User's Manual
Intelligent Wireless Nexus Platform
u n w i r i n g o u r w o r l d ™
17
Table 4-1 (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 4-1 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) 17.9 (5.4)
6 (10) 33.8 (10.3)
22.0 (6.7)
8 (13) 39.1 (11.9)
25.4 (7.7)
10 (16) 43.7 (13.3)
28.4 (8.6)
12 (20) 47.9 (14.5) 31.1 (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 congured and tested on the bench rst to ensure
that they operate satisfactorily. Please refer to the product User Guide for
conguration information.