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

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