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

From: Cinaed Simson
Subject: Re: [Discuss-gnuradio] PSK Mod problem? or QT GUI problem?
Date: Thu, 1 Nov 2018 21:23:56 -0700
User-agent: Mozilla/5.0 (X11; Linux i686; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

Actually, PSK MOD has been depreciated.

Instead, you should probable use the Constellation Modulator and
Constellation Object.

Note, you did reproduced the constellation in the tutorial - but its
emphasis is on the hardware.

See the following tutorial instead


In any case, in the enclosed example, I replaced the PSK MOD with the
Constellation Modulator/Constellation Object for qpsk - and I inserted a
Rational Resampler in front of the USRP sink.

-- Cinaed

On 11/01/2018 07:26 AM, Mercado, Alejandra 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

Attachment: my-qpsk_tx_b.grc
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