4RF Aprisa XE User Manual page 27

Corner Reflector Antennas
Antenna Siting
When siting antennas, consider the following points:
A site with a clear line of sight to the remote terminal is needed. Pay particular attention to trees,
buildings, and other obstructions close to the antenna site.
Any large flat areas that reflect RF energy along the link path, for instance, water, could cause
multipath fading. If the link path crosses a feature that is likely to cause RF reflections, shield the
antenna from the reflected signals by positioning it on the far side of the roof of the equipment
shelter or other structure.
The antenna site should be as far as possible from other potential sources of RF interference such as
electrical equipment, power lines and roads.
The antenna site should be as close as possible to the equipment shelter.
Note: Wide angle and zoom photographs taken at the proposed antenna location (looking down the
proposed path), can be useful when considering the best mounting positions.
Factor
Frequency
Gain
Wind loading
Tower aperture required
Size
Front to back ratio
Beamwidth
Cost
Example of a clear line-of-sight path
Example of a mid-path reflection path
Aprisa XE User Manual
Explanation
Often used in 330-960 MHz bands
Typically 10 dBd
Less than a parabolic grid antenna
About the same as a parabolic grid
antenna
Range from 0.36 m to 0.75 m in length
High (typically 30 dB)
Broad (up to 60°)
Medium
Preparation | 25