Ryan, You need to figure a couple things before you deploy the sectors:
1. Where is your customer base that you are providing located? (1 mile? 10 miles? Out to 10 miles?) Example: With your location height and antenna choices a down tilt of 3* would give you a coverage area starting at .25 miles (-3db) from the tower extending to "infinity" (-3db) into the horizon whereas 7* down tilt will give you coverage from .17 miles out to 4.77 miles. The main lobe of the sector would cover everything in-between. (see http://www.terabeam.com/support/calculations/downtilt-cover.php#calc to get your own data)(or Google "down tilt calculators") 2. Where are your other towers located in relation to these sectors? I generally down tilt the sectors down enough to not interfere with my other towers. I have 7* down tilt and more on some of my towers due to this factor, but generally use about 3* on the majority of my sectors - - - depending on height. I think if you hit the down tilt calculators and study a few minutes you will get a good idea of how much and what direction. One fast word of advice - - be sure that you have the sector mounted EXACTLY with no down tilt. (use a torpedo level to check the "attitude" of your sector to insure 0* before using the markings on the sector) GL, MAC > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Ryan Langseth > Sent: Monday, October 22, 2007 10:52 AM > To: WISPA General List > Subject: [WISPA] Downtilt Calculation > > I have been meaning to ask this for a while. How does everyone figure > their downtilt? Do you tilt down slightly more or less than 1/2 the > vertical beamwidth? No downtilt? Anything else? > > As a real world example: > We are re-deploying a tower and are moving from an omni to sectors, we > are putting up tranzeo 13 db 120 degree sectors, with 13 degrees > vertical beamwidth. The height of our equipment is about 220 ft, over > pretty flat terrain. With such a setup, what would you do for the > downtilt? > > > > Thanks, > > Ryan > > ----------------------------------------------------------------------- > --------- > > ** Join us at the WISPA Reception at 6:30 PM on October the 16th 2007 > at ISPCON ** > ** ISPCON Fall 2007 - October 16-18 - San Jose, CA www.ispcon.com ** > ** THE INTERNET INDUSTRY EVENT ** > ** FREE Exhibits and Events Pass available until August 31 ** > ** Use Customer Code WSEMF7 when you register online at > http://www.ispcon.com/register.php ** > > ----------------------------------------------------------------------- > --------- > 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/ -------------------------------------------------------------------------------- ** Join us at the WISPA Reception at 6:30 PM on October the 16th 2007 at ISPCON ** ** ISPCON Fall 2007 - October 16-18 - San Jose, CA www.ispcon.com ** ** THE INTERNET INDUSTRY EVENT ** ** FREE Exhibits and Events Pass available until August 31 ** ** Use Customer Code WSEMF7 when you register online at http://www.ispcon.com/register.php ** -------------------------------------------------------------------------------- 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/
