PDA

View Full Version : XR2 + 17db Hyperlink Panel


tamahome
02-19-2009, 12:38 PM
Hi, Im having this doubt. Im using 2 panels hyperlink 17db with 20º tilt down at the moment with 0º tilt down.

The model has 6.5% of vertical beam width, so if its about 38mts high it should be listening from 670mts to the horizon. If I set the panel 10º down leaving it at 70º from the horizon the signal will start at 161mts and finish at 321mts.

So panels wont work for close + far links. Am I mistaken? Now I have a 8db omni antenna for short links and the panels for far. But Im because of Noise Floor issues only 3 channels work 5, 6 and 11, so 1 panel is at 11 and the other 2 antennas are too close and sometimes they make connection problems. My plan was to take out the omni and get the left panel (only got 2 120º) and change the clients from AP.
But now Im facing this issue, panels wont hear close links.

Is everything I said ok or am I not understanding how panels work?

Thank you.

WHT
02-19-2009, 01:24 PM
Antenna height = 115 feet
Antenna beamwidth = 6.5º

Antenna downtilt = -10º
Inner line = .08 miles
Outer line = .18 miles

Antenna downtilt = -20º
Inner line = .05 miles
Outer line = .17 miles

Antenna downtilt = -3º
Inner line = .2 miles
Outer line = Horizon

Antenna downtilt = -4º
Inner line = .8 miles
Outer line = 1.7 miles

http://telecomanddata.com/WiFi_antenna_downtilt.pdf
Create an XLS spreadsheet and use the formulas listed at the bottom.

tamahome
02-19-2009, 01:40 PM
so theres no way to make close and far links, I should use another antenna for close =(

Are the panels completly blind at 100mts for instance if the down tilt is zero or should work anyway?

WHT
02-19-2009, 02:55 PM
One slight advantage to a sectored, panel, or patch antenna is you can downtilt them such that they do NOT see a lot of traffic out on the horizon. Typical downtilts are less than 5º, if even that much.

Close in clients would be no different from an omni antenna that shoots over them...but the fact they are close in means they're getting a pretty good signal to begin with. I'd even uptilt the client a tad.

But no..its not like there is a black and white line where they will get no signal at all if they are too close.

tamahome
02-19-2009, 04:35 PM
its good to know, thank you.

CzechEnglishFrenchGermanItalianPolishPortugueseRussianSpanish
Translations delivered by vBET 3.5.4