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HR34 / SWM 16 / 771A Issues

Discussion in 'DIRECTV Installation/MDU Discussion' started by Ranman, May 25, 2012.

  1. Ranman

    Ranman New Member

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    May 24, 2012
    Hey everyone. My system was recently upgraded to a SWM 16 system and I've added an HR34-700. Other receivers are HR24-100, R16-500 (only 1 tuner in use), D12-700.

    During the SWM 16 upgrade, there was no close AC outlet, so the installer ran a coax and installed the PI about 25' away. Also, I had somewhat of a rats nest in my basement from the previous install, etc.

    I've recently mounted a plywood board to my basement wall and have tried to "clean" up the install. (I also mounted my phone distribution and am in the process of installing an Elk M1 Gold security / automation system.

    Anyway, during the DTV install cleanup effort, the major change was bringing the PI much closer and mounting it, Since then, I've been experiencing some 771A errors on my HR34 unit. This receiver is closest to the SWM with an estimated 30' of coax through a wall plate and barrels, and the longest run (the R16) is maybe 50' 60' of coax tops.

    I've done some reading and now understand that the D* "standard" (2) X 8 output splitter setup is less than ideal. I may choose to run the HR34 and the D12 on a two-way splitter and the HR24 and R16 on a four-way split to reduce insertion loss. That said, I'm stillsomewhat surprised I'm having the 771A issues given the "short" coax runs and only one -18dB loss device.

    After reading a VOS thread, I powered everything down, moved the HR34 from SWM2 to SWM1 and two of the other receivers over to SWM2 just to make a change. I then brought the SWM back up and then brought the HR34 up first (even though it's closest) to get it on the low channels (SWM2). Next was the R16 (furthest), HR24 (nest in distance) and finally the D12 (closest excluding the HR34) Other than the HR34, I'm not exactly sure which receiver is on which SWM exactly. Everything seems to be running well now, but I still have some concerns of a sub-optimal system as all receivers should work well regardless of SWM channel.

    I am attaching a photo of my setup. If anyone would care to comment on the configuration or other details or seen issues, I would appreciate the feedback. Thanks so much for taking the time to read and respond.

    ~R
     

    Attached Files:

  2. veryoldschool

    veryoldschool Lifetime Achiever DBSTalk Club

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    Dec 9, 2006
    The top splitter doesn't have one of the outputs terminated, which should be.
     
  3. webby_s

    webby_s Hall Of Fame

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    Jan 11, 2008
    And for VOS to only say that much (bad) about your set-up is darn near the highest compliment!!!! VOS knows his stuff!

    You have a very clean and neat set-up!

    So you are not getting the 771a since this was redone?
     
  4. HoTat2

    HoTat2 Hall Of Fame

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    Nov 16, 2005
    Los...
    Why is the R16 setup for only one tuner?
     
  5. Ranman

    Ranman New Member

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    May 24, 2012
    Thank you VOS, I had a feeling that needed to be terminated. The original tech didn't terminate it and I don't have a terminator on hand (yet). BTW, a lot of what yuou see in the pics can be attributed to me learning from your posts/participation in this forum. Lots of valuable info here. Thanks.

    Webby - Thanks for the comment / compliment. I had 771 issues with this configuration as you see it. The 771 issues seem to have gone away by powering down the SWM etc, and powering up the HR 34 first and then the furthest receiver, etc. This tells me it's a loss issue and also that my setup could benefit from reducing loss via an improved splitter setup (get away from the 2 X 8 ways).

    HoTat2 - The room is hardly ever used and only has one coax run and until recently I was unaware of the possibility of using a 2 way splitter right behind the receiver (giving 2 coax ins to the receiver). I just wanted to be factual regarding the current setup and what you se in the pics. Thanks
     
  6. west99999

    west99999 Icon

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    May 11, 2007
    With SWM you only need the one coax for both tuners there would be no need to put a splitter in line.
     
  7. veryoldschool

    veryoldschool Lifetime Achiever DBSTalk Club

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    Dec 9, 2006
    While there is no need to have larger splitters than you need, the lengths of coax you've posted shouldn't/aren't a problem.
    "I suspect" the unterminated port may have been the problem. All open ports on the SWiM outputs need to be terminated so they don't cause a reflection [bounced signal] that can degrade the signals to the other ports.

    If your system is setup correctly, you shouldn't need to worry about which receiver boots up first. Should you lose power, the system should come back up without needing to have any special booting routine.
     

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