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which exceed the following:
Chapter 3 Annex 10 — Aeronautical Communications
3-7 23/11/06
Amplitude (DDM)
Zone (95% probability)
Outer limit of coverage to
ILS Point “A” 0.031
ILS Point “A” to 0.031 at ILS Point “A”
ILS Point “B” decreasing at a linear rate to
0.005 at ILS Point “B”
ILS Point “B” to the
ILS reference datum 0.005
and, for Category III only:
ILS reference datum to
ILS Point “D” 0.005
ILS Point “D” to 0.005 at ILS Point “D”
ILS Point “E” increasing at a linear rate to
0.010 at ILS Point “E”
Note 1.— The amplitudes referred to in 3.1.3.4.1 and 3.1.3.4.2 are the DDMs due to bends as realized on the mean
course line, when correctly adjusted.
Note 2.— Guidance material relevant to the localizer course structure is given in 2.1.4, 2.1.6 and 2.1.7 of Attachment C.
3.1.3.5 Carrier modulation
3.1.3.5.1 The nominal depth of modulation of the radio frequency carrier due to each of the 90 Hz and 150 Hz tones
shall be 20 per cent along the course line.
3.1.3.5.2 The depth of modulation of the radio frequency carrier due to each of the 90 Hz and 150 Hz tones shall be
within the limits of 18 and 22 per cent.
3.1.3.5.3 The following tolerances shall be applied to the frequencies of the modulating tones:
a) the modulating tones shall be 90 Hz and 150 Hz within plus or minus 2.5 per cent;
b) the modulating tones shall be 90 Hz and 150 Hz within plus or minus 1.5 per cent for Facility Performance
Category II installations;
c) the modulating tones shall be 90 Hz and 150 Hz within plus or minus 1 per cent for Facility Performance
Category III installations;
d) the total harmonic content of the 90 Hz tone shall not exceed 10 per cent; additionally, for Facility Performance
Category III localizers, the second harmonic of the 90 Hz tone shall not exceed 5 per cent;
e) the total harmonic content of the 150 Hz tone shall not exceed 10 per cent.
3.1.3.5.3.1 Recommendation.— For Facility Performance Category I — ILS, the modulating tones should be 90 Hz and
150 Hz within plus or minus 1.5 per cent where practicable.
Annex 10 — Aeronautical Communications Volume I
23/11/06 3-8
3.1.3.5.3.2 For Facility Performance Category III localizers, the depth of amplitude modulation of the radio frequency
carrier at the power supply frequency or its harmonics, or by other unwanted components, shall not exceed 0.5 per cent.
Harmonics of the supply, or other unwanted noise components that may intermodulate with the 90 Hz and 150 Hz navigation
tones or their harmonics to produce fluctuations in the course line, shall not exceed 0.05 per cent modulation depth of the
radio frequency carrier.
3.1.3.5.3.3 The modulation tones shall be phase-locked so that within the half course sector, the demodulated 90 Hz
and 150 Hz wave forms pass through zero in the same direction within:
a) for Facility Performance Categories I and II localizers: 20 degrees; and
b) for Facility Performance Category III localizers: 10 degrees,
of phase relative to the 150 Hz component, every half cycle of the combined 90 Hz and 150 Hz wave form.
Note 1.— The definition of phase relationship in this manner is not intended to imply a requirement to measure the phase
within the half course sector.
Note 2.— Guidance material relative to such measurement is given at Figure C-6 of Attachment C.
3.1.3.5.3.4 With two-frequency localizer systems, 3.1.3.5.3.3 shall apply to each carrier. In addition, the 90 Hz
modulating tone of one carrier shall be phase-locked to the 90 Hz modulating tone of the other carrier so that the
demodulated wave forms pass through zero in the same direction within:
a) for Categories I and II localizers: 20 degrees; and
b) for Category III localizers: 10 degrees,
of phase relative to 90 Hz. Similarly, the 150 Hz tones of the two carriers shall be phase-locked so that the demodulated wave
forms pass through zero in the same direction within:
1) for Categories I and II localizers: 20 degrees; and
2) for Category III localizers: 10 degrees,
of phase relative to 150 Hz.
3.1.3.5.3.5 Alternative two-frequency localizer systems that employ audio phasing different from the normal in-phase
conditions described in 3.1.3.5.3.4 shall be permitted. In this alternative system, the 90 Hz to 90 Hz phasing and the 150 Hz
to 150 Hz phasing shall be adjusted to their nominal values to within limits equivalent to those stated in 3.1.3.5.3.4.
Note.— This is to ensure correct airborne receiver operation in the region away from the course line where the two
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