This video shows the build and test of a Softrock Lite II software defined radio (SDR) kit. A short tutorial is given on each sub-circuit as it is being built and systematically tested. Details of the assembly process are shown, as well as live test results. The completed kit is then hooked up to a dipole antenna and a PC, and some CW signals are demodulated off the air.
More info about this kit (which is several years old now) can be found here:
http://www.wb5rvz.org/softrock_lite_ii/
The HDSDR software shown at the end of the video is found here:
http://www.hdsdr.de/
To learn more about the basics of IQ (quadrature) signals, you may want to read this blog post:
http://www.tek.com/blog/what%E2%80%99s-your-iq-%E2%80%93-about-quadrature-signals%E2%80%A6
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