GUILLAUME WILLIAM
BRES
Software Defined Radio:
Testing my new RTL-SDR USU dongle by tuning to a Frequency Modulated carrier.
RTL-SDR USB dongles are simple TV-SAT receivers (2GHz wide band). I will later try to decode more advanced protocols such as AIS and ACARS.
In this application, Gnuradio is the only software running, it real-time decodes the Frequency Modulation of the signal.
Later, I will have to write some piece of code between the receiver and the sound card.
The wbfm decoding flow graph:
RF data are provided by the RTL-SDR source block. The Rational Resample block is a simple decimation (1/4) which feeds a low pass and the Wide Band Frequency Demodulator. To feed the audio sound card we need to provide a common sound card frequency, right now I am using 48kHz.
A simple antenna & the USB dongle:
