Thanks for the response. I am actually new in this area.  it happens
around18th  sample And I don't know whether it gets the signal and then
lose it or it is just DC offset ? Does it catch any signal?

cheers,
RP

On Mon, Oct 31, 2016 at 3:21 PM, Martin Braun <martin.br...@ettus.com>
wrote:

> Is this at the beginning of a burst receive? It might be the DC offset
> removal filter. You can try disabling that with set_auto_dc_offset(false).
>
> Cheers,
> M
>
> On 10/31/2016 12:29 PM, Roohollah Parvizi wrote:
> > Hello, all----
> >
> >
> > I am using USRP N210 with SBX daughterboard 400-4400 MH and GPSDO,
> > for recording the  GNSS signal (L1 frequency=1575.42 MHz ). I tried to
> > record the signal from GNSS simulator. So I have these problems;
> >
> > 1: I don't know why samples of data go to 1500 and then fluctuates
> > between 1000 and -1000. It then falls and starts to fluctuate between 40
> > and -40.
> >
> > anybody has any Idea about what is this overshot? or what are these
> number?
> >
> > Here is the In-phase plot :
> >
> > Inline image 1
> >
> >
> > Thanks.
> >
> >
> >
> > _______________________________________________
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> > Discuss-gnuradio@gnu.org
> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> >
>
>
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