User's Manual

LR-911 2.6H3
AWID PROPRIETARY
Page 9 9/26/2007
3 PREPARATION FOR INSTALLATION
3.1 SITE SURVEY
Always conduct a site survey before starting installation. Avoid any possible sources of
interference. If the reader is not installed properly, the performance will be degraded or
more seriously the reader may get damaged. Listed below are steps that should be
followed during installation:
• Do not install reader in an area where sources of broadband electromagnetic
noise may exist. Avoid mounting the reader facing a cellular phone tower or in close
proximity to the base station of a 900 MHz wireless telephone.
• Keep all of the Reader wiring at least 12 inches (30 cm) away from all other
wiring, including, but not limited to, AC power, computer data wiring, telephone
wiring, and wiring to electrical locking devices.
• Do not operate the reader in close proximity to other 900 MHz wireless
equipment/devices.
3.2 PREFERRED READER INSTALLATION PRACTICES
• Avoid mounting the reader under direct sunlight. Exposure to direct sunlight may
cause the reader to operate at a temperature above the 65 degrees Celsius
upper limit.
• Make sure that the supply voltage of the reader is within specification
• Use cables with over-all braid or shield
• For best results, run the cable in an individual conduit, in safe distance from AC
power, computer cables and cables for electrical locking devices
• Use recommended cable. Do not use any unshielded Twisted Pair type cable
• Use the largest wire gauge where feasible
• Use dedicated power supply, where necessary
• Use Single Point Grounding (Earthing) for block wire of cable. No ground loops.
Outer shield of cable should not be grounded.
3.3 MOUNTING PREFERENCE
The LR-911 has a uni-directional antenna with an antenna beam width of about 60-70
degrees. The radiation pattern is an oval-shaped beam, which should be aimed toward
where the transponders will pass. For best results, the antenna should be mounted on a
post; about 6 to 7 feet from pavement with the antenna angled slightly downward. With a
vehicle passing through the drive lane, the center of the antenna radiation pattern
should project to the windshield directly in front of the passenger or driver.
Install Readers for neighboring vehicle lanes so that the effective areas for detecting
tags do not intersect. Only one Reader should be able to read a tag at any location of