Linrad is an exciting SDR program by Leif Asbrink, SM5BSZ.

You can find out more about it at Leif's webpages:

http://www.sm5bsz.com/linuxdsp/linrad.htm or  http://www.sm5bsz.com/linuxdsp/linroot.htm

or at:

http://www.nitehawk.com/w3sz/linradbase.html

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W3SZ