GNU Radio is a free software toolkit for learning about, building, and deploying Software-defined radio.

It does signal processing in free software. This means you can learn from it and modify it to do new things. The big idea is to give ordinary software people easy access to hack the electromagnetic spectrum, that is, to understand the radio spectrum and think of clever ways to use it.

GNU Radio offers reconfigurability. Spending $1000 on a piece of radio hardware buys you access to whatever that particular radio is configured for. If you have adequate generic hardware, the radio processing can be done in software. Currently only a few forms of radio are duplicated in GNU Radio software, but if you understand the math of a radio transmission system, you can reconfigure your GNU Radio to receive it.

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