Sound card modem for Amateur Radio AX25

Web page: http://extradio.sourceforge.net/extmodem.html

Windows Files

Precompiled Windows binaries (EXE) can be found here:

• http://sourceforge.net/projects/extradio/files/extmodem/

You may need the VC++ 2010 runtime, available here:

• http://www.microsoft.com/en-us/download/details.aspx?id=5555

Usage

Open a new terminal (Start-Execute-"cmd" on windows) and ask for the program's help:

extmodem-vcpp2010.exe --help

Allowed options:
  -h [ --help ]                produce help message
  -d [ --debug ]               produce debug messages
  --config-file arg            configuration file name
  --kiss-tcp-port arg (=6666)  set KISS TCP listening port
  --ptt-port arg (=/dev/ttyS0) set serial port PTT name
  --tx-delay arg (=200)        set tx-delay in ms
  --tx-tail arg (=50)          set tx-tail in ms

You should at least set the PTT Port, Usually COMx on Windows and /dev/ttySX on Linux and Unix.

The program prints the received packets on the screen.

It also opens a TCP KISS interface running at port 6666. You can use any TCP KISS capable program to send and receive packets, ie "aprx":

<interface>
  tcp-device 127.0.0.1 6666 KISS
  callsign LU0EXT-1
  tx-ok false
</interface>

Build from source

Linux, get the source

On your Linux terminal write:

git clone https://github.com/alejolp/extmodem.git

The source code should be at the "extmodem" directory.

Compile

On Linux systems you can compile with g++ using the "build.py" script. You need:

• Python to run the build script
• Boost C++ library development files
• PortAudio VERSION 19 library development files

On Debian and Ubuntu you can install the required packages easily:

aptitude install build-essential g++ portaudio19-dev libboost-system-dev libboost-thread-dev libboost-program-options-dev

Then just type, at the "extmodem" directory:

python build.py

The executable should be at bin/extradio

License

This program borrows code from Sivan Toledo's javAX25 and Thomas Sailer's multimon. Thank you folks!

Copyright (C) 2013 Alejandro Santos LU4EXT, alejolp@gmail.com.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.