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This guide demonstrates the process of installing and running the 0uternet SDR
demodulator and decoder software on a desktop Linux operating system. As of
this writing, only 64-bit versions of Linux are supported. 32-bit version are
in the works.
As part of the software repository, a Vagrantfile is provided for use with
Vagrant and VirtualBox. This file can be used to (automatically)
install and run all the required software on any computer that supports
VirtualBox (including Windows and OSX).
Warning
This guide is a work in progress and may contain wrong and/or incomplete
information. Please use the issue tracker or
our forums to discuss any problems you
encounter.
The scripts in the repository including any example scripts found in the
documentation folder are released under GNU GPL version 3 or any later
version. See COPYING for more information, or visit the GPL homepage.
The documentation, except example scripts found in the docs directory, is
released under GNU FDL version 1.3 or any later version. See COPYING.docs for
more information, or visit the FDL homepage.
The files that are datacast by Outernet are encoded, modulated, and uplinked to
several Inmarsat satellites. These satellites transmit the radio waves in the
L-band frequency range. The waves are
received by a radio on your receiver and then passed on to the software
demodulator. The demodulator turns the analog signal into bits and then passes
them onto the decoder, which extracts the file information from the data and
reconstructs the files on local storage.
The software components involved in this process are the software demodulator
(sdr100) and the decoder (ondd).
Despite this software coming from a single vendor, they don’t come as a
single package for the reasons of flexibility and so that various components
can be replaced by others with same or similar functionality in future. Because
of this, much of this guide is going to be about ensuring that these pieces of
software work together.
Note
Although these pieces of software are all part of the Outernet software
eco-system, which is predominantly open-source, the demodulator and decoder
are closed-source freeware.
The relevant license files are installed in /usr/local/share/outernet
folder by the installer.
The software involved in this set-up is meant to be used as long-running
background processes (a.k.a. daemons). Some of the programs already provide
features that let them run as proper well-behaved daemons, while others do not.
We will not discuss daemonizing any of the programs in this guide.
Documentation about command line options will be provided as appropriate, but
daemonization (or conversion into proper system services) is going to be left
to you as an exercise.
In a proper Outernet receiver, there are usually a few more components, like
the web-based user interface software. Since the purpose of such software is to
provide access to files from outside the receiver, they will not be covered in
this guide. It is assumed that, on regular desktop Linux, the user will have
enough options for getting access to files locally.
Installing the Outernet software in a virtual machine¶
Warning
Please not that this method of running the Outernet L-band software has not
yet been confirmed as working. We are leaving the instructions and
associated files here in case they happen to work for you. (And we would
defintiely like to know about it, too!)
The Outernet software can be run within a virtual machine on platforms
supported by VirtualBox. As of this writing, this
includes Linux, Windows, OSX, OpenSolaris, and OpenBSD.
Note
It is highly recommended to use this set-up on a CPU that supports hardware
virtualization technologies.
Once the required software is installed, download the Outernet
demodulator/decoder kit,
and unzip it. Open a console and navigate to the folder which contains the
unpacked files. For example, on Windows:
C:\> cd \path\to\outernet-linux-lband-master
C:\path\to\outernet-linux-lband-master> vagrant up
On Linux and other Unix-like or Unix systems, the commands are exactly the
same:
$ cd /path/to/outernet-linux-lband-master
$ vagrant up
After downloading all the base image, a VirtualBox virtual machine is created
and brought up. The machine is accessed using SSH.
Common RTL-SDR USB dongles are configured to be forwarded to the virtual
machine, so plugging them in should be enough to make them usable within the
virtual machine.
Note
While the virtual machine is running, you will not be able to use the radio
USB dongles on the host system.
To access the operating system running within the virtual machine, run:
$ vagrant ssh
If you are on Windows, and you don’t have OpenSSH installed, you can use PuTTY. In the host name field, type in
vagrant@localhost, and type 2222 in the port field.
In this section, we will install all the necessary software and ensure the
system is prepared to run it. The next section will discuss the programs’
usage.
$ wget https://github.com/Outernet-Project/outernet-linux-lband/archive/master.tar.gz -O outernet.tar.gz
$ tar xvf outernet.tar.gz
To install:
$ cd outernet-linux-lband-master
$ sudo ./installer.sh
During installation, you will be asked to decide whether you wish to configure
udev. By default, access to the SDR dongles is restricted to root. The udev
rules relax these rules so that any user can acess them.
You will also be asked to create the temporary download folder as well as the
download folder. The temporary download folder is used to store incomplete
downloads, while the download folder is the final destination for the
downloaded files. You can chose to create these folders later by youself, or
have the installer create them (default).
Warning
If the installer is asked to create the download folders, the created
folders will be world-writable (any user will have read-write access to
them).
The demodulator needs a few parameters so it knows how to set up the tuner. The
demod-presets command makes this easier by providing presets for the known
frequencies. If you run this command without any arguments, you will get a list
of presets (among other things):
$ demod-presets
Usage:
/usr/local/bin/demod-presets PROFILE
/usr/local/bin/demod-presets update
parameters:
PROFILE name of the tuner profile
update fetch the latest profiles
supported profiles:
americas North and South Americas
euraf Europe, Africa, Middle East
apac Asia, Pacific
Pick a preset for your region and run demod-presets again. For example,
let’s run it with euraf preset:
The L-band presets used by demod-presets command may change from time to
time. The program has an update feature which you can use to fetch the updated
presets. To use this feature, run:
It will take a while for the files to arrive, so please be patient. You may
also need to adjust the antenna so it’s pointed correctly. Antenna pointing is
outside the scope of this guide, though. The best place to ask for help
regarding this is our forum.
When successfully downloaded, files should appear in the output directory. If
you used the values from this guide, that’s /srv/downloads.
This section contains some common issues and known ways to fix them. Note that
no two machines are exactly the same, and therefore some problems may have more
than one root cause. If a fix listed here does not work for you, please ask for
help in the Outernet forum or, if you’ve
found a fix, please file a bug report.
This is normal for some Linux distros, and should not cause any issues. If you
are still having some problem, it is more likely not because of this warning
message.
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for (var i=0; iThank you! Your comment will show up '
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\``code``
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and an indented block after blank line