The deflection of the ADI command bars when flying a localiser approach is proportional to
- the difference between the amplitudes on the two modulations.
- the difference in amplitude of the two r.f. carriers.
- the sum of the amplitude of the two modulations.
Explanation from PART66Online
A localiser radiates two overlapping lobes modulated at 90 Hz and 150 Hz on the same carrier; on the centreline the modulation depths are equal and off-centre one dominates. The ADI command bar deflection is proportional to this difference in modulation depth (the difference in depth of modulation), not to the carrier amplitudes or their sum.
B
Babisstrv asked · 19 May 2025
please explain
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