A software-defined radio system, or SDR, is a radio communication system where components that have been typically implemented in hardware (eg mixers, filters, amplifiers, modulators/demodulators, detectors, etc.) are instead implemented by means of software on a personal computer or embedded computing devices. 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. (see more goo.gl I used a Samsung Galaxy 2 with gISDR Android app by Alex Lee Shing Cheung for a test, and found very good result. Actually, the app require SDR service from a server which selectable from the app. There are features that can be found on the high-end HF receivers such DSP, Filters, Modes, Band, Scope etc which work well on my phone. You can try this free app from Google play, amateur radio catagory. Have fun!
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