"You need a radio to play with GNU Radio" is the most common misconception. There would be more fun if you have one, but GNU Radio itself doesn't require a radi

"You need a radio to play with GNU Radio" is the most common misconception. There would be more fun if you have one, but GNU Radio itself doesn't require a radio. It's actually a general-propose signal processing and simulation tool, and a lot of things can be done without hardware. For example, you can simulate different modulation techniques and observe them in time and frequency domain, or you can simulate an amplifier and change its the input level on an interactive GUI control panel you programmed to understand how an overdriven/saturated amplifier produces intermodulation distortion, or experimenting with different transmitter/receiver architecture (superheterodyne, direct conversion, etc). Traditionally, these experiments can only be done in a lab with a scope and a spectrum analyzer. But now it's all possible on your desktop.