" 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 " (source: Wikipedia, the free encyclopedia : https://en.wikipedia.org/wiki/Software-defined_radio).
Claudio Re I1RFQ and Oscar Steila IK1XPV started CIAOradio project in August 2003. The target is to build an HF receiver learning how to use SDR techniques.
H101 was one of the firsts Hamradio SDR receiver.
Historical articles and links:
7° Convention Digital & Radio Communications i-LINK Renon 2005 (slides, 2005 - Italian )
Ciao Radio H101 - IK1QLD (2005 - Italian )
Radio & Communication Info: CiaoRadio, la nuova frontiera (provata) (2006 - Italian )
Ham Station IWØHK: Sistel Ciaoradio H101: test-set e ricevitore hf Sdr (2006 - Italian )