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Advice on Gemini Dish Installation

  • 14-04-2003 4:16am
    #1
    TVDX
    Closed Accounts Posts: 510 ✭✭✭


    I was reading What Satellite TV magazine recently and i saw the Gemini dish advertised, which has about 5 lnb holders specially positioned to recieve Astra 1, Astra 2 and Hotbird all from the same dish.

    What i am wondering is, how would you install this?.
    I know that at least one of the lnb's will be facing in the same direction as my current dish, i.e. at 28 degrees, so if i put all the lnbs into the holders, and just elevate it in a way that the lnb farthest to the left is pointing at 28 degrees will the other lnbs fall into place and get 19.2 degrees and 13 degrees?.
    I know that this is what the dish is designed to do,
    but im wondering if anyone had any experience with doing it with this or any similiar dish?.


Comments

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


    No. The LNB holder on arm is probabily pointing at 19.2. 28.E will probabily be left most. Depends on design, dish size and which satellite

    Also you probabily need a 90cm dish.


  • #3
    TVDX
    Closed Accounts Posts: 510 ✭✭✭TVDX


    Actually yes that makes sense,
    the focal point of the dish would of course be 19.2 degrees and then the others will fall into place, the dish im talking about is 90cm so it should be ok.


  • #4
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    look at my 2 year old site:
    http://homepage.eircom.net/~watty/satellite/sathowto-p6.htm

    lnbs2.jpg

    (I have 2 dishes with multiple LNBs and mechanically better brackets :D now too. Must post fresh site soon with new pics)


  • #5
    seano
    Closed Accounts Posts: 371 ✭✭seano


    http://www.xs4all.nl/~s0ud/sat.htm


    Look at the pictures on the bottom,language is dutch

    Astra 1/2, sirus an hotbird on a 100cm dish .Positon.Holland

    (Translation given ---10cent per word;) ;)


  • #6
    TVDX
    Closed Accounts Posts: 510 ✭✭✭TVDX


    Watty,
    is the picture of the dish that you posted on the ground or is it up on a wall?.

    Is it possible to put the dish on the ground, if its going to be in a place that nobody will walk by it or disturb it?, and then just secure it with bolts.

    Thats one of the things that i would be worried about in terms of installing it myself, having to go up and down a ladder, and it not being convenient to move around and adjust dish as neccesary.


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  • #7
    TVDX
    Closed Accounts Posts: 510 ✭✭✭TVDX


    BTW, am i right in thinking that my Sky digital box with the LNB at 28 degrees will now have much reduced signal quality if i go ahead with this?.


  • #8
    chernobyl
    Closed Accounts Posts: 2,682 ✭✭✭chernobyl


    Originally posted by TVDX
    BTW, am i right in thinking that my Sky digital box with the LNB at 28 degrees will now have much reduced signal quality if i go ahead with this?.

    Nah. 13/19/28 provide oodles of signal for us and most of your dish will go to wasted when only picking up one bird.

    A sky digital dish is actually more advanced and engineered than pretty much any other dish on the market. Its light/small and yet makes the most of what it sees, is cheap and durable.

    From your perspective of adding multiple LNB's to it, it should not prove difficult as the beamwidth (how far left and right the dish can see) is quite wide and this is true for practically all tiny dishs and this means they are easy to align and suitable for modification. the trade off is that with a wide beam width you also gather lots of noise but as we are in the sweet spot in ireland for pretty much anything you want, noise wont prove a problem.


  • #9
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    A very offset LNB on a 90cm dish gets more signal than centre LNB on a mini-dish as the 90cm dish has 4 to 6 times gain.


    My dishes are along edge of a very flat shed roof, accessible with step ladder.

    Due to high hedge/wall, the lowest a dish works in my house is 4ft off ground on a back wall.

    The view of dish is at more upward angle than it appears (about 24 degrees).

    On a north wall (or north west wall) very often the dish wich faces south east only needs to be shoulder height. Often you could drill the holes standing on ground.

    A 200ft cable run is no problem as the signal is amplified in LNB.

    My cables (many including phone, PC network coax, PC cat 5 LAN, TV and several satellite) are in a pipe I laid under the lawn from shed / workshop at back of garden. They come up in Kitchen and some go to living room. I used cheap white waste pipe like on kitchen sink or washing machine outlet. Special PVC glue is used to make the "knees" waterproof.

    I left a steel cored washing line in to pull more wires in and pull in a washing line with new cable.


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