User`s guide
Appendix
User’s Guide 9-24 BreezeNET PRO.11 Series
• Interference
Interference may be caused by another system on the same frequency range,
external noise, or some other co-located system.
7KH/LQHRI6LJKW&RQFHSW
An optical line of sight exists if an imaginary straight line can be drawn connecting
the antennas on either side of the link.
Clear Line of Sight
A clear line of sight exists when no physical objects obstruct viewing one antenna
from the location of the other antenna.
A radio wave clear line of sight exists if a defined area around the optical line of
sight (Fresnel Zone) is clear of obstacles.
Fresnel Zone
The Fresnel zone is the area of a circle around the line of sight.
The Fresnel Zone is defined as follows:
Figure 9-12. Fresnel Zone
R
= ½ √
(λxD)
R: radius of the first Fresnel zone
λ:
wavelength
D: distance between sites