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AT9 installation question.

Discussion in 'DIRECTV General Discussion' started by wedge40, Sep 1, 2006.

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  1. wedge40

    wedge40 Mentor

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    Aug 6, 2006
    Ok I'm in the process of installing the AT9 I bought.. I know I can have D* come out and install for free, but I'm going to attempt myself first.
    This may seem like a stupid question, but the install video on SS says to put all four cables on the LNB before alignment and never touch them again. I was thinking of making four short cables that would just stick out the back a foot or two and then use barrel connectors to hook the runs that will lead into the house.. Is this going to be a problem?
    What is the loss of barrel connecter?


    Greg
     
  2. litzdog911

    litzdog911 Well-Known Member

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    Jun 23, 2004
    Mill Creek, WA
    High quality barrel connectors should not cause any signal loss. Just be sure they're well sealed to prevent moisture problems down the road.
     
  3. captain_video

    captain_video Icon

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    Nov 21, 2005
    Typically, you'll see about a 1/2-dB drop with every coaxial connection you add to the signal path. I would recommend using longer cables and connect them to a grounding block. That way you can connect the cables leading into the house on the other side of the block and have a grounding point for your dish and cables at the same time. The grounding block is basically just a couple of barrel connectors on a mounting bracket.

    Get yourself some compression connectors and a compression tool along with a coax cable stripper. You'll be glad you did. Use Coax Seal on all exposed connectors to keep out moisture and prevent corrosion.
     
  4. Claus

    Claus AllStar

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    Nov 20, 2005
    The reason for cables to be installed and not touched is because they don’t want LNBs disturbed after dish is align. Good quality F barrel connector is minimal loss, not to worry if only 1 in line. Grounding block is best idea and set you up for future.
    Claus
     
  5. boba

    boba Hall Of Fame

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    May 23, 2003
    Use barrel connectors with blue plastic centers not "WHITE".
     
  6. Cap'n Preshoot

    Cap'n Preshoot Godfather

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    Jul 16, 2006
    For properly installed connectors (correct connector, correctly prepared cable end & correct crimp ....compression preferred....) the loss will be closer to 0.1 db (1/10th). Ordinarily an insignificant amount, but again assuming good craftsmanship and the right tools.

    If you ever have the opportunity to see a 1 Ghz "sweep" of a length of coaxial cable using a time-domain reflectometer (TDR), depending upon the sensitivity of the instrument you may be able to see the effect of a splice if you look close. However, even more enlightening is to see the long-term effect of a very tight bend (i.e., a knot tied in the cable), see the immediate effect (almost negligible) but then look again after an hour or two of it sitting in a blazing hot attic. Equally impressive is to see the effect (again after an hour or so) of the effect of the cable being stapled to a 2x4 stud with an Arrow T-25 staple gun (or any fastening method) that impinges upon the integrity of the circumference of the cable. The TDR will make believers out of the many doubting Thomas' in this group.
     
  7. wedge40

    wedge40 Mentor

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    Aug 6, 2006
    Blue. What's the difference in specifications between blue and white?

    As far as getting the antenna hooked up.. I dont even have an H20 yet or an HDTV.. So I guess by the time I get around to getting those I'll have to go back up on the roof and tweek things a little.

    Greg
     
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