Installing the IT2200 Reader System
4-21
To install the UTA
1. Locate the UTA that will be used as the transmit antenna below the mounting
pipe and insert a U-bolt around the pole and down through the bracket on the side
of the antenna closest to the center of the lane. Place a lock washer and nut over
each side of the U-bolt, but do not tighten the nuts. Repeat for the other U-bolt,
but install two of the supplied spacers between the bracket and the antenna to
angle the antenna toward the center of the lane.
2. For bistatic installation, mount the second UTA the same way, but mount it on
the other side of the RF module from the transmit antenna and do not add
spacers.
3. Rotate each antenna up and toward oncoming traffic. Rotate up 15° from
horizontal for a dedicated lane or 10° up for a mixed-use lane. Use an
inclinometer to check the angle.
4. Tighten nuts with torque wrench to 68 N-m (50 ft-lb).
5. Slide the shrink tubing over the coaxial cable, but do not heat it.
6. Connect the coaxial cable to the antenna and to the appropriate connector on the
RF module. Leave the shrink tubing loose until you have finished tuning the lane.
Installing the AA3153 Beacon Antenna
Two beacon antennas are required for each lane in a bistatic configuration. One bea-
con antenna is required for each lane in a monostatic configuration.
A mounting kit is provided with each antenna that includes:
• Antenna
• Two U-bolts
• Two brackets
• Four spacers
• Eight nuts
• Four lock washers
• One length of heat-shrink tubing
Figure 4-16 shows the correct way to mount an AA3153 antenna.
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