User's Guide

Installation
User's Guide 2-6 BreezeNET BU-DS.11/RB-DS.11
2.6 Outdoor Installation Considerations
This chapter describes various considerations to take into account when planning an outdoor
installation including site selection, antenna alignment, antenna polarization, antenna seal, and cell
size.
2.6.1 Co-locating DS.11 Outdoor Units
Up to 3 BU-DS.11 or RB-DS.11 units can be co-located on the same building top or tower. Each
unit is assigned to one of the non-overlapping channels, 1, 6, or 11.
When co-locating outdoor units on the same building top or tower, the antennas should be mounted
at least 2 feet apart when using UNI-16’s, 15 feet when using UNI-24’s, and 75 feet when using
OMNI-8’s. For omni antennas, the maximum link distance is reduced by up to 50%. Greater
separation will improve the link distance.
2.6.2 Site Selection Factors
When selecting a location for external antennas, remember to take into consideration the following
guidelines:
•1 Minimum distance between sites
•2 Maximum height above the ground
•3 Maximum line of sight clearance
Path of Clearest Propagation
A propagation path is the path that signals traverse between the antennas of any two bridges. The
“line” between two antenna sites is an imaginary straight line, which may be drawn between the two
antennas. Any obstacles in the path of the “line” degrade the propagation path. The best propagation
path is, therefore, a clear line of sight with good clearance between the “line” and any physical
obstacle.
Physical Obstacles
Any physical object in the path between two bridges can cause signal attenuation. Common
obstructions are buildings and trees. Any buildings or other physical structure such as trees,
mountains or other natural geographic features higher than the antenna and situated in the path
between the two sites can constitute obstructions. Install outdoor antennas high enough to avoid any
obstacles, which may block the signal.