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

From: smoerk
Subject: Re: [Discuss-gnuradio] Robert Kelley: Richard Hosking's quadrature DDS board
Date: Wed, 02 Jan 2002 11:25:37 +0100

could you explain the relationship between this DDS board an a

How expensive is it, if you build it by yourself?

On Tue, 01 Jan 2002 17:02:06 -0800, John Gilmore wrote:

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