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Two recievers conflicting?

  • 08-09-2013 2:44am
    #1
    DonkeyStyle \o/
    Closed Accounts Posts: 7,145 ✭✭✭


    I've set up a dish for free-to-air (astra2) and have receivers in two rooms. The signal is perfect on either when it's the only one powered on. But when both boxes are turned on, the signal quality suffers. To the point where there's breakup on some channels (especially the HD ones). The LNB has 4 ports and both receivers have cable going all the way to the dish, to their own ports.

    This was done with the cheapest available gear, so I'm thinking maybe I'm getting what I paid for? Or is there something else I'm missing. :confused:


Comments

  • #2
    The Cush
    Registered Users, Registered Users 2 Posts: 15,852 ✭✭✭✭The Cush


    Did you install the dish and cabling yourself? If so, did you use a meter to align the dish?

    What is the dish size?
    What type of cabling did you use and approx. how long are the cable runs?

    Where are you located approx.?


  • #3
    snaps
    Registered Users, Registered Users 2 Posts: 7,138 ✭✭✭snaps


    Sounds to me like a faulty LNB. Try connecting cable to different outputs on the LNB. Perhaps a short circuit inside the LNB.


  • #4
    gtg60
    Registered Users, Registered Users 2 Posts: 1,759 ✭✭✭gtg60


    snaps wrote: »
    Sounds to me like a faulty LNB. Try connecting cable to different outputs on the LNB. Perhaps a short circuit inside the LNB.

    Most likely although if you used the 'cheapest of everything' it could possibly be interference between the cables.


  • #5
    DonkeyStyle \o/
    Closed Accounts Posts: 7,145 ✭✭✭DonkeyStyle \o/


    Well cheapest of everything might be an extreme way of putting it, but there's certainly nothing premium or expensive involved.
    The Cush wrote: »
    Did you install the dish and cabling yourself?
    Yep. :o
    The Cush wrote: »
    If so, did you use a meter to align the dish?
    Yeah, I got it to a point where I couldn't change the alignment by any smaller amount, without losing the beeping at the sensitivity I had.
    The Cush wrote: »
    What is the dish size?
    Uhm. I'm not exactly sure... I want to say around 1 meter wide, or slightly less. It's oval shaped. I google image searched "sky dish" and it looks like that. The LNB has a Sky logo on the back, what ever that means.
    The Cush wrote: »
    What type of cabling did you use
    The sticker on the reel says RG6 Coax, foam dielectric, al foil shielding.
    The Cush wrote: »
    and approx. how long are the cable runs?
    ~30ft and ~65ft? Either one sits at around 80-90% signal strength. And while turned on alone, can watch BBC HD without any breakup.
    The Cush wrote: »
    Where are you located approx.?
    Dublin City North.
    snaps wrote: »
    Sounds to me like a faulty LNB. Try connecting cable to different outputs on the LNB. Perhaps a short circuit inside the LNB.
    I'll give that a try, thanks.
    gtg60 wrote: »
    Most likely although if you used the 'cheapest of everything' it could possibly be interference between the cables.
    I did leave some slack on one of the cable runs, which sits in a loose loop around itself (it's a work in progress). The two cables run alongside each other for about 15 feet before going off in completely different directions.

    [Update]: I moved the two cables from ports [1] [2] on the LNB to ports [1] [4] and the problem, as far as I can tell, is gone.
    Although, I'm adding a third receiver soon... so I can't avoid using adjacent ports.

    How does this work though, do the longer cable runs get more juice run through them (like the box negotiates it?) or are they all the same? Like maybe I could try to isolate the long cable run on port [4] and have the two shorter runs use [1][2]?

    Is there some more heavy duty LNB I could get to mitigate this? Like the super-shielded ultra deluxe model? Or should none of them be behaving like this and I've got a dud?

    Thanks for the replies.


  • #6
    Peter Rhea
    Banned (with Prison Access) Posts: 4,285 ✭✭✭Peter Rhea


    The output level from the lnb is the same no matter what length cable is used.

    A zone 2 Sky dish (the type intended for Irish use) would be 70-something cm wide, btw.


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  • #7
    The Cush
    Registered Users, Registered Users 2 Posts: 15,852 ✭✭✭✭The Cush


    DonkeyStyle \o/ wrote: »
    Is there some more heavy duty LNB I could get to mitigate this? Like the super-shielded ultra deluxe model? Or should none of them be behaving like this and I've got a dud?

    As snaps posts above the LNB could be faulty, maybe on one port only?

    When you get the third receiver test it on port 3 or take it back if still under guarantee.

    Just a point note, when connecting or disconnecting cables from the LNB or receiver ensure that the receiver is fully powered down to avoid a short circuit that can damage the LNB or receiver. I'd also recheck the connections at the end of each cable to ensure none of the cable braid wires are touching the core wire.


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