FM RDS Stereo transmitter using gnuradio
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.
- USRP1 Universal Software Radio Peripheral with WBX RF daugtherboard (50MHz-2.2GHz) (can work also with Basic TX with minor modifications)
- Ubuntu Linux 10.04
- Gnuradio 3.3
- Jack open Audio connection kit
- gr-rds project on CGRAN
- Jack FM RDS Stereo gnuradio python script
- 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 Jack FM RDS Stereo gnuradio python script
- Create the .asoundrc file in your home directory, "jackplug" is mapping of jack source to ALSA, defined in .asoundrc file in home directory
- 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
TO DO: fine tuning of gains for composite signal.