Hi LD, you're right the QT GUI sink does not seem to care about changing FFT sizes. I remember the set_fft_size function being implemented, I think it's mainly a matter of having a callback defined for changes of the fft size parameter. As I'm not too familiar with that, my mileage when playing with the QT sinks may vary. Could you try adding <callback>set_frequency_range($fc, $bw)</callback> to gr-qtqui/grc/qtgui_freq_sink_x.xml where the other callbacks are defined and try if it works for you?
Greetings, Marcus On 06/04/2014 12:47 AM, LD Zhang wrote:
I am trying to use the uhd_fft or gnu-radio scope in a way that it can show a real-time spectrum but with adjustable resolution. The uhd_fft spectrum resolution appears to be fixed and not changeable. The gnu-radio scope block only puts out time series but not real-time spectrum. What is my way out of this situation? Thanks, LD _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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