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DTV cabling question

Discussion in 'DIRECTV Installation/MDU Discussion' started by kadiir, Mar 22, 2013.

  1. kadiir

    kadiir New Member

    7
    0
    Jun 26, 2007
    Hi:

    When my DTV service was originally installed, the installer ran the coax through the exterior walls to where I wanted it and when I upgraded to HD they just used the same coax.

    I've finally done some centralized wiring and have a couple of questions as to how it should be wired. I think I've got it but am looking for confirmation.

    You can see how it is currently wired post-HD install in DTV Original.jpg. When I get home I'll double check but IIRC the dish has a SWM 3 LNB according to the DVRs.

    As part of the centralized cable plant, we took the living room run and moved it to the panel & then connected it to the living room wall jack keeping all other connections the same (wall to SWM power, etc.). This is working on both DVRs.

    For the first phase (see DTV Phase 1.jpg), I'm thinking of disconnecting the external coax for the Bedroom and using the new RG6 I've run (HR24 to wall to panel to living room wall to splitter) so that I can remove that coax & fill in the hole and then at my leisure to phase 2.

    I understand that going through 2 splitters will degrade the bedroom's signal but I'm assuming it would only be down to the level of the living room's HR24 as it's been going through 2 splitters from Day One and works fine.

    For Phase 2 (DTV Phase 2.jpg), I want to go to one splitter. I would the splittler, SWM power, and DECA to the panel and then split off the HR24 connections from there. This would require either a coupler (barrel connector) to the existing short coax going from the dish to the the outside splitter or having DTV come out and terminate the home run to the dish.

    For Phase 1 & 2 pics, the splittler "port numbers" for the DVRs & DECA are arbitrary.

    Have I got this right? If not, what needs to be fixed?

    Thanks!
     

    Attached Files:

  2. cabletech

    cabletech Legend

    264
    2
    Jan 20, 2011
    With only to H24's remove all the 8 way splitters and just use the 4 way (phase 2).

    Run all cables to the one single location and do your connections there.

    Barrel connecters to extend cables are not a problem, but be sure you are using the green label DTV splitters.

    Much cleaner install
     
  3. kadiir

    kadiir New Member

    7
    0
    Jun 26, 2007
    What 4 way? Or do you mean get one and replace the 8-way in "Phase 2" with it?
     
  4. peds48

    peds48 DIRECTV A-Team DBSTalk Club

    18,342
    901
    Jan 10, 2008
    NY
    Right, with only two receivers there is no need for the signal loss of an 8 way. even tho there is no difference if the receivers sees 41dbms or 50dbms. but in a rainy days it might make a difference
     
  5. veryoldschool

    veryoldschool Lifetime Achiever DBSTalk Club

    42,645
    338
    Dec 9, 2006
    Looks like someone hasn't made the change from dBµV to dBm too well.

    50 dBm = 100 watts
    -50 dBm = 10 picowatts
     
  6. peds48

    peds48 DIRECTV A-Team DBSTalk Club

    18,342
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    Jan 10, 2008
    NY
    two things

    first don't know how to type the special character, second, which is tied to the first, it was (is) an example to make a point which in this case being EXACTLY precise is irrelevant. I could have said "the receivers don't care if the see 50 or 100"
     
  7. veryoldschool

    veryoldschool Lifetime Achiever DBSTalk Club

    42,645
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    Dec 9, 2006
    I wasn't trying to pick on you, but at the same time, couldn't let the lack of a minus sign go by.
    Doesn't every keyboard have a "- key" ?
     
  8. peds48

    peds48 DIRECTV A-Team DBSTalk Club

    18,342
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    Jan 10, 2008
    NY
    I was referring to the "u" in dbuv. again. In this case the minus sign is irrelevant.
     
  9. veryoldschool

    veryoldschool Lifetime Achiever DBSTalk Club

    42,645
    338
    Dec 9, 2006
    dBmV and dBµV relate to the voltage across a 75 ohm load and will always be positive.

    dBm relates to 1 milliwatt, so can be both positive and negative, but in the case of DirecTV, will be negative.

    1 milliwatt = 49 dBmV = 109 dBµV = 0 dBm

    39 dBmV = 99 dBµV = -10 dBm
     
  10. JACKIEGAGA

    JACKIEGAGA N.Y. FOOTBALL GIANTS

    5,617
    91
    Dec 11, 2006
    Long Island, NY
    Can you just use a cooper wire for a ground or it has to be green coated?

    I want to move my SWM but the green coated ground is not long enough.
     
  11. Rickt1962

    Rickt1962 Legend

    316
    5
    Jul 17, 2012
    No it doesnt need to be green. But it should be the same gauge or larger
     
  12. peds48

    peds48 DIRECTV A-Team DBSTalk Club

    18,342
    901
    Jan 10, 2008
    NY
    Green is the standard for ground, but of course any copper wire of the same gauge or better will do the trick. Also note that the NEC states that the ground cannot be longer then 20 ft. Your local jurisdiction may have different codes and if so those apply
     

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