The advent software defined radio: FM receiver with RTL SDR and GNU radio

In recent years, Software defined radio has become a cost efficient and reliable communication paradigm where it's RF front end is simplest as compared to the conventional SCR (software controlled radio). In this paper, we studied the technological revolution that is SDR communication system consists of an antenna contained with the RTL SDR USB dongle RTLU3832 and freeware GNU radio software support which highly reduce the limitations of the controlled radio. The SDR device are widely used to examine the radio Spectrum and digitize I/Q signals that are being transmitted in the range 25 MHz to 1.75 GHz by the digital communications community. The frequency bands that contains signals such as FM radio, ISM signals, GSM, 3G and LTE mobile radio, GPS, and so on can be sampled in this wide operating range. SDR give us wide scope to hold the experimentations on the real world signals with cost efficient hardware solution and GNU radio flowgraph. FM reception with SDR model is studied and illustrated with an example extent so that one can demonstrate and explore the desired frequency spectrum.