Re: [Discuss-gnuradio] Time Raster- Linux

[Marcus Müller]

Nope, same problem under Ubuntu 16.04LTS



On 10.07.2016 16:20, Marcus Müller wrote:
> Hi Ellie,
>
> you'd have to recompile GNU Radio to use a different version of QWT – I
> don't know how you've installed your current version, so this might be
> more or less complicated.
>
> I'll try to build a quick Ubuntu 16.04 container with GNU Radio from the
> Ubuntu package sources to see whether things work better there (because
> in that case, upgrading from 15.10 to 16.04 is what I'd recommend –
> especially since 16.04 is a LTS release)
>
>
> Best regards,
> Marcus
>
> On 10.07.2016 14:54, Ellie White wrote:
>> 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:address@hidden 
>> Sent: Saturday, July 9, 2016 9:21 AM
>> To: address@hidden; address@hidden
>> 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 doesn’t 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
>>>
>>>
>>>
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