784| Spectrum Analysis AOS-W 6.5.3.x| User Guide
was broadcasting a signal. These percentages are indicated by a range of colors between dark blue, which
represents a duty cycle of 0% percent, and red, which represents a duty cycle of 100%.
A spectrogram plot is a complex chart that can display a lot of information. If you are not familiar with these
types of charts, they may be difficult to interpret. The following illustrations can help explain how FFT power
data is rendered in a spectrogram format.
The example in Figure 133 shows how an FFT Power chart could appear if a single data measurement was
plotted as a simple line graph.
Figure 133 Simple Line Graph of FFT Power Data
Now, suppose that each channel’s FFT power level was also represented by a color that corresponded to that
specific FFT power level. In the example below, channel 12 has a FFT power level of -50 dBm, represented by
the color red. Channel 1 has a FFT power level of -85 dBm, represented by dark blue.
Figure 134 FFT Power Line Graph with Color
If the graph was then flattened so each channel’s FFT power for that single1-second sweep was represented
only by a color (and not by a value on the y-axis), the graph could then appear as follows:
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