The SDR (Software Defined Radio) is the key breakthrough that makes OpenBTS possible from a hardware perspective. SDRs have been used in military applications for about 20 years, only recently have they become available to a wider audience due to the decreasing cost of the technology along with the emergence of new SDR applications and hardware vendors.
OpenBTS-GSM (2.5G) supports SDRs from vendors such as Ettus Research, Fairwaves, and Nuand, as well as Range Networks’ SDR1, which is found in its development kit and base station products, and whose design files have been open-sourced and can be found below and at Github. If you choose a product which connects via Ethernet, make sure your Linux server has a dedicated Ethernet port for the radio.
Open Source Software-Defined Radio Design Files
The Range Networks SDR1 consists of two individual PCBs that work in tandem, referred to as the SDR module and the RF module (or board). The SDR module provides signal processing and digital data transfer between the RF signals and the host. The RF module provides the wireless transmission of the data. The SDR and RF module boards are each on a 5.5″ x 3.25″ PCB outline. This is a stacked design with a single interface connector between them. The RF module uses the same PCB layout with different component stuffing options and is capable of supporting the following frequency bands: 850, 900, 1800, 1900 MHz. The SDR1 is based in large part on the USRP1 design.
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YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the “copyright” line and a pointer to where the full notice is found.
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:
Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w’.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c’ for details.
The hypothetical commands `show w’ and `show c’ should show the appropriate
parts of the General Public License. Of course, the commands you use may
be called something other than `show w’ and `show c’; they could even be
mouse-clicks or menu items–whatever suits your program.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a “copyright disclaimer” for the program, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision’ (which makes passes at compilers) written by James Hacker.
, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License.