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is to occur independently of the orientation of the aircraft longitudinal axis in the horizontal plane when the aircraft is
exposed to roll angles of 20 degrees and pitch angles of 10 degrees.
2.2.6 Localizer course displacement linearity
2.2.6.1 The receiver output course displacement signal should be a substantially linear function of the DDM of the
receiver input signal. For any input over the range of plus or minus 0.155 DDM, and for any RF signal level likely to be
encountered in operational service, the displacement sensitivity should not depart from the nominal DDM/deflection ratio
defined in 2.2.2 by more than plus or minus 20 per cent. Also for an input signal of plus or minus 0.165 DDM or greater, the
output must be greater than full course displacement.
Note.— See 2.2.5 in respect to signal levels.
2.2.7 Localizer receiver bandwidth
2.2.7.1 The receiver bandwidth should be such as to provide for the reception of channels having the characteristics
defined in Chapter 3, 3.1.3.2.1 after taking suitable account of appropriate receiver tolerances.
2.2.8 Localizer receiver susceptibility to VOR and localizer signals
2.2.8.1 The receiver design should provide correct operation in the following environment:
a) the desired signal exceeds an undesired co-channel by 20 dB or more;
b) an undesired signal, 50 kHz removed from the desired signal, exceeds the desired signal by up to 34 dB. (During
bench testing of the receiver, in this first adjacent channel case, the undesired signal is varied over the frequency
range of the combined ground station (plus or minus 9 kHz) and receiver frequency tolerance.);
c) an undesired signal, 100 kHz removed from the desired signal, exceeds the desired signal by up to 46 dB;
d) an undesired signal, 150 kHz or further removed from the desired signal, exceeds the desired signal by up to 50 dB.
Note 1.— It is recognized that not all receivers currently meet requirement b); however, all future equipment shall be
designed to meet this requirement.
Note 2.— In some States, a smaller ground station tolerance is used.
2.2.9 Immunity performance of ILS localizer receiving systems to interference from VHF FM broadcast signals
2.2.9.1 With reference to Note 2 of 3.1.4.2, Chapter 3, the immunity performance defined there must be measured
against an agreed measure of degradation of the receiving system’s normal performance, and in the presence of, and under
standard conditions for the input wanted signal. This is necessary to ensure that the testing of receiving equipment on the
bench can be performed to a repeatable set of conditions and results and to facilitate their subsequent approval. Tests have
shown that FM interference signals may affect both course guidance and flag current, and their effects vary depending on the
ATT C-17 23/11/06
Annex 10 — Aeronautical Communications Volume I
DDM of the wanted signal which is applied. Additional information can be found in ITU Recommendation ITU-R IS.1140,
Test procedures for measuring receiver characteristics used for determining compatibility between the sound-broadcasting
service in the band of about 87–108 MHz and the aeronautical services in the band 108–118 MHz.
2.2.9.2 Commonly agreed methodology and formulae should be used to assess potential incompatibilities to receivers
meeting the general interference immunity criteria specified in Chapter 3, 3.1.4. The formulae provide clarification of
immunity interference performance of spurious emission (type A1) interference, out-of-band channel (type A2) interference,
two-signal and three-signal third order (type B1) interference, and overload/desensitization (type B2) interference. Additional
information can be found in ITU Recommendation ITU-R IS.1009-1, Compatibility between the sound-broadcasting service
in the band of about 87–108 MHz and the aeronautical services in the band 108–137 MHz.
2.2.9.3 The frequency planning criteria given in Recommendation ITU-R IS.1009-1 does not take account of the
potential for two-signal and three-signal fifth order (type B1) intermodulation products. Measurements have determined that
fifth order intermodulation products created in receiver by FM stations might degrade the performance of ILS receivers
conforming to specifications in Chapter 3, 3.1.4. Fifth order intermodulation products can occur without a third order
intermodulation product occurring on the same ILS frequency. In the planning of frequencies, and in the assessment of
protection from FM broadcast interference, consideration needs to be given to two-signal and three-signal fifth order
intermodulation products generated within ILS receivers by FM broadcast stations.
2.2.10 Glide path receiver audio gain adjustment
2.2.10.1 The audio gain of the receiver should be such that, with a radio frequency input of 600 microvolts modulated
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