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    How does it works

    A nice beginning are some of the articles is the link below.

    In particular the A Software Defined Radio for the Masses articles by Gerald Youngblood found towards the bottom of the page. http://www.arrl.org/tis/info/sdr.html

    Articles how Quadrature signals work.

    http://www.dspguru.com/info/tutor/quadsig.htm

    HP article on the basics of IQ digital data from/to a radio. http://www.home.agilent.com/agilent/redirector.jspx?action=ref&cname=AGILENT_EDITORIAL&ckey=1000000348%3Aepsg%3Aapn&lc=eng&cc=US

    A free book on how DSP works, an excellent book.

    http://www.dspguide.com/

    Math Simulation software SciLab, software for analyzing data and plotting the results, very capable, can work with .WAV files as data. http://www.scilab.org/

    Modeler for SciLab

    http://www.scicos.org/

    SciLab Tricks and tips.

    http://kiwi.emse.fr/SCILAB/sci-bot/book1.htm

    SciLab Toolboxes

    http://www.scilab.org/contrib/index_contrib.php?page=listdyn.php&order=date

    Octave another math modeler

    http://www.gnu.org/software/octave/

    Talk and models by Phil Hartman from talk at Dayton, it uses Excel to model SDR software, a good source of equations for the programs mentioned above. http://www.hamsdr.com/dnld.aspx