Re: [Discuss-gnuradio] PSK Mod problem? or QT GUI problem?

[CEL]

As indicated by Dan, what you observe is the transmit side pulse
shaping; the PSK Mod block incorporates both the constellation mapper
as well as pulse shaping.

But, by the way, we've removed that PSK Mod block, I think, from the
upcoming release; seems our tutorials haven't caught up so far. So,
follow Cinaed's advice from his reply to your original email :)

Best regards,
Marcus

On Fri, 2018-11-02 at 08:41 -0400, Mercado, Alejandra wrote:
> Dear Dan,
> 
> Thanks for the response, but I am not including a receiver in this GRC. I was 
> just creating a QPSK and looking at the constellation. When you use the 
> Chunks to Symbols" block and plot it, it comes out cleanly, but when you use 
> the PSK Mod there are samples in the origin.
> 
> Just wondering which is the cause.
> 
> On Thu, Nov 1, 2018 at 9:56 PM Dan CaJacob <address@hidden> wrote:
> > I think this happens when you don't have matched filters?
> > 
> > On Thu, Nov 1, 2018 at 10:45 AM Mercado, Alejandra <address@hidden> wrote:
> > > Dear GnuRadio folks,
> > > 
> > > I have a questions about the "PSK Mod" block of GnuRadio. I am following 
> > > the tutorial found here: 
> > > https://wiki.gnuradio.org/index.php/Guided_Tutorial_Hardware_Considerations
> > > (the grc is attached)
> > > 
> > > I followed the instructions to see the output of PSK Mod for 4 
> > > constellation points. To my surprise, the constellation graph shows 
> > > points that are ambiguously between quadrants (see the screenshot).
> > > 
> > > What causes this? Is it the PSK Mod block that creates output points that 
> > > do not correspond to one of the four points? Or is it the QT GUI that is 
> > > not displaying the output correctly? Or both?
> > > 
> > > Thanks and regards
> > > _______________________________________________
> > > Discuss-gnuradio mailing list
> > > address@hidden
> > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> > 
> > -- 
> > Very Respectfully,
> > 
> > Dan CaJacob
> 
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