View source for Implementation of a Simple FM Receiver in GNU Radio

==Application Note Number==
'''AN-5501'''

==Revision History==
{| class="wikitable"
!Date
!Author
!Details
|-
|style="text-align:center;"| 2016-05-01   
|style="text-align:center;"| Neel Pandeya
|style="text-align:center;"| Initial creation
|}

==Abstract==
This AN shows a quick and simple implementation of an FM receiver for the USRP using GNU Radio. The goal is to easily demonstrate a practical application, and to verify that the USRP is functioning properly. 

==Overview==
In this application note, a Universal Software Radio Peripheral (USRP™) N200/N210 and 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 

==Blocks==
===UHD Source Block===
* Configures USRP
* Receives data stream from USRP 

===FFT Sink===
* Display Fast Fourier Transform of data stream

===Low Pass Filter===
* Apply low pass filter to data stream
* Optional: Decimation or Interpolation

===WBFM Receive===
* Demodulates Wide Band Frequency Modulated signal from data stream

===Rational Resampler===
* Decimate or Interpolate data stream to desired sample rate

===Audio Sink===
* Audio hardware interface
* Optional: Decimate Audio Rate

===Wav File Sink===
* Save data stream as WAV file type

===WX Widgets===
* Textbox - Input field
* Slider - Adjustable slider
* Notebook - Assign Widgets/GUI Sinks to tabs within flowgraph

===Variable===
* Creates variable within flowgraph

==Video==
https://www.youtube.com/watch?v=KWeY2yqwVA0

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

[[Category:Application Notes]]