Proxim TSUNAMI CPN 65756B User Manual

The outdoor installation of the link (point-to-point or point-to-multipoint) requires the following: 

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An antenna 

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A low-loss antenna cable (available in three lengths) 

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Antenna mast or wall bracket for the antenna 

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An adequate grounding system that meets the requirements described in “Grounding System.”  

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Waterproofing of all connections 

Note:  All outdoor cable connectors must be sealed with weatherproofing stretch tape to make the coax 

connectors permanently waterproof.  See “Sealing the Cable Connectors” on page 29. 

 

To achieve maximum performance of your wireless outdoor link, the outdoor antenna must have clear line-

of-sight to the antenna of the other Tsunami MP.11a unit. Although the MP.11a radio signal can work well 

without line-of-sight in urban environments, where the signal is transported by reflection instead of being 

direct, the best results are achieved in line-of-sight conditions.  

Line-of-sight can be defined as: 

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No obstacles in the direct path between the antennas (antenna beam). 

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No obstacles within a defined zone around the antenna beam. 

You should be aware that the shape of an antenna beam is not straight and narrow like a laser beam.  The 

rugby ball.   

The exact shape and width of the Fresnel Zone is determined by the path length and frequency of the radio 

signal.  The width as distance from the direct antenna beam is approximately 6 m (21 ft) in the middle of the 

wireless link for a distance of 6.5 Km (4 mi) and a frequency of 5.8 GHz.  This width also is the required 

clearance of the antenna beam from obstacles in its path, to avoid loss of radio signal. 

                                                      

1

Pronounced as ‘Fray-Nell’ 

 

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