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AID
  
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TX-602D
Tracking beacon

TX-602D is a motion sensing tracking transmitter, also known as a tracking beacon, introduced around 1995 by Audio Intelligence Devices (AID) in Dearfield Beach (Florida, USA). It was intended for mounting under a suspect's vehicle, so that it's movements could be tracked unobtrusively.

The device is housed in a die-cast aluminium enclosure that measures 125 × 60 × 50 mm, with three strong magnets mounted at the top to allow it to be affixed to the bottom of a vehicle. When the device is not in use, a metal plate is placed over the magnets to retain their strength.

The device is powered by three 9V batteries and delivers an output power of approx. 1 Watt. A short center-loaded antenna – tuned to the selected frequency – must be connected to the BNC connector at the side of the device. In most situations it will be hanging down at a 90° angle.
  

The transmitter is enabled by setting the power switch – protected by a plastic ring – to the ON position. Once enabled, it will transmit a short pulse train at regular intervals. As soon as the vehicle starts moving, the intervals between the pulse trains becomes shorter. This triggers the alarm of the RX-360 receiver. The number of pulses in a single pulse train, and the interval between two pulse trains, can be configured with DIP switches in the battery compartment [A].

TX-602D tracking transmitter - bottom view
TX-602D tracking transmitter with magnet -  top view
Top side with magnet exposed
Interior
Three 9V batteries installed
Centre loaded antenna
Antenna
TX-602D beacon with antenna
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TX-602D tracking transmitter - bottom view
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TX-602D tracking transmitter with magnet -  top view
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Top side with magnet exposed
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Interior
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Three 9V batteries installed
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Centre loaded antenna
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Antenna
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TX-602D beacon with antenna

Compatible receivers
RX-360 receiver, part of the Bird Dog 360XT tracking system
Features
The image below provides an overview of the features of the TX-602D transmitter. The device is housed in a die-cast aluminium enclosure with a lid that is held in place by four Phillips screws at the corners. Attached to the lid are three strong magnets by which it can be mounted to a vehile. The magnets are covered by a metal plate to ensure that their strength is retained when the de­vice is not in use. This plate must be re­moved before deploying the transmitter in an operation.


Inside the device is a battery compartment for three parallel connected 9V alkaline batteries. Note that, once the batteries are installed, there is a gap at the bottom-end of the batteries, which must be filled with a piece of foam to prevent them from falling out when the target moves.

At the bottom of the battery compartment is a DIP-switch array with a programming table, used for configuring the transmitted pulse train. Further instruction are inside the case lid. A silicone sealant must be applied to the edges of the case before refitting the lid, to protect the contents againt water. Before turning it ON, a suitable antenna MUST be connected to the BNC socket.

Opening the transmitter
Interior
Open transmitter
Battery compartment
Interior
Three 9V batteries installed
Top view with batteries installed
Gap behind batteries
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Opening the transmitter
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Interior
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Open transmitter
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Battery compartment
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Interior
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Three 9V batteries installed
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Top view with batteries installed
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Gap behind batteries

Specifications
  • Device
    Tracking beacon
  • Purpose
    Vehicle tracking
  • Manufacturer
    Audio Intelligence Devices (AID)
  • Model
    TX-602D
  • Years
    1995-2004 (est.)
  • Frequency
    Spot frequency in 150-174 MHz band
  • Operation
    Crystal
  • Modulation
    Pulsed CW
  • Output
    1W
  • Power
    3 × 9V alkaline battery (type 1604)
  • Duration
    6 days continuous operation @ 20°C
  • Mount
    Magnet
  • Dimensions
    125 × 60 × 50 mm
  • Weight
    792 g
Documentation
  1. TX-602D Motion Sensing Tracking Transmitter - Operating Instructions
    Audio Intelligence Devices. 99219/90034-72. Rev. 3, April 2002.
Further information
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Crypto Museum. Created: Saturday 20 January 2024. Last changed: Monday, 22 January 2024 - 12:59 CET.
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