1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Is there dangerous voltage off DirecTV swm ports

Discussion in 'DIRECTV Connected Home' started by cypherx, Jun 20, 2014.

  1. cypherx

    cypherx Hall Of Fame

    3,470
    67
    Aug 27, 2010
    PA - Berks...
    Just curious if theres dangerous voltage (not to humans, but to elecronics) on a DirecTV swm port.

    For example, say you have a green labeled 8 way feeding 8 rooms, and a cable splitter feeding a few rooms. In a room with both feeds, if you accidently connect the coax jack from the DirecTV to a tuner, would it blow the tuner out?

    Or is just the first, red port the only port able to pass voltage. I know I could break out the multimeter and measure myself, but I don't have that out right now.
     
  2. litzdog911

    litzdog911 Well-Known Member

    12,233
    68
    Jun 23, 2004
    Mill Creek, WA
    No, you won't damage anything do this. Only the "power passing" port passes the SWM power supply (typically 21-29V). And even that voltage won't hurt anything.
     
  3. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

    42,684
    349
    Dec 9, 2006
    Basically the only way you can screw up is to connect the PI BACKWARDS!!!!!!!!!!!!!!!!!!
     
  4. armophob

    armophob Difficulty Concen........

    7,393
    65
    Nov 13, 2006
    Fort Pierce, FL
    But do be careful when connecting the coax. I have tapped the center connector on the outer shield once and blew a PI.
    No dangerous fire or anything. Just a quick spark and it was dead.
     
  5. peds48

    peds48 Genius.

    20,082
    1,068
    Jan 10, 2008
    NY
    If you connect a cable that is feeding power to the dish to a tuner you can damage the that tuner.
     
  6. P Smith

    P Smith Mr. FixAnything

    22,152
    192
    Jul 25, 2002
    W.Mdtrn Sea
    BS, all receiver's inputs have Zener diodes to prevent OV
     
  7. veryoldschool

    veryoldschool Lifetime Achiever Staff Member Super Moderator DBSTalk Club

    42,684
    349
    Dec 9, 2006
    No they don't!!!!!!
    During testing a HR20 was literally "smoked" by a PI connected backwards.
     
  8. P Smith

    P Smith Mr. FixAnything

    22,152
    192
    Jul 25, 2002
    W.Mdtrn Sea
    that's HR20 ... tell that its HW designers
     
  9. gov

    gov Legend

    1,101
    50
    Jan 11, 2013
    I zapped a balun on a TV antenna by connecting the antenna lead to a PI. (not that I make many mistakes)

    I suspect a PI output connected to quite a few items might cause a problem, modulators, RF amps, UHF/VHF combiner/splitters. I'm not going to finance research into this, the $1 balun was a severe enough hit for me.

    :coffee
     
  10. cypherx

    cypherx Hall Of Fame

    3,470
    67
    Aug 27, 2010
    PA - Berks...
    Good information, thanks guys!
     
  11. litzdog911

    litzdog911 Well-Known Member

    12,233
    68
    Jun 23, 2004
    Mill Creek, WA
    You're welcome!
     
  12. harsh

    harsh Beware the Attack Basset

    21,192
    183
    Jun 14, 2003
    Salem, OR
    The HR20's designers are not the ones making false claims about their product.
     

Share This Page