Software-defined radio (SDR) is a radio communication system where components that have been typically implemented in hardware (e.g. mixers, filters, amplifiers, modulators/demodulators, detectors, etc.) are instead implemented by means of software on a personal computer or embedded system. While the concept of SDR is not new, the rapidly evolving capabilities of digital electronics render practical many processes which used to be only theoretically possible.
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- main driver is RTL-SDR from the fine Osmocom guys.
- General receiver linrad (see tutorial in Hungarian attached) also see linrad for newcomers
- receive air traffic identification: gr-air-modes
Other SDR HW is listed here
Buy it, Build it.
For shortwave try these: