SmartBridges airClient Nexus PRO TOTAL Quick Installation Manual - page 21

Intelligent Wireless Nexus Platform

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Table 4- (below) is a guide to determine the amount of clearance to leave around the signal 

path. Install the bridge or external antenna where obstacles along the propagation path, 

including the ground, are no closer than these values.

Table 4- Fresnel Zone Clearance Guidelines for Frequencies

Total Path 

Length in Miles 

(kilometers)

Clearance Radius 

around Signal path  

in Feet (meters) 

2.4GHz

Clearance Radius 

around Signal Path 

in Feet (meters)

5.x GHz

4 (6)

27.6 (8.4)

7.9 (5.4)

6 (0)

33.8 (0.3)

22.0 (6.7)

8 (3)

39. (.9)

25.4 (7.7)

0 (6)

43.7 (3.3)

28.4 (8.6)

2 (20)

47.9 (4.5)

3. (9.4)

For more information on site survey techniques, please visit 

http://www.smartbridges.com/education/

Note: 

  Before proceeding to mount the units in the outdoor location, it is strongly  

  recommended that they be configured and tested on the bench first to ensure  

  that they operate satisfactorily. Please refer to the product User Guide for  

  configuration information.