Installing the Encompass 4 Reader
4-25
4. Remove the load or attenuator from the RF ca
ble and connect cable to reader.
Once the antenna is discharged and properly connec
ted to the reader, the reader
circuitry provides a DC path to keep any further charge from building up in the
antenna.
Caution
TransCore does not recommend using a screwdriv
er or other tool to short the
RF cable center conductor to the outer ground of the cable. This grounding
method can damage the center pin or the threads of the connector.
TransCore strongly advises that you use adequate Earth Ground
for this voltage
discharge procedure in accordance with the National Electric Code for the
locale where you are installing the Encompass 4 Reader.
Mounting the Antenna Curb-Side
Some site designs, for example those with curb-side antennas, require that the antenna
be mounted on a round pole. The pole must be a minimum of 2 inches (5 cm) in diam-
eter and should extend approximately 8 feet (2
.4 m) above the pavement level. The
pole must be installed according to local building codes.
Note: D
o not use an AA3152 Universal Toll Antenna for side-fire application.
Procedures
Use the following guidelines to mount an antenna on a curb-side round pole.
To mount the antenna to a curb-side pole
1. Follow the manufacturer’s directions to attach the antenna assembly to the pole
approximately 8 feet (2.4 m) above the
pavement surface.
2. Tighten slightly so that you can adjust the antenna
left or right but not so slightly
that the antenna slides down the pole.
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.
Figure 4-18 illustrates front and top views of a pole-mounted antenna with the approx-
imate measurements for sites where tags would be mounted on the interior driver
-side
windshield.
Note: Determine the r
ead zone before you tighten all screws and straps permanently.
Refer to the section “Marking the Read Zone” on page 4-38.
After mounting the antenna, you must connect it to the
Encompass 4 Reader. Follow
the procedures described previously in the section “Connecting the External Antenna”
on page 4-9.
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