Re: [Discuss-gnuradio] QT GUI Sink: wrong frequency scale, fft size (next branch)

[Albert Chun-Chieh Huang]

Hans Van Ingelgom <address@hidden> 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.

>
> 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.
> 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.
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

-- 
Albert Chun-Chieh Huang(黃俊傑)
Blog: Random Notes, http://alberthuang314.blogspot.com/