Hi Marcus,
Thanks very much for the advice! I tried what you suggested ("stop",
"start", "autoscale", etc) but the time raster is stubbornly refusing to
work. I am beginning to think, like you said, that it may have something to
do with the QWT version installed. So I am trying to upgrade to version 6
but I am getting confused because once I installed version 6.1.4 of QWT it
saved to my 'Home' folder so GNU Radio is still detecting version 5. Do you
have any tips on how I could get it to use QWT 6? (I tried searching the web
for instructions/hints but have yet to turn up anything useful!) Thank you
so much!
-Ellie
-----Original Message-----
From: Marcus Müller [mailto:marcus.muel...@ettus.com]
Sent: Saturday, July 9, 2016 9:21 AM
To: discuss-gnuradio@gnu.org; orionnebul...@outlook.com
Subject: Re: [Discuss-gnuradio] Time Raster- Linux
Hi Ellie,
not a silly question at all! And, first of all: Welcome to the GNU Radio
community!
With 32kS/s, it's taking quite some time to build up something visible,
"pushing" out the solid yellow, but for me, this works (see screenshot
attached).
So, this actually does sound like a bug, but I can't really put my finger on
where things might go wrong. A couple of ideas to try, sorted by
desperation:
* middle mouse button on time raster canvas, "stop", middle mouse, "start"
* middle mouse button -> autoscale
* mmb -> save image (& inspect image)
If none of that helps, my best guess is that this might have something to do
with the QWT version used but as I've never saw that problem "in the
wild", that would surprise me a bit. Then again, the Time Raster Sink is not
the most popular (yet, one of the most helpful, I think) signal
visualization sink so maybe this simply never came up.
Actually, the warning that the visualization window nearly hides reads:
std::cerr << "Warning: QWT5 has been found which has serious performance
issues with raster plots."
and so, maybe the performance issue is so severe that you simply see
nothing.
Best regards,
Marcus
On 07.07.2016 03:26, Ellie White wrote:
>
> Hello!
>
>
>
> I am a new GNU Radio user and I have a question about the QT GUI Time
> Raster sink in GNU Radio version 3.7.8. I built a flowgraph (which is
> attached as a .grc file) with a source connected to both a QT GUI Time
> Sink and Time Raster. While the Time Sink displays the signal
> properly, the Time Raster is blank and shows no signal, as shown in
> the screen shot I included. I have tried to use the Time Raster tool
> on Ubuntu - version 15.10 (it is a virtual machine running in
> Windows), and cannot figure out why the time raster doesnt appear to
> display a signal. Am I doing something wrong, or is this a known
> issue? Thanks very much for your time and apologies if this is a
> silly question.
>
>
>
> -Ellie
>
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> Discuss-gnuradio@gnu.org
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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