OPTION 006 Avionics
Annex-A-14
To vary the 30 Hz tone AM depth or the VOR bearing select the
[REF]
key to produce the display
shown in Fig. A-14. The 30 Hz tone AM depth can be entered using the
[REF Depth]
key and
bearing information can be entered in degrees using the
[Bearing]
key followed by the bearing
data and the [enter] key. Conventions for bearing are not internationally consistent so a
[To/From]
key is provided to allow toggling between these two conventions. Operating this key
does change the bearing but not the value displayed. It also provides a convenient way of
providing a 180° bearing reversal.
Fig. A-14 REF selected
The AM depth of the 9960 Hz sub-carrier and the 30 Hz tone can be varied simultaneously by
pressing the
[Enable Coupling]
key which produces the display shown in Fig. A-15.
Fig. A-15 VOR made operation with "Coupling" enabled
When "coupling" is enabled, the 30 Hz AM depth is set to be equal to the 9960 Hz sub-carrier AM
depth setting as the sub-carrier depth is varied. Similarly, the sub-carrier depth is set to the 30 Hz
tone depth when the 30 Hz tone depth is varied. This mode of operation is disabled by pressing
the
[Disable Coupling]
key.