Technically speaking you're wrong. The highest gain area of a sector antenna is the center point between the horizontal and vertical spreads. If you don't downtilt you are sending the strongest part of the signal parallel to the horizon. Why would you ever want to do that? The whole reason you downtilt is to get the strongest signal pointed to the area you want.
Figuring this out takes some basic trig calcs using the tangent function. No one has asked the most important questions you need to know when calculating downtilt: 1. How high up is the sector antenna? 2. How far out or in what range near to far do you want the sweet spot? 3. How close in to the tower do you need service? #2 and #3 can conflict with each other and you may have to make a tradeoff. leb At 2:22 PM -0400 3/29/10, Faisal Imtiaz wrote: >..... Technically speaking.. if you are not concerned about dealing with >'near' customers.... less than 1 or 2 miles... then you can pretty much >leave the sectors at '0' tilt.. and you have coverage to the horizon.... > >The built-in electrical down-tilt typically throws folks off...... only >becomes a factor if you are needing to down tilt for near customers.. > >Faisal. > >On 3/29/2010 1:36 PM, Robert West wrote: >> I'm having a heck of a time with the large UBNT sectors getting the tilt >> angle to jive. With the smaller sectors, they behave perfectly and go right >> where the calculations say they will however, with the larger ones, nothing >> I do other than have someone 10 miles out with a CPE check levels while I >> tilt up and down seems to be good. I REALLY don't want to have to do that >> with all of them... >> >> >> >> Anyone having any success or insight with the proper tilt of these things? >> Using the 120 degree 5GHz flavors. >> >> >> >> Thanks! >> >> >> >> Robert West >> >> Just Micro Digital Services Inc. >> >> 740-335-7020 >> >> >> >> Logo5 >> >> >> >> >> >> >> >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> -------------------------------------------------------------------------------- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ > > >-------------------------------------------------------------------------------- >WISPA Wants You! Join today! >http://signup.wispa.org/ >-------------------------------------------------------------------------------- > >WISPA Wireless List: wireless@wispa.org > >Subscribe/Unsubscribe: >http://lists.wispa.org/mailman/listinfo/wireless > >Archives: http://lists.wispa.org/pipermail/wireless/ -- l...@iridescent.org -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
