QT GUI Sink: wrong frequency scale, fft size (next branch)

GNU Radio
1

If you just make any signal source and a QT GUI Sink, you’ll see that
the
frequency scale is wrong: a 32ksps signal will show a frequency range
from
-8kHz to +8kHz (instead of -16…16kHz).

Also, if you keep the default FFT size of 1024, the chooser widget shows
256, but in reality the FFT size is correct at 1024. If you select 1024,
nothing changes. Going back to 256, the spectrum becomes coarser.

BTW, I can zoom in/out in the FFT view using the scroll wheel, but I
can’t
move up/down. By default I just see the frequency peak of the
synthesized
sine wave, not the noise floor.

Greetings,
Hans.

2

Hans Van I. [email protected] writes:

If you just make any signal source and a QT GUI Sink, you’ll see that the
frequency scale is wrong: a 32ksps signal will show a frequency range from
-8kHz to +8kHz (instead of -16…16kHz).

Ah, I encountered this issue on Mac and reported earlier. I didn’t know
if it’s related to MacPorts or gnuradio next branch. Good to know that
this issue is confirmed.

Hans.
can’t move up/down. By default I just see the frequency peak of the
synthesized sine wave, not the noise floor.

Greetings,
Hans.

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3

Ok, could you add me as a contributor? I just added an account
(username:
hansvi).

4

On Sun, May 19, 2013 at 12:58 AM, Hans Van I.
[email protected] wrote:

move up/down. By default I just see the frequency peak of the synthesized
sine wave, not the noise floor.

Greetings,
Hans.

Hans,

Thanks for the reports of the issues. Please use the bug tracker so we
can properly keep track of these bugs to fix them:

http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#How-can-I-post-on-this-wiki-use-the-bug-tracker

Tom

5

On Sun, May 19, 2013 at 4:10 PM, Hans Van I.
[email protected] wrote:

Ok, could you add me as a contributor? I just added an account (username:
hansvi).

Ok, that’s done.

When you report it, also add version numbers of the libraries you’re
using (Qt and Qwt, specifically). I think that has to have something
to do with it.

Thanks,
Tom