User's Manual

VTU-3 Users Guide
Page 12 of 18
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that the display and the receiver unit are communicating. After the word “Scanning”
appears on the screen the different ICONs can start to be displayed indicating that the
system is communicating and receiving signals from different sources.
2.1 Background:
VTU-3 is an extensive redesign of the LoJack Police Tracking Computer (PTCII) used for
stolen vehicle recovery. The redesign effort was initiated for several reasons as follows:
• Enhanced performance would be incorporated into a redesign
• Easier operation would be achieved with a redesign
• New features would be incorporated into a redesign. Configuration:
2.2 Configuration:
VTU-3 consists of an antenna array, an electronics chassis, a control and display head,
and cabling between these components.
2.3 Installation:
• Installation of the antenna array is by drilling 4 holes (3/4" diameter) into the roof of a
tracking vehicle. The holes are in a square pattern in the middle of the roof or away
from other equipment such as other antennas or light bars.
• Installation of the VTU-3 electronics chassis is by mounting the chassis in the trunk or
rear storage (boot) of the vehicle.
• The cabling between the antenna array and the electronics chassis is between the
roof liner and the roof, into the trunk and the cables plug into the electronics chassis.
• Power wiring (+12V and ground) is on a separate connector on the electronics
chassis.
• Installation of the VTU-3 Control and Display head is on the dashboard or attached to
the roof over the rear view mirror. A mounting bracket is provided.
• The data cable is connected between the electronics chassis and the Control and
Display head. The connectors are RJ-11 (phone) type.
2.4 Operation:
Overall operation with regard to front panel controls is very simple. This can be seen from
the fact that there are few controls on the front panel.
Power-on self-test is performed automatically. The test takes only about 1-2 seconds and
then the unit displays READY for an additional second.
The only control necessary is the volume control. The volume is adjusted via up/down
buttons. An audio tone is presented during adjustment.
The SCAN button is only used when a second VLU is present. The unit automatically sets
the SCAN mode correctly during normal operation.