Wi Lan Inc EB03 Manuale Utente
Antenna Basics
JUL 2001 Rev 03
125
Minimal Clearance Above Obstructions
For the AWE 120-24, the absolute minimum clearance above obstructions requirements are as follows (in
meters):
meters):
@ 2.4 GHz
Some example clearance requirements for 2.4 GHz links follow.
Note: There is also a correction factor to compensate for curvature of the earth. This correction factor is
not required when the correction value is negligible < 10 km.
Installing Antennas
Ensure the following conditions.
•
Dipole antennas are oriented vertically (point up).
•
Antennas for the system have the same polarity (vertical, horizontal or circular).
•
Connectors attaching the coaxial cable to the antenna are properly weatherproofed.
•
A drip loop is formed at the building entrance to prevent water flowing down the coaxial cable and
entering the installation building.
entering the installation building.
•
The coaxial cable is secured to the supporting structure at one meter intervals to prevent wind
damage and frost loading problems.
damage and frost loading problems.
•
The antenna is firmly attached to the mast to prevent it from falling, yet has some flexibility so you
can move the antenna to fine-tune its position.
can move the antenna to fine-tune its position.
Distance
(km)
Clearance
(m)
Distance
(miles)
Clearance
(ft)
0.5
2.4
0.5
10.0
1
3.4
1
14.3
2
4.9
2
20.5
3
6.0
3
25.7
5
8.0
5
34.9
8
10.6
8
48.3
10
12.3
10
57.6
15
16.6
15
83.8
WARNING
Antennas must be installed professionally to ensure that the antenna operates properly
and follows accepted safety, electrical, grounding and civil engineering standards.
3.4m
d
km
×
!