Re: [Discuss-gnuradio] Spectrum Analysis with FFT plotting

[Sebastiaan Heunis]

Ujala

I don't know what you mean by the range of frequencies?  I'm guessing
you're just referring to the x-axis labels in Matlab.  That would
depend on your sampling frequency after the decimation and the number
of points that you use for the FFT.  Let's say your sampling frequency
is 16Msps and you're taking 1s of data for the FFT.  Your x-axis will
look as follows:

-16000000/2:1:(16000000/2)-1 or
-samp_freq/2:samp_freq/no_samples:(samp_freq/2)-1

If you get a peak in the middle of your data, then you have a DC
offset somewhere.

Sebastiaan