 This topic has 28 replies, 1 voice, and was last updated 11 years, 3 months ago by tilter.

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Nitin TomarGuest
is there any formula to calculate the coordinates from the site upto 400m or greater having more traffic,ie,formula to plan infill sites…………………………………
PixGuestnitin, sorry, i don’t understand your question.
nitin tomarGuestpix,
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…….
PixGuestThere 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.
KarimGuesthow can this formula apply on my data
Height: 44
VHPBW: 6.8 degrees
tilt: 4 degreeswith many regards,
Ahsan MurtazaGuest44/(tangent (4 6.8/2))
1400m approx
TilterGuestJust want to ask basis for VHPBW, because in kathrein 742352(17102180) panel antenna it goes like this:
HALFPOWER BEAM WIDTH COpolar
17101880MHZ, horizontal=88 degress,Vertical=7.4 degrees
18501990MHZ, Horizontal=90 degrees,
vertical= 7degrees19202180MHZ, horizontal=88degrees,
vertical= 6.5degreeswhich one should I use?does tilting decrease coverage distance in reality?or just decreasing the intensity of signal?
thankstilterGuesthi,
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
AbdelGuestTilter 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,tilterGuestHi 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
AbdelGuestFor 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,
tilterGuestHi Abdel,
Thanks for the information.
regards
RNP2Guestwhat 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???
tilterGuestHi 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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