Modulation Compensator - Crown FM500 User Manual

3. Use small flat blade screwdriver or another suitable device to rotate the
switches to the desired setting. (The selected number will appear directly
above the white indicator dot on each switch.) See examples of selected
frequencies in the illustration below.
Illustration 2–7 Two Sample Frequency Selections
4. If you have the receiver option, proceed to section 2.5 to set the incoming
frequency. Otherwise, replace the top cover.
2.4.1

Modulation Compensator

The Modulation trim-potentiometer (see illustration 2–8) compensates for slight
variations in deviation sensitivity with frequency. Set the trim-pot dial according
to the following graph:
90
80
70
60
50
40
30
20
10
0
75 80 85
Illustration 2–8 Modulation Compensator Settings
These compensator settings are approximate. Each mark on the potentiometer
represents about 1.8% modulation compensation. For more exact settings, refer to
section 5.2.2.
2–6
Modulation Compensation Pot Setting
90 95
Frequency (MHz)
= 88.1 MHz
= 107.9 MHz
100 105
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