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
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