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Information on the setup a software defined FM RDS Stereo transmitter using Gnuradio. It has been made from the integration of a stereo transmitter (opendigitalradio.org), gr-rds project on CGRAN and design from CRC. [[Image:Screenshot-FM-RDS transmitter.png|thumbnail|FM RDS Stereo transmitter]] ===Hardware=== *PC *USRP1 Universal Software Radio Peripheral with WBX RF daugtherboard (50MHz-2.2GHz) (can work also with Basic TX with minor modifications) ===Software=== *Ubuntu Linux 10.04 *Gnuradio 3.3 *Jack open Audio connection kit *[https://www.cgran.org/wiki/RDS gr-rds project on CGRAN] (by Dimitrios Symeonidis ) *[http://www.opendigitalradio.org/files/jack_crc_fm_rds_tx.py Jack FM RDS Stereo gnuradio python script] ===Setup=== *Download and install all software mentioned in the previous section *Download and install gr-rds project (run also install-grc.sh script in src/grc to install components for gnuradio companion, optional) *Download the [http://www.opendigitalradio.org/files/jack_crc_fm_rds_tx.py Jack FM RDS Stereo gnuradio python script] *Create the .asoundrc file in your home directory, "jackplug" is [http://www.alsa-project.org/main/index.php/Asoundrc#JACK_plugin mapping of jack source to ALSA], defined in .asoundrc file in home directory ===Startup procedure=== *Power and connect USRP1, with wbx board installed in A side (can be changed with minor modification to the script) *Start jack audio server using Jack Control (you need to have install jack audio server and tools) *Start Jack FM RDS Stereo gnuradio python script *Window will appear with the different settings to control frequency and gains of FM composite signal components *By default (depending on .asoundrc file) all source will be connected to the default system audio input (laptop microphone in general) *Play the audio of the content you want to broadcast on jack, for example, if you take an internet radio stream: mplayer -ao jack http://maxxima.mine.nu:8000 *Connect the output of jack source to the input of gnuradio software transmitter using "connections" in JACK control That's it TO DO: fine tuning of gains for composite signal. ===Source=== [[Image:Jack crc fm rds tx.grc.png|300px]] *[http://www.opendigitalradio.org/files/jack_crc_fm_rds_tx.py Python script] can be modified directly. *Gnuradio companion source file can be found [http://www.opendigitalradio.org/files/jack_crc_fm_rds_tx.grc HERE]

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