Installing the Encompass 4 Reader
4-39
zone. The antenna pattern, or read zone,
of the Encompass 4 Reader would look
roughly like a pear-shaped balloon if you were able to see it. When installing the
Encompass 4 Reader, you should first mark the unit’s read zone using the RF range set
at the factory-default maximum. You can later adjust the read zone using the tech-
niques discussed in “Fine-Tuning and Verifying the Read Zone” on page 8-19.
If two Encompass 4 Readers are installed near eac
h other, TransCore recommends that
you fine-tune each reader for the ideal read zone before connecting it permanently to
sense input/sense output and communications cables. A minimum of 2 MHz fre-
quency separation between the two adjacent readers is require
d for correct operation.
Required Materials
You need the following materials to mark the read zone:
• Test tags, supplied by the TransCore dealer or distributor
• Piece of windshield-type glass 0.190 to 0.230 inches (4.82 to 5.84 mm) in thick-
ness and approximately 12 inches (30.48 cm) square
on which to attach the eGo
Plus Sticker Tag, eGo Plus Security Sticker Tag, or eGo WST
Caution
Both the eGo Plus Sticker Tag and eGo WST have
a reduced read range when not
attached to glass.
• Audible circuit tester and 9V DC battery for circuit tester power as described in
the section “Bench Testing the Encompass 4 Reader Before Installation” on page
4-13.
• Piece of chalk or roll of tape
• Plastic or wooden yardstick for ATA or IAG tags
• Vinyl electrical tape or hook-and-loop material
Procedures
Note: Using test tags that are not mounted to vehicles give a general idea of the read
pattern but the pattern will vary somewhat when actual vehicles with tags are tested.
Final adjustments must be made with tags properly mounted on a variety of vehicles.
To mark the read zone
1. Confirm the following:
• You have correctly connected the
power supply as described “Connecting
the AC Power Supply” on page 4-9 and “Connecting the DC Power Supply”
on page 4-10.
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