User's Manual

30
Copyright © 2004-2012 by InfiNet Wireless
III. Installation procedure
1. Installation preparations
Required components and accessories
Before the installation, please make sure you have all necessary parts and
accessories:
• InfiNet Wireless Device
• Antenna
• Low loss antenna cable for the required frequency range
• Antenna pole (if necessary)
• Required grounding system
• Accessories and tools
Antenna placement
When planning an antenna placement for PTP link, in order to obtain the
maximal coverage range and best performance for the Device, one need to
consider that LOS requirements must be fulfilled for the path between two
antennas. Moreover, it is of vital importance that the certain zone that surrounds
the signal propagation path must be free from obstructions. One should
understand that the radio beam is not as thin as, for example, laser beam. Radio
beam, also called as a 1
st
Fresnel zone, has a profile of a rugby ball. Its exact
form and size depend upon the frequency and the signal propagation path
length.
If most of the 1
st
Fresnel zone is obstructed, a major part of a electromagnetic
energy will be lost which leads to a severe signal quality degradation and, as a
result, to coverage range decreasing.
Below is an incomplete list of possible obstructions on the signal propagation
path:
• Neighboring buildings
• Trees
• Bridges
• Power lines
To obtain the best results, it is necessary to perform a precise analysis of a
signal propagation path zone and possible obstructions that may cover a part of
the 1
st
Fresnel zone (usually the analysis is performed at the highest points of
the signal propagation path).
When planning the antenna placement for Point-to-Multipoint connections, one
must consider the necessity of a circular or sector coverage areas. In this
respect, it is not recommended to use omni-directional antennas when sector
antennas can be used.
While planning, it is strongly recommended to consult high-qualified
and experienced technicians