Re: [linrad] audio channels

[Edson Pereira <edson@xxxxxxxxxxxxxxxxx]

Hi Arie,

For good performance, the soundcard should have very little distortion,
good balance between channels, very low crosstalk, very good dynamic
range, and also very low noise. It is not easy to find soundcards that
meets the criteria above. I have tested some not so cheap soundcards that
have lots of internaly generated birdies, some have higher noise levels in
on channel than the other, some have interference only when there is high
CPU usage, some don't have anti-aliasing filters, etc. The cost of a
soundcard also does not directly reflects que quality, but the number of
"features", which in most cases are not used. 

-- Edson, 7n4ncl

On Fri, 23 May 2003, Arie Dogterom wrote:

> Hallo Edson,
> 
> Thank you for confirming my expectations. Interesting is how good the
> channel separation must be. Bus as Leif anyhow corrects the amplitude and
> phase shif errors, he probably als compensates for crosstalk.
> 73
> Arie
> 
> ----- Original Message -----
> From: Edson Pereira <edson@xxxxxxxxxxxxx>
> To: <linrad@xxxxxxxxxxxxxxxxxxxxxx>
> Sent: Friday, May 23, 2003 5:05 PM
> Subject: Re: [linrad] audio channels
> 
> 
> >
> > Hi Arie,
> >
> > You can connect the soundcard left and right line input to the IQ
> > downcoverter outputs. If you use two soundcards, you will have problems in
> > synchronizing the ADCs (unless you use the same clock source for both
> > soundcards). Just be sure to adjust the signal levels to meet the range of
> > your soundcard.
> >
> > 73,
> >
> > -- Edson, 7n4ncl
> >
> > On Fri, 23 May 2003, Arie Dogterom wrote:
> >
> > > Hello,
> > > My question probably has been answered in some of the texts, but I a
> still
> > > unsure :
> > >
> > > Having the mixers with the I an Q outputs, where shall those go : Does
> one
> > > need two soundcards or is it possible to use the left and right channels
> of
> > > a stereo card?
> > > 73
> > > Arie
> > >
> > >
> >
> 
> 



LINRADDARNIL