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Electrical Tilt Formula

Viewing 15 posts - 1 through 15 (of 29 total)
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  • #53193 Reply
    Mohit
    Guest

    Hi All…

    One of my friend has recently gone through an interview…and the interviewer asked him two questions…

    1) wat is the formula for calulating/ deciding electrical tilt for a site.

    2) how many TCH are required during a Confrence call..

    Pls do reply if somebody have any idea regarding these above question…

    Regards..
    Mohit..

    #53194 Reply
    pix
    Guest

    1> geometrical calcula : depending on height of antenna, expected cell range and vertical aperture of the antenna, one can compute the required tilt in order to locate the upper “-3dB” point onto the cell range.
    f(H, CR and VHPBW) –> tilt
    the formula uses “tan” function… i let you find it by yourself 🙂

    2> only one TCH per user.

    #53195 Reply
    Mohit
    Guest

    Thanks Pix…

    But can u explain this formula a little more…i mean with an example…

    Regards..
    Mohit

    #53196 Reply
    pix
    Guest

    Mohit,

    i hope you didn’t kill yourself trying to find the formula, huh.

    cell range = Height BTS / (tangent(tilt – VHPBW/2))

    example : height = 30m
    VHPBW = 8 degrees
    tilt = 6 degrees

    –> cell range = 30/tan(radians(6 – 8/2)) = 859 meters.

    #53197 Reply
    Mohit
    Guest

    Many Many thanks Pix…
    🙂

    #53198 Reply
    MKT
    Guest

    Pix..

    How will you find the 3 dB point from BTS?

    Does the formula takes into account the BTS Tx Pwr Max?

    Regards

    MKT

    #53199 Reply
    pix
    Guest

    the 3dB upper point is taken into account in the formula (–> VHPBW/2)

    the BTS power does not matter in this formula. What matters is how far you want to locate your “3dB upper point” (=cell range). The BTS power will then give you the “intensity” of the coverage within this cell range.

    regards
    pix

    #53200 Reply
    MKT
    Guest

    Pix

    what is VHPBW?

    Regards

    #53201 Reply
    pix
    Guest

    vertical half power beam width… it is the vertical “aperture” of the antenna. You can see it on the antenna specifications. Usually around 8 degrees.

    #53202 Reply
    Nitin Tomar
    Guest

    What is the significant of Vertical beamwidth in coverage???

    #53203 Reply
    Pix
    Guest

    Nitin, isn’t it explained just one post below ?

    #53204 Reply
    baig
    Guest

    Is the tilt in the formula got from sum of electrical and mechanical tilt or its just the electrical tilt? how does mechanical tilt affect the formula

    #53205 Reply
    Pix
    Guest

    In the formula, you should use the sum of electrical tilt + mechanical tilt.

    #53206 Reply
    Ahsan
    Guest

    I really acknowledge ur effort regarding helping other optimizers and learners..

    Well it means that we have to take effective tilts into account.

    Also i wanted to know the individual effect of mechanical and electrical tilt.

    Well as i have experienced.. mechanical tilts adds backlobes.. question is Y.?

    #53207 Reply
    Pix
    Guest

    Hello,

    Mechanical tilt : increase downtilt in front, but since you’re tilting the whole antenna, you see that the backlobe will get uptilted, yes? ,

    Electrical tilt: all directions around the antenna are tilted down, like when you’re closing an umbrella : all sides are getting down at the same time.

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