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
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.
Babisstrv asking:
please explain
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