I think the clue is that it takes a analog signal in and outputs a
digital representation hence A/D.
If one follows the same procedure as when designing a RF-amp then it
will be a good thing. Only enough gain to overcome the circuit noise,
then your dynamic range is much better.
On Fri, 2006-06-09 at 05:31 -0700, FRANCIS CARCIA wrote:
> I use minimum gain in the op amps after the detector to get maximum dynamic
> range.
> BTW Sound card codec is an A/D. frank
>
> "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
> Alberto:
>
> Over at the very controversial group softrock40 group. I suggested once that
> they could add analog to digital convertors right after the quadrature
> detector and so they seemed to have took off on that idea for awhile. It
> seems like it was an idea some of them had also been previously pondering: I
> do not know. Anyways it seems like a logical evolution of the circuit ideas.
>
> I terms of software now. Would there be an advantage in using the A/D right
> after the detector in your view and could the signal still be sent through
> the sound card? I realize that this would one day mean a new kind of
> software. If it is not immediately advantagous to explore then we can just
> dismiss that idea till some other date.
>
> Anyways if the A/D idea is not something ready for SDR at this time then we
> need to focus on the analog output of the quadrature detector as it is and go
> from there. {Some are still fussing over what sort of technology to use as
> the local oscillator and bandpass tuner sections.} Yet some have looked at
> the idea now and so it will not be something new one day down the road. It
> seems however that some very fast digital radio communications could result
> from the idea. Yet, as with anything no doubt it will have its peculiar
> problems also.
>
> ka9rza
>
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> Yahoo! Groups Links
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>
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>
--
Cecil
KD5NWA
www.qrpradio.com
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