Determining Range & | 3 |
| |
Clearance |
|
The Fresnel Zone
As identified in Chapter 2 - Installation Guidelines, you need a clear
NOTE |
A wireless outdoor antenna connection that lacks sufficient clearance will suffer from poor performance. When radio performance is poor, the network response is poor as well, due to many retransmission attempts of lost data frames.
In Chapter 2, we described the shape of the radio beam (Fresnel Zone) as being bulged in the middle. The exact shape and width of the Fresnel Zone is determined by the path length and frequency of the radio signal.
If any significant part of the Fresnel Zone is obstructed, a portion of radio energy is lost, resulting in reduced performance. For optimal performance, you must ensure that the antenna products you choose, in combination with the height of the antenna installation above ground, will provide sufficient clearance to allow your antenna installation to cover the distance between the two wireless sites.
Outdoor Antenna Installation Guide |