0

I am working on understanding modulation and demodulation when I ran into a rather weird problem with my graphs. It seems the spectrum of my modulated signal is shown in time while my signal was shown in frequency. Is there something I did wrong in the setup? Thanks!

enter image description here enter image description here

FDinoff
  • 30,689
  • 5
  • 75
  • 96
user1726820
  • 1
  • 3

1 Answers1

0

It looks like the Spectrum of Modulated Signal is in the frequency domain, but the X-Axis is just the number of non-redundant points in FFT and not scaled to a normalized frequency.

Check the Spectral Measurements VI that is attached to Spectrum of Modulated Signal and adjust the settings to get it to a normalized frequency. You can change the X-Axis label to read Frequency instead of Time, but that is cosmetic (and proper).

Austin
  • 1,018
  • 9
  • 20
  • To change the label of your X axis, right click on the graph(or the chart) and select "Properties". Then go to "Scales" tab and change the X label. – Kamran Bigdely Nov 11 '13 at 17:01