[Discuss-gnuradio] Robert Kelley: Richard Hosking's quadrature DDS board

[John Gilmore]

FYI

Date: Mon, 31 Dec 2001 18:10:39 -0800 (PST)
From: Robert Kelley <address@hidden>
Subject: Richard Hosking's quadrature DDS board

http://members.iinet.net.au/~richardh/Direct%20Digital%20Synthesizer%20using%20the%20AD9854%20quadrature%20DDS.htm

This is an excellent building block for software defined radio.
There is nothing like it that I have been able to find.  Add a
pair of mixers and feed the results into a sound card and it should
be possible to implement a generic receiver up to 70 MHz or so.
A pair of phase-locked loops might be useful to clean up spurious
signals, however.  I have heard that the M-Audio Delta 44 is the
best available sound card for these purposes, short of instrument
grade ADC's that are out of the reach of most people.

http://www.midiman.net/products/m-audio/delta44.php