Re: FFT size in QT GUI Freq.Sink

[Volker Schroer]

You have to set the spectrum width to half in the gui frequency sink block.


The fftsize should be 32 256 512 1024 2048 4096 .
In the example you mentioned, the fftsize is set to 2048.

-- Volker

I was learning about the sampling rate by looking into the
tutorial provided in the GNURadio wiki
URL: https://wiki.gnuradio.org/index.php/Sample_Rate_Tutorial


When I was trying to replicate the flowgraph in my 3.8.2.0 version of
GNURadio. I got an FFT size error message:

     return _qtgui_swig.freq_sink_f_make(fftsize, wintype, fc, bw, name,
nconnections, parent)
RuntimeError: freq_sink: FFT size must be > 16 and < 16384.

Then I tried to increase the FFT size to 17 and then the flowgraph was
executed but the flowgraph was not the same as shown in the example.

Attaching the flowgraph for the reference

My question is whether I have built the flowgraph in the wrong manner or
is it with the GNURadio 3.8 issue??

Regards
Ярослав

Re: FFT size in QT GUI Freq.Sink

[Volker Schroer]

The fftsize should be 32 256 512 1024 2048 4096 .
In the example you mentioned, the fftsize is set to 2048.

-- Volker

I was learning about the sampling rate by looking into the
tutorial provided in the GNURadio wiki
URL: https://wiki.gnuradio.org/index.php/Sample_Rate_Tutorial


When I was trying to replicate the flowgraph in my 3.8.2.0 version of
GNURadio. I got an FFT size error message:

     return _qtgui_swig.freq_sink_f_make(fftsize, wintype, fc, bw, name,
nconnections, parent)
RuntimeError: freq_sink: FFT size must be > 16 and < 16384.

Then I tried to increase the FFT size to 17 and then the flowgraph was
executed but the flowgraph was not the same as shown in the example.

Attaching the flowgraph for the reference

My question is whether I have built the flowgraph in the wrong manner or
is it with the GNURadio 3.8 issue??

Regards
Ярослав

Re: FFT size in QT GUI Freq.Sink

[Ron Economos]

The FFT size is 2048.

Ron

On 12/31/21 2:12 AM, peacockmango lotus wrote:
I was learning about the sampling rate by looking into the 
tutorial provided in the GNURadio wiki
URL: https://wiki.gnuradio.org/index.php/Sample_Rate_Tutorial 



When I was trying to replicate the flowgraph in my 3.8.2.0 version of 
GNURadio. I got an FFT size error message:


    return _qtgui_swig.freq_sink_f_make(fftsize, wintype, fc, bw, 
name, nconnections, parent)

RuntimeError: freq_sink: FFT size must be > 16 and < 16384.

Then I tried to increase the FFT size to 17 and then the flowgraph was 
executed but the flowgraph was not the same as shown in the example.


Attaching the flowgraph for the reference

My question is whether I have built the flowgraph in the wrong manner 
or is it with the GNURadio 3.8 issue??


Regards
Ярослав

FFT size in QT GUI Freq.Sink

[peacockmango lotus]

I was learning about the sampling rate by looking into the
tutorial provided in the GNURadio wiki
URL: https://wiki.gnuradio.org/index.php/Sample_Rate_Tutorial

When I was trying to replicate the flowgraph in my 3.8.2.0 version of
GNURadio. I got an FFT size error message:

return _qtgui_swig.freq_sink_f_make(fftsize, wintype, fc, bw, name,
nconnections, parent)
RuntimeError: freq_sink: FFT size must be > 16 and < 16384.

Then I tried to increase the FFT size to 17 and then the flowgraph was
executed but the flowgraph was not the same as shown in the example.

Attaching the flowgraph for the reference

My question is whether I have built the flowgraph in the wrong manner or is
it with the GNURadio 3.8 issue??

Regards
Ярослав