User Guide

Series III Avionics
Pilot's Guide
Page 4
CD-402B Controls (All)
Frequency Knobs
The outer knob tunes the transmit/receive frequency
in whole MHz steps (118, 119, 120, etc.). The inner
knob tunes in 25 or 8.33 kHz steps (refer to the table
on page 6).
Volume Control (Optional)
- Inner knob controls
the receiver audio volume.
Frequency Transfer Button
Press and release to exchange active and standby
frequencies. Press and hold 2 seconds to remove
the standby frequency so that the active frequency
can be changed. Press and hold 2 seconds again to
restore the standby frequency.
Press and hold for 7 seconds or longer to set the
active frequency to 121.50 MHz.