FP Wireless LLC LRT01 Manuel D’Utilisation
1
KERI SYSTEMS, INC.
PRELIMINARY LRT-1 LONG RANGE VEHICLE SYSTEM
SINGLE LANE INSTALLATION GUIDE
The Keri Systems LRT-1 is a long range vehicle identification system capable of controlling one
entrance. It consists of an Antenna Assembly located near the roadway, a transponder attached to the
windshield and a receiver that can be located nearby, such as in a guard house. The receiver will output
formatted data to the access controller via cabling.
windshield and a receiver that can be located nearby, such as in a guard house. The receiver will output
formatted data to the access controller via cabling.
The transponder can be activated and read at up to 25’ away from the antenna assembly. The
antenna assembly consists of a transmitter housed in an IP67 rated outdoor housing and a yagi antenna.
Drawing 1 shows a block diagram of the system to help in your planning.
TRANSPONDER INSTALLATION –
The transponder should be located in either the lower right hand corner of the windshield, upper
right hand corner of windshield or directly behind the rear view mirror (Check with local vehicle code
regulations to determine where it may not be legally mounted.) Different vehicles and situations may
require any one of the above. For best performance, transponder should be mounted with longer side
parallel to dash of vehicle. It can be attached to windshield with adhesive material furnished, or other
less permanent attachments if security requirements permit.
ANTENNA INSTALLATION –
regulations to determine where it may not be legally mounted.) Different vehicles and situations may
require any one of the above. For best performance, transponder should be mounted with longer side
parallel to dash of vehicle. It can be attached to windshield with adhesive material furnished, or other
less permanent attachments if security requirements permit.
ANTENNA INSTALLATION –
The antenna assembly is designed to be mounted along side the vehicle lane. The yagi antenna
should be mounted on a pipe support with the transmitter located as close as practical.
This antenna should be near the edge of the road, but far enough removed to prevent vehicles
hitting it. Normally 2 – 4 ft. works well. The recommended height of the antenna is 6 – 9 ft. 7 ft is high
enough to prevent interference from shrubs, pedestrians, etc. Higher than 9 ft. may reduce range on
some vehicles, such as sports cars. If this is to be used only on trucks and other high riding vehicles the
height can be increased for optimum performance.
enough to prevent interference from shrubs, pedestrians, etc. Higher than 9 ft. may reduce range on
some vehicles, such as sports cars. If this is to be used only on trucks and other high riding vehicles the
height can be increased for optimum performance.
Horizontal orientation should be done so that the center of the pattern is directed a few feet from
the right edge of road where the windshield transponder will be located. See Drawing 2.
Vertical orientation should be adjusted to locate center of the pattern at the average height above
the road of the windshield transponders, at a distance of 20 – 25 ft/ from the antenna.
The yagi antenna comes with a reverse polarity SMA connector in order to connect it directly to
our transmitter.