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allowances, where appropriate, for:
a) variation of relevant ground system parameters within the limits defined in Chapter 3, 3.1;
b) variation of aircraft environment;
c) measurement error; and
d) deterioration in service between maintenance periods.
The words “receiving equipment”, as used in this section, include the receiver itself, the antenna(s) and the necessary
interconnections in the aircraft.
2.2.1 General
2.2.1.1 In order to ensure consistent and reliable operation, the output characteristics of the receiver in respect of
course line (centring) and course width (deflection) should be maintained to a degree of accuracy appropriate to the
operational objective. Attention is directed towards the need to take into account the variable conditions that may affect such
accuracy.
2.2.1.2 Furthermore, in order to ensure that a constant course width is realized by all users of the ILS system, it is
necessary to standardize the overall gain of the localizer receiver. Similar considerations apply in the case of the glide path
receiver.
ATT C-15 23/11/06
Annex 10 — Aeronautical Communications Volume I
2.2.2 Localizer receiver audio gain adjustment
2.2.2.1 The audio gain of the receiver should be such that, with a radio frequency input of 1 000 microvolts modulated
20 per cent by a 90 Hz tone and 20 per cent by a 150 Hz tone, a zero indication is achieved and that, upon a simultaneous
increase in one component of 4.65 per cent (i.e. to 24.65 per cent) and a decrease in the other component of 4.65 per cent (i.e.
to 15.35 per cent), there is a proportional deflection of 3/5 of the full course width indication but not less than 9.5 mm along
its scale. This gain adjustment is to be made with the normal power supply voltage encountered under airborne operating
conditions.
2.2.3 Localizer receiving equipment centring tolerance
2.2.3.1 To obtain the operational objectives associated with ILS Performance Categories I, II and III and to ensure the
safe operation of aircraft within the obstacle clearance surfaces, the centring error of the receiving equipment, operating
within all the likely aircraft environmental conditions and receiving a zero signal (DDM) within the limits of the ground
equipment radio frequency modulation characteristics and identification tolerances, as specified in Chapter 3, 3.1.3, and with
an RF field strength of 90 microvolts per metre (minus 107 dBW/m2), should not exceed the following limits with a 68 per
cent probability:
Category I: 4.66 per cent of the full course width indication (0.0072 DDM)
Category II: 2.33 per cent of the full course width indication (0.0036 DDM)
Category III: 1.66 per cent of the full course width indication (0.00258 DDM)
Note.— These operational requirements are also to be met at larger field strengths up to the maximum field strength
likely to be encountered in operational service.
2.2.4 Localizer course displacement sensitivity (deflection) tolerance
2.2.4.1 When the receiver audio gain has been adjusted in accordance with 2.2.2, and with an increase in one
modulation tone of the audio frequency input signal of 4.65 per cent with respect to the nominal value (i.e. 24.65 per cent)
and a simultaneous decrease of the other component by 4.65 per cent with respect to the nominal value (i.e. 15.35 per cent),
the indicated deflection signal should not vary more than plus or minus 0.019 DDM from the nominal value at a signal
strength of 90 microvolts per metre (minus 107 dBW/m2) up to the maximum field strength likely to be encountered in
operational service.
Note.— See 2.2.5 in respect to signal levels.
2.2.5 Localizer receiving system minimum signal level sensitivity
2.2.5.1 The sensitivity of the localizer receiving equipment should be such that in a high percentage of cases, the
receiver indicates a usable signal and a substantially steady indication in the presence of the minimum field strength specified
in Chapter 3, 3.1.3.3.2 (40 microvolts per metre or minus 114 dBW/m2).
Note 1.— The maximum signal level likely to be encountered under 2.2.3 and 2.2.4 is 500 microvolts. Signal levels on
the order of 5 000 microvolts may be encountered in the near vicinity of the transmitter (e.g. when flying over the localizer
during a missed approach, or when the localizer is used for rollout or take-off guidance).
Note 2.— The two levels of sensitivity addressed in 2.2.4 and 2.2.5 ensure:
23/11/06 ATT C-16
Attachment C Annex 10 — Aeronautical Communications
a) a high quality output such as is necessary for approach purposes; and
b) an output of lesser quality adequate for operational usage of the facility in other parts of the coverage volume.
Note 3.— The proper operation of the localizer receiving system in the presence of the specified minimum field strength
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