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OsmoSDR is a 100% Free Software based small form-factor
inexpensive SDR (Software Defined Radio) project.
If you are familiar with existing SDR receivers,
then OsmoSDR can be thought of something in between
a FunCube Dongle (only 96kHz bandwidth) and a USRP
(much more expensive).
For a very cheap SDR (with limited dynamic range),
you can use the DVB-T USB stick using the RTL2832U chip,
as documented in rtl-sdr.
It consists of a USB-attached Hardware, associated Firmware
as well as GrOsmoSDR gnuradio integration on the PC.