Installing the Encompass 4 Reader
4-27
Mounting the Antenna Overhead
Some site designs require that the antenna be mounted in an overhead location.
Procedures
To mount the antenna in an overhead location
1. Follow the manufacturer’s directions to a
ttach the antenna assembly to the
overhead location at approximately 18 feet above the pavement surface.
2. Tighten slightly so that you can adjust th
e antenna up and down but not so
slightly that there is a risk of the antenna falling.
3. Adjust the assembly by pointing the antenna to
the middle of the area where tags
will be read, and while in this position, tighten all screws and fastenings slightly.
Note: Adjust
the antenna to provide the most direct line of sight to the tags.
For example, in toll lanes the Universal T
oll Antenna (UTA) would be installed
approximately 15 degrees from the vertical.
Figure 4-19 illustrates an overhead-mounted antenna with approximate measurements
for the read zone.
Figure 4-19 Encompass 4 Reader Installation with Overhead Antenna
Note: Determine the read zone before you tighten all screws and straps permanently.
Refer to the section “Marking the Read Zone” on page 4-38.
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