Low Pass Filter Example

This tutorial will describe how to use a low-pass filter in GNU Radio. The previous tutorial can be found here: Creating Your First Block

Creating the Flowgraph
Begin by adding the following blocks to the GRC work space:
 * 1) Signal Source
 * 2) Low Pass Filter
 * 3) Throttle
 * 4) QT GUI Frequency Sink
 * 5) QT GUI Range

Connect the blocks in the following manner:



The QT GUI Range block will be used to control the frequency of the Signal Source block. Double-click the QT GUI Range block and edit the properties:
 * Id: frequency
 * Default Value: 0
 * Start: -samp_rate/2
 * Stop: samp_rate/2



Double-click the Signal Source block and enter frequency from the QT GUI Range variable: