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 FOXTRAK :: APRS Tracker


APRS Tracker & GPS Encoder: FoxTrak (Rev0110)
FoxTrak Original Version
PIC16F84A APRS Tracker & GPS Encoder: FoxTrak-M
Advance APRS Terminal & Tracker: FoxView2
VixenTrak: GPS-less APRS Position Encoder for FoxView2
FoxDigi: 1200baud APRS Tracker/Modem/TNC



CQ Ham Radio Japan

Radio Magazine Greece

Visit JA1OGS Webpage here
 Radio Amateurs Making their own FoxTrak & Setups



W5DUG Scooter Trak Setup!!


FoxTrak Basic Project page is here........


  PIC 16F84A APRS Tracker : GPS Encoder REV0110

Track APRS Stations On-Line Locate, Track positions of APRS Stations On-line



Few changes on new REV 0110 PCB:

1. Dual color LED for CD/GPS

2. SMT Parts replaced by standard.


The Schematic & Technical Information presented here generates an APRS signal with very little effort. Itís a TinyTrak type of tracker hardware with small changes, where all functions are controlled by PIC16F84A.

The position data in NMEA format ( $GPRMC ) delivered from a GPS is decoded and a 1200 bps packet radio signal is generated from it. This can be fed directly into a Radio Transmitter without the need of an expensive TNC. Because of not having enough program memory left on PIC & to make hardware simple, circuit does not decode received APRS signals.

This APRS interface has a serial interface for connecting to the GPS and for configuration of user parameters into PICís memory.

The main new features compared to TinyTrak (Byonics) besides some hardware variations is, speed dependable beacon rates and beacon transmissions at major course changes.

Suitable Firmware for this type of hardware is developed by many radio amateurs. One tested in this project is by DK7IN who has also made a nice Linux based configuration utility to write user parameters in PIC. However, TinyTrak's windows configuration utility may also be used for the same purpose. A Linux version is available for download.

Other firmware, developed by PE1RXQ may also be used with added operational benefits. However, this was not tried by me on first proto board. There is also a way to convert this tracker into a Data Tracker, please visit the links provided below, where more information may be found.

In addition to above basic hardware & pre-programmed PIC supplied with kits, my main intention is to make available economical APRS tracker hardware/PCBs to Radio amateurs, who wish to further develop their own type of APRS Trackers.

Since FoxTrak may be configured for various firmware, you may update FoxTrak with a better & smarter Firmware & if necessary, change the PIC, to 16F628A. The Basic hardware remains the same.

FoxTrak uses two independent regulators. One for Tracker & other for GPS. 78L05 for Tracker and 7805 for GPS

Both FoxTrak D9 Sockets, Radio Side(F) & RS232/GPS side(M), have same pin connection plan as used by TinyTrak & Open tracker


Completed FoxTrak: Without Case
Click image to enlarge


Foxtrak is now available with a Powder Coated Metal Case:


  More Pictures: Bottom View   Bottom side view in case


 FoxTrak Doc & Schematic:

Technical Info Doc
Schematic & Parts List
Kit Parts List



Last Version (1008) documents are here:  


 Config Programs & Firmware Download


PIC16F84A Firmware



  Development & Optional Firmware for FoxTrak
Jeroen, PE1RXQ APRS Tracker Firmware

Rolf Bleher/DK7IN APRS Firmware Project Page

Data Track : For BALLOONISTS



 DOS, Windows & Linux Configuration Programs




FT-R Kits NO LONGER available
Please consider: FoxTrak Basic.......
PCB May be available from our School Project website


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