Hewlett Packard Enterprise Company MSR4000DFS Manuale Utente

| Installation Guide

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Check the topology of the land between the antennas using topographical maps, aerial photos, or even 
satellite image data (software packages are available that may include this information for your area)

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Avoid a path that may incur temporary blockage due to the movement of cars, trains, or aircraft.

A reliable wireless bridge or mesh link is usually best achieved by mounting the antennas at each end high 
enough for a clear radio line of sight between them. The minimum height required depends on the distance 
of the link, obstacles that may be in the path, topology of the terrain, and the curvature of the earth (for 
links over 3 miles).

For long-distance links, the router may have to be mounted on masts or poles that are tall enough to attain 
the minimum required clearance. Use the following table to estimate the required minimum clearance 
above the ground or path obstruction (for 5 GHz bridge links).

Table 4  Antenna Minimum Height and Clearance Requirements

0.25 mile (0.402 km)

4.6 ft (1.4 m)

0.007 ft (0.002 m)

4.6 ft (1.4 m)

0.5 mile (0.805 km)

6.2 ft (1.9 m)

0.03 ft (0.010 m)

6.2 ft (1.9 m)

1 mile (1.6 km)

8.9 ft (2.7 m)

0.13 ft (0.04 m)

8.9 ft (2.7 m)

2 miles (3.2 km)

12.5 ft (3.8 m)

0.5 ft (0.15 m)

13.1 ft (4.0 m)

3 miles (4.8 km)

15.4 ft (4.7 m)

1.0 ft (0.3 m)

16.4 ft (5.0 m)

4 miles (6.4 km)

17.7 ft (5.4 m)

2.0 ft (0.6 m)

19.7 ft (6.0 m)

5 miles (8 km)

20 ft (6.1 m)

3.0 ft (0.9 m)

23 ft (7.0 m)

7 miles (11.3 km)

23.6 ft (7.2 m)

6.2 ft (1.9 m)

30 ft (9.1 m)

9 miles (14.5 km)

27 ft (8.2 m)

10.2 ft (3.1 m)

37 ft (11.3 m)

12 miles (19.3 km)

30.8 ft (9.4 m)

18.0 ft (5.5 m)

49 ft (14.9 m)

15 miles (24.1 km)

34.4 ft

 

(10.5 m)

28.0 ft (8.5 m)

62.7 ft (19.1 m)

To avoid any obstruction along the path, the height of the object must be added to the minimum clearance required 

for a clear radio line of sight. Consider the following simple example, illustrated in 

.