Chapter 2 63
Making Measurements
Example 3: Modulation
3. Figure 2-10 contains Bessel functions for determining modulation.
(Table 2-1 and Table 2-2 on page 63 also contain modulation index
numbers for carrier nulls and first sideband nulls.)
Figure 2-10 Bessel Functions for Determining Modulation Index
Table 2-1 Carrier Nulls and Modulation Indexes
Order of Carrier Null Modulation Index
1 2.401
2 5.520
3 8.653
4 11.791
5 14.931
6 18.071
n (n > 6) 18.071 + π(n − 6)
Table 2-2 Sideband Nulls and Modulation Indexes
Order of First Sideband Null Modulation Index
1 3.83
2 7.02
3 10.17
4 13.32
5 16.47
6 19.62
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