Page 62 - Complete Wireless Design

Modulation

Modulation 61

TABLE 2.1 Number and Amplitudes of Sidebands
Pairs of sidebands to the last significant sideband
Modulation index Carrier 1st 2d 3d 4th 5th 6th 7th 8th
0.00 1.00
0.25 0.98 0.12
0.5 0.94 0.24 0.03
1.0 0.77 0.44 0.11 0.02
1.5 0.51 0.56 0.23 0.06 0.01
2.0 0.22 0.58 0.35 0.13 0.03
2.5 0.05 0.50 0.45 0.22 0.07 0.02
3.0 0.26 0.34 0.49 0.31 0.13 0.04 0.01
4.0 0.40 0.07 0.36 0.43 0.28 0.13 0.05 0.02
5.0 0.18 0.33 0.05 0.36 0.39 0.26 0.13 0.05 0.02

Figure 2.14 An FM signal with a
modulation index of 0 (an
unmodulated FM carrier).

Figure 2.15 An FM signal with a
modulation index of 1.5,
showing multiple sidebands.

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