This kit forms a simple yet effective radio receiver add-on for the Raspberry Pi for receiving amateur radio and other transmissions. It covers all the HF(shortwave) amateur and broadcast bands, as well as the medium wave (AM) and long wave broadcast bands.
It is capable of receiving SSB and CW(Morse) transmissions, as well as AM broadcast stations with some reduction in quality. The Pi-HF is primarily for frequencies between 130kHz and 30MHz, however it has a bandwidth over 100MHz and so will also perform at higher frequencies including the 50MHz(6m) and 70MHz(4m) amateur bands with reduced performance.
It is not a software-defined radio, instead it is a traditional direct conversion radio receiver with software control.
More details here.