Hi, we’re doing some testing with some 900 int ap’s that we purchased about a year ago and just had one question. The downward tilt calc spreadsheet that motorola provides say that we should have our radios right around 0 degree downward tilt (0.2 - 0.65). Now, is this 0 degrees on the mounting bracket or is it a true plumbed 0 degrees? Right now the radios look like they’re tilted about 10 degrees downward, and we’re seeing a test SM out 1.17 miles that keeps dropping or re-reging with hardware scheduling.
Readings form the SM are:
RSSI (Avg/Last): 1285/1284 Jitter (Avg/Last): 5/6 Power Level (Avg/Last): -79/-79
We’re in a pretty crowded 900 area up here, but just hoping that we’re maybe missing something on the tilt side of it?
Thanks,
Chris
R&D Specialist
702 Communications
cebens
How high is your AP?
What is the noise floor when you do a Spectrum Analysis?
Is 2x mode on or off on the SM, if on try off.
if the AP is at 100 feet with a 10 degree downtilt, the Outer -3dB Radius is over the horizon even though the sweet spot is .11 miles.
Thanks for the quick response. Our AP is mounted (actually three of them in half of a sector (sw, s, se) about 100 feet off the ground on top of a building.
Today I found a little cleaner frequency but even that still shows a noise floor of around a -75 most of the time at the AP.
2x mode is currently on, but we will try turning that off and see if we have any different results.
With such a crowded frequency up here, it’s hard to find enough open ones to run even these three radios. Right now we’re running 920, 906, 915 from SW to SE. This test SM is on the SE side.
I guess my question still is, should these be at a true plumbed 0 degrees?
cebens wrote: Thanks for the quick response. Our AP is mounted (actually three of them in half of a sector (sw, s, se) about 100 feet off the ground on top of a building.
Today I found a little cleaner frequency but even that still shows a noise floor of around a -75 most of the time at the AP.
2x mode is currently on, but we will try turning that off and see if we have any different results.
With such a crowded frequency up here, it's hard to find enough open ones to run even these three radios. Right now we're running 920, 906, 915 from SW to SE. This test SM is on the SE side.
I guess my question still is, should these be at a true plumbed 0 degrees?
On the bracket you will see the degrees indicated, make it plumb.
I had about 4 deg downtilt on my APs at 2500' and couldn't reach anybody beyond 5miles, made the AP's 0 deg and I'm now reaching customers at 18miles and the few customers I had at 3miles their speeds almost doubled.
Keep everything fairly plumb on the AP and SM side, if you need to tilt anything do it on the SM side.