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Quad Lnb

  • 08-04-2003 9:35am
    #1
    jasgrif11
    Registered Users, Registered Users 2 Posts: 439 ✭✭


    Hi Guys,

    I'm looking for the best and Cheapest Place to get a Quad Lnb? I think theres soemplace in the Uk doing them for £45 serling.

    Any help would be great

    Many thanks


Comments

  • #2
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    by time you pay exchange, VAT, postage and phone calls etc tony at www.satellite.ie might be cheaper.

    A regular dish and a Sky minidish use different models of LNB, mostly due to mounting.

    There are at least two sizes of minidish mount, but I found if the plastic insert in arm was removed the larger LNB peg fitted.

    On anything other than a common dish the F/d may be different. This is ratio of depth versus diameter of the actual parabaloid dish (center feed) or the virtual parabloid related to an offset feed dish (can't be measured).

    Any LNB has a sort of "cone of vision", if too wide (for small F/d dish) the LNB picks up noise. If too narrow, the LNB only sees part of the dish, less signal received (LNB for longer arm/ greater F/d)

    This is why very big or specialist dish use an LNB with flange and no horn. The dish then has a matched feed horn.

    The LNBs for sky often don't suit larger dish and vice versa as F/D may not be the same. If you prize off plastic cover on a Not Grundig one, you will see a plastic dome surrounded by concentric aluminium rings part of the inner case. These rings are an RF "lens" to limit field of view of the LNB. These LNBs are very limited on F/d range.

    The Sky Grundig LNB I have appears indentical except plastic case to a Grundig for regular 90cm dish.

    In test on a 1m dish an old 1dB LNB performed best as it was obviously better suited to dish diameter / focus distance ratio. The Sky LNB with focus rings worked best on minidish and worst on 1m Dish.


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