3 Installation Antenna
1
．
Principles of height of antenna installation:
The antennas height for a MSR2000 site could be different. It would be
determined by the apace of installation, and some times it is because of
network design;
The antenna height for access could be 20meters in open and flat area of
city. It could be 30meters in open area in rural flat area;
Too high antenna will decrease the coverage capability close to antenna, it
is much popular when using omni antennas;
Too high antenna will have another negative impact for system
performance by interference to sites in surrounding areas. Its signal
strength will reach very far away to interfere other sites.
2
．
Principles of Antenna azimuth:
The main beam of antenna should point to the most dense traffic area to
have better coverage and link quality;
The overlapping coverage between two neighboring site should be less
than 10% of its total coverage area in urban scenario;
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;
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.
3
．
The principles of antenna down-tilt angle desing:
Down-tilt is widely used to have better coverage and less interference to
neighboring sites;