Encompass 4 Reader System Guide
2-12
Unobstructed Line of Sight
For optimum readability, install the Encompass 4 Reader antenna and the vehicle’s tag
so that when the vehicle approaches the antenna, the tag is directly facing the antenna
and the line of sight is clear between the antenna and the tag. If a fence or barrier is
between the tag and the antenna, the antenna cannot reliably read the tags.
Figure 2-2
illustrates possible installation locations of an Encompass 4 Reader antenna in relation
to a tag’s mounting location on a vehicle. If the tags are not in the recommended loca
-
tion, reliable optimum operation requires lower vehicle speeds.
Site Layout and Traffic Flow
The following site layout and traffic flow considerations are critical when determining
Encompass 4 Reader installation locations:
• The Encompass 4 Reader read zone
• Other Encompass 4 Reader units and antennas in the area
• Lane configurations
• Reflection, refraction, and diffraction of RF signals
• Existing signal interference at the site
The Encompass 4 Reader Read Zone
The Encompass 4 Reader must be able to read the tag data properly within a specified
area, called the read zone, without reading other nearby tags or interfering with other
Encompass 4 Readers at the site. The following are some of the factors that affect the
size and shape of the read zone:
• Mounting method used (pole or wall mount)
• Mounting location (overhead or side mount)
• Height from the ground and mounting angle
• Mounting method used (pole or wall mount) of the antenna
• Mounting location (overhead or side mount) of the antenna
• Height from the ground and mounting angle of the antenna
• Indoor or outdoor location
• RF output attenuation
• Range discrimination setting
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