OPERATION
3-1-21
Tone phase variability
For normal ILS operation the phase setting between the 90 Hz and 150 Hz tones is
automatically set to 0°. The
[90/150 Phase]
key can be used to adjust the phase relationship of
the two tones. Selecting the
[90/150 Phase]
key produces the display shown in Fig. 3-1-15.
Fig. 3-1-15 ILS variable phase sub-menu
Three phase relationships can be selected:
90 Hz sine/150 Hz sine
90 Hz cosine/150 Hz cosine
90 Hz sine/150 Hz cosine (
≡
90 Hz cosine/150 Hz sine)
Selecting
[DDM]
will return the instrument to normal ILS mode.
