usrp_fft.py is one the examples (or utilities) which is prepared in gnuradio source code. this example python utility is in this path: <gnuradio source directory>/gr-utils/src/python/usrp_fft.py
this python example calculates the fft transform of the signal which is captured from the USRP (as source); and then, plots the spectrum (output of fft transform) via a GUI. one the options prepared on the GUI is "Peak Hold"; that can be selected by checking its checkbox. by checking the Peak Hold checkbox, a green diagram will be ploted on the GUI, that indicates the maximum values of the spectrum in every frequency. I made a project in grc that generates a python code like usrp_fft.py. but now i need to catch the Peak Hold Diagram values as a vector; to do sum calculations on these values. i tried to use some blocks prepared by grc, like "Operator -> FFT" or "Operator -> Log Power FFT", to calculate the fft spectrum of the USRP signal; but i dont know how to manipulate the output of these blocks and how to catch the Peak Values? your help will be appreciated thnx
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