Dire Wolf

Soundcard Packet TNC, APRS Digipeater, IGate, APRStt gateway

Dire Wolf - Decoded Information from Radio Emissions for Windows Or Linux Fans



This page will be disappearing on October 8, 2015.  Comcast announcded that the personal web page service will be discontinued.  (They didn't mention anything about my bill going down to compensate for loss of this feature.)  


The new location will be https://github.com/wb2osz/direwolf. If you have any links to this current location, please update those links  to use the new location.  If you got here by following a link on some other page, please contact the owner to have the link updated,  Thanks for your patience during the transition.


And now, back to our regularly scheduled program... 



In the early days of Amateur Packet Radio, it was necessary to use a “Terminal Node Controller” (TNC) with specialized hardware.  Those days are gone.  You can now get better results at lower cost by connecting your radio to the “soundcard” interface of a computer and running free software.


Dire Wolf is a software "soundcard" modem/TNC and APRS * encoder/decoder.   It can be used stand-alone to observe APRS traffic, as a digipeater, APRStt gateway, or Internet Gateway (IGate).    It can also be used as a virtual TNC for other applications such as APRSIS32UI-View32XastirAPRS-TWYAACUISSLinux AX25SARTrackRMS Express, and many others.




  • Lower cost, higher performance alternative to hardware TNC.
  • Version 1.2 decodes more than 1000 error-free frames from WA8LMF TNC Test CD.  
  • Ideal for building a Raspberry Pi digipeater & IGate.
  • 300, 1200, and 9600 baud operation.
  • Interface with applications by

      - AGW network protocol

      - KISS serial port

      - KISS network protocol

  •  Decoding of received information for troubleshooting.
  • Logging and conversion to GPX file format.
  •  Beaconing for yourself or other nearby entities.
  • GPS Tracker (Linux version only).
  • Very flexible Digipeating with routing and filtering between up to 6 ports.
  • APRStt gateway - converts touch tone sequences to APRS objects.
  • APRS Internet Gateway (IGate) with IPv6 support.
  • Compatible with software defined radios (SDR) such as gqrx  and rtl_fm.
  • Includes separate raw packet decoder, decode_aprs.
  • Open source so you can see how it works and make your own modifications.
  • Runs in 2 different environments:

      - Microsoft Windows XP or later

      - Linux, regular PC or single board computer such as Raspberry Pi, BeagleBone Black, or cubieboard 2


Join the conversation in these groups!


Dire Wolf packet TNC 

Raspberry Pi 4 Ham Radio

TAPR aprssig


 * APRS is a registered trademark of APRS Software and Bob Bruninga, WB4APR.