User's Manual

AZALEA MSR4000 INSTALLATION GUIDE

4 Antenna Installation

4.1 Principles

z Height of antenna installation:

¾ The antennas height can be different even for antennas connected to same

MSR4000. It would be determined by the space of installation, or by design requirement;

¾ The antenna height for access could be 20 meters in open and flat area of city. It

could be 30 meters in open area in rural flat area;

¾ Too high antenna installation will decrease the coverage capability close to antenna,

it is much popular when using omni antennas;

¾ Too high antenna installation will have another negative impact for system

performance by interference to sites in surrounding areas. Its signal strength will be seen

by many other sites, which is hard to avoid interference.

z Antenna azimuth:

¾ The main beam of antenna should point to the most dense traffic area to have better

coverage and link quality;

¾ The overlapping coverage between two neighboring site should be less than 10% of

its total coverage area in urban scenario;

¾ Overlapping area should not be too large in suburban and country area as well, and

the angle of two neighboring antenna main beam should not be less than 90 degree;

¾ To avoid over coverage of an antenna, the antenna main beam should not point to

the center of straight streets.

It should notice that the coverage capability changed if the azimuth of antenna adjusted, to

improve coverage in one direction will give negative impact to other direction. The proper

azimuth is very important in network building up stage.

z Antenna down-tilt angle design:

¾ Down-tilt is widely used to have better coverage and less interference to neighboring

sites;

¾ The down-tilt angle should be well designed, too high down-tilt will impact antenna

beam form, and have the negative impact of coverage;

¾ The design of down-tilt antenna angle should consider the output power, antenna

height, target coverage area, radio environment, etc. It should be done after site survey.