Register

Welcome to the RDI-Board Community.

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed.


Donate Now Goal amount for this month: 100 EUR, Received: 100 EUR (100%)
Donate to support this site...

Results 1 to 5 of 5
  1. #1
    Junior Member Master
    RDI - Board Default Avatar

    Join Date
    Mar 2007
    Location
    Chakwal,Punjab, pakistan
    Posts
    52
    Posts Thanks / Likes

    Default TO Calculate correct Rod length of dish


    Calculate the lengths of rods and fix for optimum signal strength by the following formula given by fiazi bhai in his thread :
    Focal Length in inches =
    (D X D)
    ______ - 0.25
    (d X 16)
    D = Diameter of dish in inches
    d = Depth of dish in inches


    Please read again, it is very clearly " Focal Length in inches = " , it is not rod length, it is Focal Length as mentioned above. So what is not clear ?
    For rod length you have to measure physically, from the circumference-fixing-hole to the Feed-horn-fixing-hole, placed at the Focal Point on above calculated point.

  2. #2
    Moderator Expert
    Join Date
    Jan 2006
    Location
    Africa-Kenya-Nbi
    Posts
    3,108
    Posts Thanks / Likes

    Default



    something like this
    Dstv HD PVR

  3. #3
    Banned Member Expert
    Join Date
    Apr 2005
    Location
    Coast of Ionian Sea
    Posts
    1,040
    Posts Thanks / Likes

    Default

    Quote Originally Posted by satlover01 View Post
    Calculate the lengths of rods and fix for optimum signal strength by the following formula given by fiazi bhai in his thread :
    Focal Length in inches =
    (D X D)
    ______ - 0.25
    (d X 16)
    D = Diameter of dish in inches
    d = Depth of dish in inches


    Please read again, it is very clearly " Focal Length in inches = " , it is not rod length, it is Focal Length as mentioned above. So what is not clear ?
    For rod length you have to measure physically, from the circumference-fixing-hole to the Feed-horn-fixing-hole, placed at the Focal Point on above calculated point.

    this site clearly demonstrate how it is measured:
    http://www.samidish.com/SAMIINST1.pdf
    No GUTS!No GLORY!
    .

  4. #4
    Moderator Expert
    Join Date
    Jan 2006
    Location
    Africa-Kenya-Nbi
    Posts
    3,108
    Posts Thanks / Likes

    Default

    So what is not clear ?
    For rod length you have to measure physically, from the circumference-fixing-hole to the Feed-horn-fixing-hole, placed at the Focal Point on above calculated point.
    its still easier to work on the rods lengths mathematically, using the formula of triangles side lengths
    but since the focal point is the most critical you can also measure the rod lengths physically
    Dstv HD PVR

  5. #5
    canine consultant Expert
    Join Date
    Feb 2004
    Location
    over the Hill, and down the road
    Posts
    1,318
    Posts Thanks / Likes

    Default


    You will find that the focal lenght has a bit of latitude on a C-band set up, due to the fact that the LNB passes through the Scaler ring.

    The focal length is then measured from the centre of the dish to the "blue" cap on the LNB, not the scalar ring.
    regards from OZ bassett

 

 

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Back to Top