Hier Blocks and Parameters

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This tutorial describes how to create a hierarchical block, or Hier block, in GRC. The previous tutorial, Creating Your First Block, demonstrates how to create your first GNU Radio block using the Embedded Python Block.

Creating a Flowgraph

A hier block is used to encapsulate and simplify multiple GNU Radio blocks into a single block. The example hier block will be a frequency shifter block which multiplies a Signal Source against an input signal.

The first step is creating the flowgraph. Drag and drop the following blocks into the workspace:

  1. Signal Source
  2. Multiply
  3. Throttle
  4. QT GUI Frequency Sink
  5. QT GUI Range

Connect the blocks: