Installation guide

Tsunami MP.11 Antenna Installation Guide
29
4
Determining Range and Clearance
See the following sections:
• Determining the Outdoor Range
– Maximum Range
– Clearance Factor
• Calculations
– Calculating Link Budget
Determining the Outdoor Range
The range of your outdoor antenna installation is closely related to a number of different factors. To let you determine the
range of the antenna system in your situation, use the following formula:
Range = Maximum Range x Clearance Factor
where:
• Maximum Range is the theoretical maximum that can be achieved under optimal circumstances using the available
Tsunami MP.16 products according to their specifications and in compliance with local radio regulations.
• Clearance Factor is a correction value (in percentage) that should be used in case the signal path of your wireless
link does not provide the minimum clearance as listed in the Maximum Range table (see Clearance Factor).
NOTE: You also can use a calculation sheet provided by Proxim to generate an estimate of link distance and reliability.
Maximum Range
The maximum range of your system is based upon:
• The type of outdoor antenna equipment
• The data speed of the wireless link
• The clearance of the signal path (see Clearance Factor)
• The values in this section are based upon calculations that assume optimal radio conditions. They do not represent
a guarantee that the same maximum distance can be achieved at your location. Differences in performance figures
can result from:
– Incorrect alignment of antennas (see Aligning the Antenna)
– Polarization mismatch of the antennas
– Sources of interference or unexpected reflections in the signal path that affect the communications quality (see
Determining Optimal Antenna Placement)
– Severe weather conditions such as heavy rain or snow fall, or strong winds
– Unexpected obstacles in the link path
– Seasonal influences such as leaves on trees, or icing on the antennas
Clearance Factor
For optimal performance of your outdoor wireless link, the signal path between the BSU and SU must provide sufficient
clearance.
NOTE: An outdoor wireless link that lacks sufficient clearance will suffer from poor performance, which is typically
perceived as slow network response times. Although your radio equipment automatically retransmits every lost