplexers.
     
  5. chefwong

    chefwong Legend

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    Jan 25, 2008
    Is the *signaling* within the SWM8 I had different than the SWM5LNB ?

    Maybe as the old SWM8 did have a OTA port to diplex in ?
    However, I did not even out the rabbit ears coax in that but I had the diplexer on both ends of the runs.

    I know no diplexer is approved but is anyone running one in a similar working setup....
     
  6. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

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    Dec 9, 2006
    "The signaling" is the same. The receivers would have to reconfigure if it was different and they don't.
    "More than likely" the 2.3 MHz comm signal isn't getting through your diplexers.
    Now the sensitivity to this could be different between any two SWiM devices.
    You may need to use these: https://installeroasis.com/nas-std-9501-satellite-diplexer-for-directv-swim-2-pack-pr-160.html
     
  7. jdspencer

    jdspencer Hall Of Fame

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    Nov 7, 2003
    The bottom line is that a direct cable from OTA antenna to receiver is the best method. This eliminates insertion loss.
     
  8. chefwong

    chefwong Legend

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    Jan 25, 2008
    I've done OTA throughout the years in various configurations. Goes back to those $600+ Spaun switches.

    Granted there is the hi band - low band breakup (and I did read indepth past threads when I decided to do diplex one run which did work)....prior to this but I don't recall any frequency overlaps.

    There will always be insertion loss , whether it goes through a ground block etc....Mine comes straight off dish, to the SWM splitter, straight to the receivers. No wall plate as each receiver has a *cable rough in*, so the insertion loss is as minimal as I can see it can be ?
     
  9. chefwong

    chefwong Legend

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    Jan 25, 2008
    Just a quick update/thread bump.

    I had a service visit which ended up with a DVR replacement.
    Since it got me in the mood of DTV'ness.....I wanted to reexplore this and it's now working.


    What I was did wrong was I was diplexing past the splitter.

    The correct way was to diplex before even going into the swim splitter and all is well.
     

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