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2.3.1 Modulation Compensator
The Modulation trim-potentiometer (see illustration A–2) compensates for slight variations in
deviation sensitivity with frequency. If you have a problem, R72 can be adjusted. From the
factory, it is set for 50% or midrange. Set the trim-pot dial according to the following graph:
Frequency of Operation (MHz)
These compensator settings are approximate. Each mark on the potentiometer represents
about 10% modulation compensation.
Modulation Compensator Pot
Appendix A
108
106
104
102
100
98
97.1
96
94
92
90
88
86
84
82.4
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80
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Illustration A-1 Modulation Compensator Settings
Illustration A-2 Modulation Compensator Pot
Modulation Compensation Pot Setting
0
10
15
25
35
40
45
55
60
70
75
80
80
80
70
65
55
30
0
FM5 User's Manual
2-7
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