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spliter & amps

  • 29-12-2009 1:46am
    #1
    lpm
    Registered Users, Registered Users 2 Posts: 49 ✭


    Have done a little bit of reading and have a few questions. IF i put a splitter on the feed in the house does this decrease the signal by 3.5db, and if I put a two way splitter on does that mean I upto 7.db in loss and so on for a 3/4 way splitter .In that case if I introduce a distribution amplifier before the splitter, would I only need one that does 7.db for a two way split?. Also can any one tell me what range of freq ntl analogue channels are broadcast on . I was thinking of buying this one, any good, or could someone recommend a better one.
    http://www.antiference.tv/input-level-control-distribution-amplifiers-internal

    Thanks


Comments

  • #2
    Dardania
    Registered Users, Registered Users 2 Posts: 3,612 ✭✭✭Dardania


    Hi,

    You pretty much have jist of what's going on - as you split a signal, you degrade the signal, as the same feed now has to provide signal to additional devices.

    Regarding amplifiers, in UPC situations it's typically best to stay away from using them as they usually prevent the possibility of using an internet/voip modem, as they block the return path. Your best bet is to get high quality splitters, and enusre you have good coax with well terminated connections.

    The crowd that manufactures UPC's splitters have an online shop:
    http://www.in-home-network.co.uk/splitters--isolators-16-c.asp

    And if you click onto the images of each splitter, theres a dB rating for the attenuation of each splitted output. In my parent's house I have one of the 4 way splitters: http://www.in-home-network.co.uk/ecoline-splitter-esi-04n-58-p.asp and it works - digital stb is fine, modem is fine (just within the operational ranges for input/output power) and analogue TV is fine on a good TV.

    Is there a particular reason why you would need an amp?


  • #3
    BostonB
    Closed Accounts Posts: 18,056 ✭✭✭✭BostonB


    NTL split mine when they installed it. Theres something in the box on the wall though as I can't move my internet/modem to any other NTL socket in the house.

    If your splitting the analog it would degrad the signal, maybe not by much in my experience, but if its a digital signal would it matter? Though you'd need a UPC STB to use it.

    I see it split often into the UPC box and then into a DVD or HD PVR. The pass through on the UPC box going direct into the TV.

    My analog is dire though. I doubt UPC would fix it either.


  • #4
    lpm
    Registered Users, Registered Users 2 Posts: 49 ✭lpm


    Cheers lads. Dardania I am thinking that I would need an amp due to the length of cable run's. Ntl ran one from the pod in the eves around to the first point which would be approx 15mtrs. I am going to stick a good quality splitter on that and run another cable another 15mtrs. Will be using a good quality WF-100 or similar cable to minimize signal lose. With regards to amps I see your point regarding return paths for cable BB etc but is there not amps out there like sky ones that allow this. Dont have BB on the line at the moment and if I do get it in, worse case I could take the amp off.
    Appreciate the links, Thanks


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