Re: [Discuss-gnuradio] FFT Plot and Benchmark

[Eric Blossom]

On Thu, Jul 09, 2009 at 01:44:36PM +0600, ali siddiqi wrote:
> Hi all,
> 
> I have edited benchmark_tx.py to shift between 3 different frequencies,
> depending upon which one is free after sensing the apectrum. i have made a
> separate program which senses the spectrum and it is called in benchmark_tx.
> 
> Thus the system switches between transmit (benchmark_tx) and receive
> (sensing) mode on a regular basis.
> 
> This works fine.
> 
> The problem arises when i want to show on the situation of the spectrum on a
> FFT Plot. I ran the GRC flowgraph (USRP Source-->FFT Sink) in parallel with
> the above mentioned programs. But it doesnt work.
> 
> Can someone help me in finding out how to add FFT Plot in the above
> programs.

If you look at gr-wxgui/src/python/fftsink_gl.py or fftsink_nongl.py
you'll see that there is a complete standalone example at the bottom.

You basically just instantiate a fft_sink_c or _f.

Eric