Same here - though our ground is very flat. Put it up at -1 degree, find a far (9mile), mid (5 mile), and near (1 mile) customer and adjust downtilt until the mid customer peaks and verify that the near and far customers are still acceptable. For us what works for the mid customer is also best for the far. Generally ends up around -1 but varies with tower height and antenna manufacturer.
While F/B ratio is very important in 5.7 for frequency reuse it’s critical in 3.65. Cambiums antenna’s they spec from the 3.65 product are really pretty decent for F/B ratio. If you can find something better that’s great, but don’t go down in F/B ratio if you want to operate in A/B/A/B unless you have some other method of ensuring that the close in CPE are only going to ‘see’ the front side of the desired sector or there will be issues with poor modulation on the near customers. Mark > On Mar 16, 2018, at 1:06 AM, Sean Heskett <[email protected]> wrote: > > Most likely zero...but here’s how we do it. > > Hang the AP and aim it where you think it should be aimed and leave the > doentilt at zero (unless you have a huge height difference like a 1000’ feet > or more) then Install 2-4 SMs, or have your installers hang out with an SM > connected to the AP scattered around where you think you want coverage, then > move the AP to get the best signal at those SMs. > > You can use all the calculators you want but this method works every time. > We have to do this because typically our tower is on top of a mountain and > there is a 3000’+ height difference between AP and SM. > > -2cents > > -sean > > > On Wed, Mar 14, 2018 at 5:45 PM Jay Weekley <[email protected] > <mailto:[email protected]>> wrote: > We're putting up a KP Performance KPPA-900DP-90S for use with the 900 > MHz 450i APs. How much down tilt would you use to serve customers up to > 7 miles away? It has zero electrical down tilt > _______________________________________________ > Members mailing list > [email protected] <mailto:[email protected]> > http://lists.wispa.org/mailman/listinfo/members > <http://lists.wispa.org/mailman/listinfo/members> > _______________________________________________ > Members mailing list > [email protected] > http://lists.wispa.org/mailman/listinfo/members
