User Guide

Series III Avionics
Pilot's Guide
Page 3
CD-402B Controls (Switchable Channel Spacing)
Off/On Channel Spacing Selector and TEST
Pushbutton
OFF
- Deactivates the VCS-40A System. Records
the last frequencies displayed in the system's
non-volatile memory.
25
- Activates the VCS-40A System. Selects 25 kHz
channel spacing. The last frequencies displayed
reappear on the display.
8.33
- Selects 8.33 kHz channel spacing. The last
frequencies displayed reappear on the display.
TEST Pushbutton
Disables the squelch circuits to allow audible
verification of receiver operation.
CD-402B Controls (Fixed Channel Spacing)
Off/On/Test Function Selector
OFF
- Deactivates the VCS-40A System. Records
the last frequencies displayed in the system's
non-volatile memory.
ON
- Activates the VCS-40A System. The last
frequencies displayed reappear on the display.
TST
- Disables the squelch circuits to allow audible
verification of receiver operation.