User guide

AirMagnet Spectrum XT User Guide
Chapter 6: Analyzing Spectrum Data 71
The text message at the bottom of the Spectrum Density Configuration dialog box changes with the
parameter you select. It provides a brief description of the parameter being selected.
Spectrogram Graph
The Spectrogram graph provides another way to present the same data as shown in the Real-
Time FFT graph. It allows you to visualize the changes in the spectrum over a period of time
and to easily identify any shift in frequency use and the duration of such shifts. The X-axis
shows the frequency range covered by the selected radio band. The Y-axis shows in real time the
number of sweeps the spectrum adapter scans the RF spectrum, which ranges from 0 to 100. See Figure
6-8.
Figure 6-9: Spectrogram graph
Each time the adapter scans the RF spectrum makes one sweep cycle, which is represented by
a horizontal (colored) line across the spectrogram plot. The spectrogram scrolls dynamically
upward as the application scans the spectrum. New data appear at the bottom of the graph
while old data are constantly pushed to the top. Since the plot can only display up to 100
sweep cycles, anything beyond 100 will be discarded.
The sweep cycle values are mapped to a range of colors which corresponds to color range
shown in the color legend in the upper-right corner of the graph. Blue represents the
Minimum power values while red represents the Maximum power values.
Configuring Spectrogram Graph Parameters
You can set or change the parameters of the Spectrogram graph using the Chart Configuration
button.