Forum: GNU Radio Real sampling with DBSRX (& more!)

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8e2ce39154545934067abed84daeee82?d=identicon&s=25 Davide Anastasia (Guest)
on 2007-05-14 11:00
(Received via mailing list)
Hi List,
is it possible to use only real sampling coming from the DBSRX?
Any one can send me the instruction to set correctly the VCO on the
MAX2118?

Thanks,
--
Davide Anastasia

web: http://www.davideanastasia.com/
email: s242248@studenti.ing.unipi.it
Bb3ff9c86361ea921a64632a4c46e824?d=identicon&s=25 Trond Danielsen (Guest)
on 2007-05-14 11:10
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2007/5/14, Davide Anastasia <s242248@studenti.ing.unipi.it>:
> Hi List,
> is it possible to use only real sampling coming from the DBSRX?

I am not sure if I understood your question correctly, but Is there a
reason why gr.complex_to_real() does not work? As long as you signal
is an appropriate IF, the real part of the complex signal should
contain all of the information.

Regards,
--
Trond Danielsen
8e2ce39154545934067abed84daeee82?d=identicon&s=25 Davide Anastasia (Guest)
on 2007-05-14 11:16
(Received via mailing list)
Il giorno lun, 14/05/2007 alle 11.09 +0200, Trond Danielsen ha scritto:
> > Hi List,
> > is it possible to use only real sampling coming from the DBSRX?
>
> I am not sure if I understood your question correctly, but Is there a
> reason why gr.complex_to_real() does not work?

Why not simply usrp.source_s()?
--
Davide Anastasia

web: http://www.davideanastasia.com/
email: s242248@studenti.ing.unipi.it
Bb3ff9c86361ea921a64632a4c46e824?d=identicon&s=25 Trond Danielsen (Guest)
on 2007-05-14 11:24
(Received via mailing list)
2007/5/14, Davide Anastasia <s242248@studenti.ing.unipi.it>:
> Il giorno lun, 14/05/2007 alle 11.09 +0200, Trond Danielsen ha scritto:
> > > Hi List,
> > > is it possible to use only real sampling coming from the DBSRX?
> >
> > I am not sure if I understood your question correctly, but Is there a
> > reason why gr.complex_to_real() does not work?
>
> Why not simply usrp.source_s()?

http://lists.gnu.org/archive/html/discuss-gnuradio...

Besides, floats are more convenient :)

--
Trond Danielsen
8e2ce39154545934067abed84daeee82?d=identicon&s=25 Davide Anastasia (Guest)
on 2007-05-14 11:36
(Received via mailing list)
Il giorno lun, 14/05/2007 alle 11.23 +0200, Trond Danielsen ha scritto:
>
> http://lists.gnu.org/archive/html/discuss-gnuradio...
>
> Besides, floats are more convenient :)

I'm not really sure I've understood what you want to tell me. Infact you
give me a link to a reply on a thread I open some times ago.
--
Davide Anastasia

web: http://www.davideanastasia.com/
email: s242248@studenti.ing.unipi.it
Bb3ff9c86361ea921a64632a4c46e824?d=identicon&s=25 Trond Danielsen (Guest)
on 2007-05-14 11:44
(Received via mailing list)
2007/5/14, Davide Anastasia <s242248@studenti.ing.unipi.it>:
> > > Why not simply usrp.source_s()?
> >
> > http://lists.gnu.org/archive/html/discuss-gnuradio...
> >
> > Besides, floats are more convenient :)
>
> I'm not really sure I've understood what you want to tell me. Infact you
> give me a link to a reply on a thread I open some times ago.

I only refered to Eric Blossoms statement that usrp.source_s is
broken, but I have not found anything regarding why it is broken. As I
said earlier, if you are just interested in the positive part of the
spectrum, then gr.complex_to_real should give you everything you need.

--
Trond Danielsen
745d8202ef5a58c1058d0e5395a78f9c?d=identicon&s=25 Eric Blossom (Guest)
on 2007-05-14 17:36
(Received via mailing list)
On Mon, May 14, 2007 at 11:15:41AM +0200, Davide Anastasia wrote:
> Il giorno lun, 14/05/2007 alle 11.09 +0200, Trond Danielsen ha scritto:
> > > Hi List,
> > > is it possible to use only real sampling coming from the DBSRX?
> >
> > I am not sure if I understood your question correctly, but Is there a
> > reason why gr.complex_to_real() does not work?
>
> Why not simply usrp.source_s()?

Because it doesn't really do what you think it does.

It really just return the raw data, completely uninterpreted, from the
USRP.  It should be called something other than usrp.source_s.

Eric
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