OP25

*PLEASE NOTE - These instructions are outdated and only work with older versions of GNUradio, Ubuntu and OP25 - They will not work with current builds*

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:

{{{

sudo 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 libboost-all-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

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

make -j 4 CC=gcc-4.1 CXX=g++-4.1

sudo make install

}}}

6. And this part will setup the op25 source. 

{{{

cd ~/src

svn co http://op25.osmocom.org/svn/trunk@198 op25

cd op25/decoder

./bootstrap

./configure

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

sudo cp /usr/local/include/gnuradio/swig/* /usr/include/gnuradio/swig 

sudo cp /usr/local/include/gnuradio/* /usr/include/gnuradio/ 

cd ~/src/op25/imbe_vocoder

./bootstrap

./configure 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!