Re: [Discuss-gnuradio] Live fm detection gr-inspector

[Sebastian Müller]

I just noticed something else:
The USRP sample rate is set to 500kHz, not 20MHz. So you are only
looking at 2.5 % of the target spectrum! It is also possible, that
there are just no signals in that particular section.

Best,

Sebastian Müller
address@hidden
PGP ID DC2AA3EE

Am 13. Juni 2019 um 20:20:24, Sebastian Müller (address@hidden) schrieb:
> Hi Daniel,
>
> from what you tell us, I conclude this is not an issue with gr-inspector but 
> rather with
> generally receiving signals.
> If you use the QT GUI Sink for instance instead, you will see the same 
> (empty) spectrum.
> I would recommend to try and get better reception, until you can distinguish 
> signals
> visually in the spectrum manually. Are you using the correct antenna for this 
> frequency
> range? Is this antenna positioned in a beneficial location for reception? 
> Have you played
> around with the Rx gain of the USRP?
>
> Best,
>
> Sebastian Müller
> address@hidden
> PGP ID DC2AA3EE
>
> Am 13. Juni 2019 um 19:10:59, Daniel Andres Palacios (address@hidden) schrieb:
> > Thanks for your reply
> >
> > I trying to detect and classify all fm transmitted stations in my country,
> > with the gr-inspector OOT.
> > In my country (Colombia) it goes from 87,9 to 107.9 MHZ.
> > I only have an USRP B200 and think that if I set the center frequency at 98
> > MHZ and put a bandwidth of 20MHZ its posible to get my goal. But actually
> > im not getting signals detected
> > [image: Captura de pantalla de 2019-06-13 11-17-05.png]
> >
> > On Tue, Jun 11, 2019 at 12:53 PM Müller, Marcus (CEL)
> > wrote:
> >
> > > Hi Daniel,
> > >
> > > please remember to be specific when asking a question: "best way" is a
> > > bit ambiguous, and "I'm not getting a good result" definitely is
> > > insufficient for us to help you make things work better. What doesn't
> > > work sufficiently well? What happens instead?
> > >
> > > Best regards,
> > > Marcus
> > >
> > > On Tue, 2019-06-11 at 12:36 -0500, Daniel Andres Palacios wrote:
> > > > Hi to everyone.
> > > >
> > > > What is the best way to receive all fm modifications. I'm usigin an B200
> > > USRP.
> > > > I think that putting the center frequency at 98M and a bandwidth of 20M
> > > is a good way,but I'm not getting a good result.
> > > >
> > > > The idea is to detect all fm center frequencies using gr-inspector
> > > > _______________________________________________
> > > > Discuss-gnuradio mailing list
> > > > address@hidden
> > > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> > >
> >
> >
> > --
> > *Daniel Andrés Palacios Carabalí*
> > *Student of Telemathics engineering*
> > *Icesi University- Cali, Colombia*
> > *===========================*
> > *Estudiante de Ingeniería Telemática*
> > *Universidad Icesi. - Cali, Colombia*
> > _______________________________________________
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> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> >
>