Hi All, I am sampling a 70MHz IF signal at 86 MHz (aliasing it at 16 MHz). I need to display the samples in time & freq domain. The time-domain chart is working and displays the samples similar to an oscilloscope. But the freq-domain chart does not look right. I basically FFT'd the samples and plotted the samples up to 43 MHz (sample_rate/2). Is performing FFT on data is all I need to do to build a spectrum analyzer type chart ? Any help and/or comment to point me in the right direction is appreciated. Thanx.