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## [Discuss-gnuradio] usrp_spectrum_sense.py help needed to understand the

**From**: |
Rana Basheer |

**Subject**: |
[Discuss-gnuradio] usrp_spectrum_sense.py help needed to understand the output |

**Date**: |
Wed, 5 Mar 2008 07:26:19 +0100 |

I am trying to interpret the FFT output in the array m.data. Please let
me know if my interpretation of the data below is wrong or not
If I set the RFX2400 tuned to frequency 2.4G and the FFT size (fft_size)
is set at 256 and the decimation rate (decim_rate) is set at 8 then the
value at the array index is a square magnitude value of the signal at
frequency
freq(index) = 2.4G + (64e6*index)/(fft_size * decim_rate)
Am I wrong in my assumption?
--
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**[Discuss-gnuradio] usrp_spectrum_sense.py help needed to understand the output**,
*Rana Basheer* **<=**