Figure 2-12 A Frequency-Modulated Signal - Agilent Technologies 8560E User Manual

• Gradually change the modulation frequency (or change the
Figure 2-12 A Frequency-Modulated Signal
Chapter 2
amplitude of the modulation signal) and observe the changes in the
displayed nulls. Figure 2-12 illustrates a frequency-modulated
signal with a small modulation index (modulation index of about 0.2)
as it appears on a spectrum analyzer. Figure 2-13 on page 66 and
Figure 2-14 on page 66 illustrate larger modulation index values. In
the first figure the null is at the carrier. In the second figure the null
is at the first sideband.
Making Measurements
Example 3: Modulation
65