Encompass 4 Reader System Guide
2-8
If the Encompass 4 Reader is installed in an overhead location, optimal tag pos
ition is
in the top center of the windshield in the area behind the rear view mirror or on the
vehicle’s front license plate or center bumper as illustrated in Figure 2-5.
Figure 2-5 Typical Tag Positions Used with Overhead Reader
Note: Metallized coatings on some vehicle windshields and windows shield the RF
energy emitted by the Encompass 4 Reader and may cause tags to be misread. Many
metallized windshields have areas that are not metallized in which the tag can be
placed and reasonable results achieved. If there are no openings in the metallized
coating in which to install an interior tag, install exterior-type tags on the exterior of
the vehicle.
Refer to Chapter Chapter 3, ”Choosing, Install
ing, and Removing Tags” for more
detailed information on
tag positioning.
Antenna Selection
This section contains guidelines that assist in antenna selection for an Encompass
4 Reader installation that uses an external antenna
. The following antennas are com-
patible with the Encompass 4 Re
ader installation.
AA3100 Yagi (without radome)
Appropriate for installations with the following requirements and conditions:
• 902 to 928 MHz operation
• Non-icing environments
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