OP25j

These instructions were compiled in January 2010, and revised in April 2010 with a few minor changes. These directions are fairly explicit, so that even those with little Linux experience should be able to follow along. Please note you'll need a decent processor to get a discriminator tap decode to work -- I'd guess at least a dual core CPU running at 2.4GHz+. This isn't a project for your five year old laptop to tackle.

Here's what's worked for me, based on op25 svn revision 198:

1. Install Ubuntu 9.10

Upon reboot, login and launch a terminal window (Applications -> Accessories -> Terminal), and run the rest of the following instructions from this window.

2. The next commands will update your system with the latest patches: {{{
apt-get upgrade
sudo shutdown -r now
}}}

3. After the system reboots, relaunch the terminal window as above and continue with these commands, which will install the gnuradio prerequisites:

{{{
sudo apt-get install gcc-4.1 g++-4.1 swig g++ automake libtool \
python-dev libfftw3-dev libcppunit-dev libboost1.38-dev libusb-dev \
fort77 sdcc sdcc-libraries libsdl1.2-dev python-wxgtk2.8 subversion \
git-core guile-1.8-dev libqt4-dev python-numpy ccache python-opengl \
libgsl0-dev python-cheetah python-lxml doxygen qt4-dev-tools \
libqwt5-qt4-dev libqwtplot3d-qt4-dev pyqt4-dev-tools libitpp-dev \
libjack-dev texlive-latex-base
}}}

4. This next part installs gnuradio:

{{{
mkdir ~/src; cd ~/src
wget ftp://ftp.gnu.org/gnu/gnuradio/gnuradio-3.2.2.tar.gz
tar zxvf gnuradio-3.2.2.tar.gz
cd gnuradio-3.2.2
./configure --prefix=/usr
make -j 4 CC=gcc-4.1 CXX=g++-4.1
make check
sudo make install
}}}

5. This part installs the gr-fsk4 demodulator:

{{{
cd ~/src
wget http://radiorausch.googlepages.com/gr-fsk4-22Apr08.tar.gz -O gr-fsk4-22Apr08.tar.gz
tar zxvf gr-fsk4-22Apr08.tar.gz
cd gr-fsk4
./bootstrap
./configure --prefix=/usr
make -j 4 CC=gcc-4.1 CXX=g++-4.1
sudo make install
}}}

6. And this part will setup the op25 source. Note that as of now, you need a login to get the source. Reply "yes" to prompts that ask if you want to save your password. And don't worry about the error about the folder not being empty when issuing the mv commands - I'll clean this up soon.

{{{
cd ~/src
svn --username YourUsername co http://sedition.org.au/svn/op25/trunk@198 op25
cd op25/decoder
./bootstrap
./configure --prefix=/usr
make -j 4 CC=gcc-4.1 CXX=g++-4.1
sed -i 's/flow_graph/top_block/' src/python/qa_op25.py
make check
sudo make install

1. sudo cp /usr/include/gnuradio/swig/* /usr/include/gnuradio/swig -- not necessary any longer?
2. sudo cp /usr/include/gnuradio/* /usr/include/gnuradio/ -- not necessary any longer?

cd ~/src/op25/imbe_vocoder
./bootstrap
./configure --prefix=/usr CXXFLAGS="-O3"
make -j 4 CC=gcc-4.1 CXX=g++-4.1
sudo make install

echo -e "[wxgui]\nstyle=nongl\nfft_rate=4\n" > ~/.gnuradio/config.conf
}}}

7. You should be done ready to run the app. Plug your scanner into the mic input. Launch the sound mixer (under System -> Preferences -> Sound) and make sure you can see the signal coming in from the discriminator tap of the scanner.

{{{
cd ~/src/op25/python
./audio_p25_rx.py -a
}}}

This last bit is up to you. Poke around the interface, read the rest of the wiki and mailing list, and, well, good luck!