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 3 Choosing, Installing, Removing Tags” on page 3–20 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 compatible with the
Encompass 4 Reader installation.
AA3100 Yagi (without radome)
Appropriate for installations with the following requirements and conditions:
• 902 to 928 MHz operation
• Non-icing environments
• Relatively symmetrical reading range
• Antenna profile not a major consideration
AA3101 Yagi (with radome)
Appropriate for installations with the following requirements and conditions:
• 902 to 928 MHz operation
• Exposure to harsh environments
• Relatively symmetrical reading range
• Antenna profile not a major consideration
AA3110 Parapanel
Appropriate for installations with the following requirements and conditions:
• 902 to 928 MHz operation
• Exposure to harsh environments
• Broad radiation pattern in one dimension, narrow in the other
• Low antenna profile
• Horizontal polarization
Chapter 2 Developing the Site Plan
TransCore Proprietary
2–9
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