[Discuss-gnuradio] usrp_spectrum_sense.py

Hi,

In my experimentation, the measured power depends on fft_size and
dwell_delay in usrp_spectrum_sense.py while measuring noise power, the
larger those values results in higher measured power even if it is
normalized based on the fft_size like this.

20*math.log10(math.sqrt(bin)/tb.fft_size)
- 20*math.log10(tb.fft_size)
-10*math.log(tb.power/tb.fft_size/tb.fft_size)

I wonder it is normal operation.

Thanks,
Kyungtae

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