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ArgentData OT3 APRS Tracker/Digipeater

The Tracker3 is the successor to our popular Tracker2 series. It features a much more powerful 32-bit processor with improved DSP capabilities, better telemetry support, USB, and more room for expansion.

  • Plots received positions as waypoints - APRS stations, objects, and items received over the air can be passed to a GPS receiver to be plotted on its map display. When used with a supported Garmin or Magellan GPS receiver, waypoints will be created with appropriate map symbols, comment text, and elevations.
  • KISS support - Use with any packet program that supports the standard KISS interface protocol.
  • APRS Digipeater - Supports multiple aliases, WIDEn-n and TRACEn-n style callsign substitution with dupe checking, hop count limiting, and optional preemption. May be used simultaneously with tracking and KISS functions.
  • Command console - A traditional TNC2-style serial console provides a simple, platform-independent configuration interface. Additionally, APRS station-to-station messages may be sent and received from the command line.
  • Remote control via APRS - Most of the commands available at the console may also be issued through APRS station-to-station text messages. This allows the unit to be reconfigured from anywhere in the world with APRS access. Access can be limited by callsign and through the use of a secure one-time-password scheme.
  • Upgradeable - Firmware updates are free and easy to install. Firmware images can be downloaded directly from the website with the Windows-based configuration utility, or they can be transferred to the unit from any XMODEM-capable terminal program for cross-platform compatibility.
  • Flexible and Expandable - Extra analog inputs and digital I/O lines, plus a Dallas 1-wire bus, allow connection of a wide variety of devices.
  • SmartBeaconing™ - APRS tracking with SmartBeaconing™ support for automatic beacon rate control, compressed format support for shorter packets and better precision, and timeslotting for efficient, coordinated channel usage.
  • Weather Station Support - Supports Peet Bros, AAG 1-wire, and LaCrosse WS-2300 series weather stations.
  • On-board temperature and voltage telemetry (OT2m only)
  • Scripting - A simple scripting and macro language allows a degree of flexibility and programmability not found in other trackers.
  • Dual serial ports (via splitter cable for OT3m, or front-panel data jack for T3-135).


  OT3m T3-135
Voltage DC 6.5 to 28V 5 volts (powered by radio)
Current 40 mA idle, 50 mA transmitting
350 mA @ 5 V available for GPS
40 mA idle, 50 mA transmitting
Modes 1200 bps AFSK (send and receive)
300 bps AFSK, PSK31 (send only)
1200 bps AFSK (send and receive)
300 bps AFSK, PSK31 (send only)
Radio Connector DB9 female (Kantronics pinout) internal
Serial Connector DB9 male (dual RS-232) Rear DB female, front 3.5mm jack
Dimensions 4.2" by 3.2" by 1" 2.3" by 1.4" by 0.3"
GPS Interface NMEA in/out, Garmin Binary NMEA in/out, Garmin Binary

Tracker3 model T3-Mini

The T3-Mini is a miniature version of the Tracker3 measuring 1.73"x1.12"x0.215" (44x29x5.5mm) and weighing 5.5 grams. It has all of the software features of the other Tracker3 models, and provides 4 analog inputs and 13 general-purpose digital I/O pins. Its serial ports can be configured for RS-232 or TTL operation.