SDR with HackRF One (Lesson 4: Mysteries)

Lesson 4 Overview

  • Lesson 2 homework review
  • Sample rates
  • Throttle block
  • The Atari effect
  • Negative frequencies
  • Data types
  • Quantization error

In order to clearly see my screen during the demonstration, viewing the video in full screen mode may help. Even better: You can download this video in high resolution (720p). (torrent)


  1. Start with the flowgraph from the lesson 2 homework. Add a scope sink.
  2. How do the scope and FFT change if you change the data type of every block from complex to float?
  3. When using the float data type, what happens if you specify a negative source frequency? How does that differ from the behavior when using the complex data type?

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