075-2000-30 rev 1.5 Orion Electronics Limited 3
Chapter 1 Introduction
1.1 Overview
This manual covers the confi guration and operation of the HT550 Javelin remote unit (Figure 1.1.0) and
HT500 Radio Base Station (Figure 1.1.1). The HT550 Javelin is a covert GPS tracking device which
communicates via a 2.4 Ghz Spread Spectrum link over short to medium ranges. Special attention has been
paid to ensure that the HT550 Javelin is as small as possible, allowing body worn use. Real time tracking of
multiple Javelin devices is possible, as well as other operational modes covered in this manual.
The HT500 Base Station works in conjunction with the HT550 Javelin remote unit to provide users with an
extremely fl exible tracking kit. The manner in which the 2 devices communicate is based on Communication
Groups that are setup and managed in the Confi guration Database. Proper set up and usage of these
Communication Groups is what allows various Base Stations and remote units to communicate. Please see
Chapter 6 for more detailed information on setting up the Confi guration Database.
The HT550 Javelin remote unit has 3 modes of operation: Low-Power Real Time, Real-Time and User
Initiated.
Low-Power Real-Time
If confi gured to operate in this mode, the radio transmitter is turned off between fi xes to prolong battery life.
In addition, the GPS receiver is turned off between fi xes if an external GPS antenna is connected.
Real-Time
Orion has implemented an innovative real time methodology to ensure that the Javelin only sends pertinent
information when operating in a Real Time Mode. GPS fi xes are taken, stored and sent based on several
user defi nable parameters. Default values for the following parameters are used if no specifi c values are
programmed by the user.
GPS fi xes are recorded whenever:
• a specifi ed time out is reached
• a certain distance has been travelled
• the remote’s bearing has changed by a certain angle
User-Initiated
The HT550 Javelin can be confi gured to record and transmit a GPS fi x when a specifi c input switch is
triggered.
Figure 1.1.0
Figure 1.1.1
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