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the pitch of your voice. Press Shift -> Freq again and slowly increase the MOD frequency to
100Hz. Adjust the oscilloscope horizontal back to 250Hz.
8. The amplitude of the information, E.g. The volume of your voice, is conveyed by how far the
carrier deviates back and forth. Press Shift -> Level and change the deviation to 500 Hz. This
represents a larger amplitude. Small deviation conveys a small amplitude and a large deviation
conveys a large amplitude. See figure 12.
9. Press Shift -> FM to turn off the frequency modulation.
Figure 11: FM modulation
Figure 12: FM modulation with larger deviation.
Frequency Shift Keying (FSK)
Frequency shift keying is digital modulation. Lowering the carrier frequency by a set amount represents
a logic 0 and raising the carrier frequency by a set amount represents a logic 1. The data being
transmitted by the signal generator is just a stream of alternating 1’s and 0’s. If you want to control the
data being modulate please see the UTA EE Undergraduate staff.
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