Building a FM Receiver with the USRP and GNU Radio

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Overview

In this application note, a USRP N200/N210 SDR with a WBX daughterboard is used with GNU Radio to build a simple FM receiver. The intent of this example is to:

  • Teach some basic DSP and RF concepts including: filtering, demodulation, and sample rate conversion.
  • Show how to build graphical applications with GNU Radio Companion
  • Illustrate the simplicity of the software tools that can be used with the USRP product family.

Requirements

  • USRP with compatible daughterboard to receive 88-108 MHz
  • GNU Radio
  • UHD

UHD Source Block

FFT Sink

Low Pass Filter

WBFM Receive

Rational Resampler

Audio Sink

Wav File Sink

WX Widgets

You can download the sample GRC file here: http://files.ettus.com/app_notes/fm_rcvr/fm_example.grc

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