QT GUI Sink: Waterfall much faster than standalone waterfall and time domain display crashes

GNU Radio
1

Hi,

so I got gnuradio basically running and started to experiment. 2 things,
I noticed:

1.) The waterfall display in the QT GUI sink seems to be about twice as
fast as the standalone QT GUI Waterfall sink. That’s nothing bad but I’d
be curious where this come from.

2.) When I choose the Time Domain Display tab in the QT GUI sink, the
window just closes. Nothing on the console, like error messages, etc…
Just puff gone… Is there a know bug with that?

-S

2

On Wed, Dec 04, 2013 at 01:18:56PM +0200, Stefan Gofferje wrote:

so I got gnuradio basically running and started to experiment. 2 things,
I noticed:

1.) The waterfall display in the QT GUI sink seems to be about twice as
fast as the standalone QT GUI Waterfall sink. That’s nothing bad but I’d
be curious where this come from.

2.) When I choose the Time Domain Display tab in the QT GUI sink, the
window just closes. Nothing on the console, like error messages, etc…
Just puff gone… Is there a know bug with that?

Have you tried calling the .py-file generated by GRC on the command
line? I’ve had some problems with segfaults caused by QT not being
displayed inside GNU Radio.

MB

–
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

Dipl.-Ing. Martin B.
Research Associate

Kaiserstraße 12
Building 05.01
76131 Karlsruhe

Phone: +49 721 608-43790
Fax: +49 721 608-46071
www.cel.kit.edu

KIT – University of the State of Baden-Württemberg and
National Laboratory of the Helmholtz Association

3

On 12/04/2013 02:06 PM, Martin B. (CEL) wrote:

2.) When I choose the Time Domain Display tab in the QT GUI sink, the
window just closes. Nothing on the console, like error messages, etc…
Just puff gone… Is there a know bug with that?

Have you tried calling the .py-file generated by GRC on the command
line? I’ve had some problems with segfaults caused by QT not being
displayed inside GNU Radio.

Now I have. Also exits but this time I get an error message, saying
“Floating point exception”.

-S

4

On Wed, Dec 4, 2013 at 6:18 AM, Stefan Gofferje
[email protected] wrote:

Hi,

so I got gnuradio basically running and started to experiment. 2 things,
I noticed:

1.) The waterfall display in the QT GUI sink seems to be about twice as
fast as the standalone QT GUI Waterfall sink. That’s nothing bad but I’d
be curious where this come from.

You can change the rate by adjusting the Update Period in the
waterfall’s properties.

2.) When I choose the Time Domain Display tab in the QT GUI sink, the
window just closes. Nothing on the console, like error messages, etc…
Just puff gone… Is there a know bug with that?

-S

When reporting errors like this, please also provide the version of
GNU Radio you are using. Most likely, you are on 3.7.2. This sounds
like buy #615, which is fixed in the latest 3.7.2.1 bug release.

Tom

5

On 12/04/2013 04:35 PM, Tom R. wrote:

1.) The waterfall display in the QT GUI sink seems to be about twice as
fast as the standalone QT GUI Waterfall sink. That’s nothing bad but I’d
be curious where this come from.

You can change the rate by adjusting the Update Period in the
waterfall’s properties.

Sorry, with the same rate configured, of course :).

When reporting errors like this, please also provide the version of
GNU Radio you are using. Most likely, you are on 3.7.2. This sounds
like buy #615, which is fixed in the latest 3.7.2.1 bug release.

My mistake, sorry. According to the package info it is 3.7.2-1.1 but
gnuradio-companion --version says 3.7.2. Hard to tell, what’s the actual
version. I use the official Opensuse Ham radio repo.

-S