User Guide
Series III Avionics
Pilot's Guide
Page 6
Operating the VCS-40A
1. Turn the SELECTOR to ON (fixed channel spacing) or to 25 or 8.33 (switchable channel spacing).
The last frequencies selected prior to System turnoff reappear in the display.
2. If these are not the desired frequencies, rotate the appropriate FREQUENCY KNOB until the desired
frequency is displayed as the standby frequency in the lower line of the display.
The large frequency knob increments (clockwise rotation) or decrements (counter-clockwise rotation)
the frequency being tuned by one megahertz for each detent.
The small frequency knob increments (clockwise rotation) or decrements (counter-clockwise rotation)
the frequency being tuned by 25 kHz or 8.33 kHz for each detent.
For 8.33 kHz channel spacing, the small frequency knob sequences through a list of both 25 kHz and
8.33 kHz channels (see table below).
Frequency (MHz) Channel Spacing (kHz) Channel Name
118.0000 25 118.000
118.0000 8.33 118.005
118.0083 8.33 118.010
118.0167 8.33 118.015
118.0250 25 118.025
118.0250 8.33 118.030
118.0333 8.33 118.035
118.0417 8.33 118.040
118.0500 25 118.050
118.0500 8.33 118.055
118.0583 8.33 118.060
118.0667 8.33 118.065
118.0750 25 118.075
118.0750 8.33 118.080
118.0833 8.33 118.085
118.0917 8.33 118.090
118.1000 25 118.100
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136.9750 25 136.975
136.9750 8.33 136.980
136.9833 8.33 136.985
136.9917 8.33 136.990