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Electrical Tilt Formula

Viewing 14 posts - 16 through 29 (of 29 total)
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  • Author
    Posts
  • 28th March 2009 at 11:28 #53208
    Nitin Tomar
    Guest

    is there any formula to calculate the coordinates from the site upto 400m or greater having more traffic,ie,formula to plan infill sites…………………………………

    28th March 2009 at 13:41 #53209
    Pix
    Guest

    nitin, sorry, i don’t understand your question.

    29th March 2009 at 05:06 #53210
    nitin tomar
    Guest

    pix,

    my question is………….

    can there is any formula to calculate capacity site…..as currently we have to plan one by one looking traffic and utilization of nearby sites…….

    29th March 2009 at 05:55 #53211
    Pix
    Guest

    There are planning tool, such as planet or 9155 RNP, but the don’t work automatically. You still need to do something, but they help you making the right decision.

    30th March 2009 at 04:52 #53212
    Karim
    Guest

    how can this formula apply on my data

    Height: 44
    VHPBW: 6.8 degrees
    tilt: 4 degrees

    with many regards,

    30th March 2009 at 07:40 #53213
    Ahsan Murtaza
    Guest

    44/(tangent (4- 6.8/2))

    1400m approx

    29th July 2009 at 16:52 #53214
    Tilter
    Guest

    Just want to ask basis for VHPBW, because in kathrein 742352(1710-2180) panel antenna it goes like this:

    HALF-POWER BEAM WIDTH COpolar

    1710-1880MHZ, horizontal=88 degress,Vertical=7.4 degrees

    1850-1990MHZ, Horizontal=90 degrees,
    vertical= 7degrees

    1920-2180MHZ, horizontal=88degrees,
    vertical= 6.5degrees

    which one should I use?does tilting decrease coverage distance in reality?or just decreasing the intensity of signal?
    thanks

    29th July 2009 at 17:09 #53215
    tilter
    Guest

    hi,

    how did you arrive with 1400m?

    range=44/(tangent (4- 6.8/2))

    Range=1400m approx?

    I have use the formula and it yields 4201 mtrs or 4.2kms, pls correct me if Im using the formula wrong, thanks

    29th July 2009 at 18:00 #53216
    Abdel
    Guest

    Tilter ur right your formula is correct i confirmed by using the Kathrein distance calculator and it comes up with
    upper beam 4201.5369 m
    main beam 629.2293 m
    lower beam 338.7812 m,

    30th July 2009 at 16:46 #53217
    tilter
    Guest

    Hi Abdel,

    Thanks for confirming it, do you have another formula considering the terrain? because We are optimizing an area that involves uneven terrain, and I think our formula is not that applicable since its basis is a plane land.

    Regards

    31st July 2009 at 10:04 #53218
    Abdel
    Guest

    For this i think you have to use a cell planning tool, in our network we use Asset3G from Aircom, the software uses the digital map terrain information to calculate the distance. In a manual way i don’t know the formulae behind it. These days everything has being turned into software so u don’t need much to do it manually,

    4th August 2009 at 11:19 #53219
    tilter
    Guest

    Hi Abdel,

    Thanks for the information.

    regards

    30th August 2009 at 13:19 #53220
    RNP2
    Guest

    what is the relation between half power beam width and the tilt?

    1)If we give more electrical down tilt what should be the change in half power beam width?

    2)1)If we give more Mechanical down tilt what should be the change in half power beam width? beam width will increase???

    31st August 2009 at 08:35 #53221
    tilter
    Guest

    Hi RNP2,

    There should be no changes for the angle values in the beamwidth because it is constant, it will just vary due to terrain and other reflecting factors, altho the tilt will decide on how much the vertical beamwidth will reach a certain distance, the changes will take place in the Horizntal beamwidth, It has no discreete calculation because it will depend on the terrain also and the distance that the lobes may reach, but it can be seen using prediction tools and RF tools but not in the formulas.

    Regards

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