User Guide

Series III Avionics
Pilot's Guide
Page 34
Operating the DFS-43A
1. Set the FUNCTION SELECTOR to ANT. Note that the external ADF pointer moves to 90° and stops.
2. If frequencies displayed are not the ones desired, rotate the FREQUENCY KNOBS until the desired
frequency is displayed on the bottom line of the display.
3. Press and release the FREQUENCY TRANSFER button. This exchanges the two displayed
frequencies. The desired frequency is now active.
NOTE:
An alternate tuning method is to press and hold the FREQUENCY TRANSFER button for
two seconds before releasing. This removes the standby frequency from the display and the
active frequency may be tuned by rotating FREQUENCY KNOBS. The system is ready for
immediate operation. If desired, press the FREQUENCY TRANSFER button for two
seconds again to restore standby frequency.
4. Adjust the VOLUME control to the desired audio level and identify the station represented by the
active frequency displayed.
5. Rotate the FUNCTION SELECTOR to ADF. Note that the external ADF pointers leave the 90°
parked position and move to indicate the direction to the active station.
6. Rotate the FUNCTION SELECTOR to BRG and read the magnetic bearing shown digitally on the
lower line of the display. Compare this reading with the other ADF displays to assure correct system
operation.
7. Return the FUNCTION SELECTOR to ADF for normal ADF operation.