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 _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio