- This topic has 28 replies, 1 voice, and was last updated 11 years, 2 months ago by tilter.
28th March 2009 at 11:28 #53208Nitin 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…………………………………28th March 2009 at 13:41 #53209PixGuest
nitin, sorry, i don’t understand your question.29th March 2009 at 05:06 #53210nitin tomarGuest
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 #53211PixGuest
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 #53212KarimGuest
how can this formula apply on my data
VHPBW: 6.8 degrees
tilt: 4 degrees
with many regards,30th March 2009 at 07:40 #53213Ahsan MurtazaGuest
44/(tangent (4- 6.8/2))
1400m approx29th July 2009 at 16:52 #53214TilterGuest
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,
which one should I use?does tilting decrease coverage distance in reality?or just decreasing the intensity of signal?
thanks29th July 2009 at 17:09 #53215tilterGuest
how did you arrive with 1400m?
range=44/(tangent (4- 6.8/2))
I have use the formula and it yields 4201 mtrs or 4.2kms, pls correct me if Im using the formula wrong, thanks29th July 2009 at 18:00 #53216AbdelGuest
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 #53217tilterGuest
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.
Regards31st July 2009 at 10:04 #53218AbdelGuest
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 #53219tilterGuest
Thanks for the information.
regards30th August 2009 at 13:19 #53220RNP2Guest
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 #53221tilterGuest
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.