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cause interference to the use of the second, nevertheless the second may cause interference to the use of the first.
2.6.2 The figures listed in Table C-1 are based on providing an environment within which the airborne receivers can
operate correctly.
Table C-1. Required distance separations
Minimum separation between second facility
and the protection point of the first facility
km (NM)
Frequency
separation List A List B List C
Localizer Co-channel 148 (80) 148 (80) 148 (80)
50 kHz — 37 (20) 9 (5)
100 kHz 65 (35) 9 (5) 0
150 kHz — 0 0
200 kHz 11 (6) 0 0
Glide path Co-channel 93 (50) 93 (50) 93 (50)
150 kHz — 20 (11) 2 (1)
300 kHz 46 (25) 2 (1) 0
450 kHz — 0 0
600 kHz 9 (5) 0 0
List A refers to the use of localizer receivers designed for 200 kHz channel spacing coupled with glide path receivers
designed for 600 kHz channel spacing and applicable only in regions where the density of facilities is low.
List B refers to the use of localizer receivers designed for 100 kHz channel spacing coupled with glide path receivers
designed for 300 kHz channel spacing.
List C refers to the use of localizer receivers designed for 50 kHz channel spacing coupled with glide path receivers
designed for 150 kHz channel spacing.
Note 1.— The above figures are based on the assumption of protection points for the localizer at 46 km (25 NM)
distance and 1 900 m (6 250 ft) height and for the ILS glide path at 18.5 km (10 NM) distance and 760 m (2 500 ft) height.
Note 2.— States, in applying the separations shown in the table, have to recognize the necessity to site the ILS and
VOR facilities in a manner which will preclude the possibility of airborne receiver error due to overloading by high
unwanted signal levels when the aircraft is in the initial and final approach phases.
Note 3.— States, in applying the separations shown in the table, have to recognize the necessity to site the ILS glide
path facilities in a manner which will preclude the possibility of erroneous glide path indications due to reception of
adjacent channel signals when the desired signal ceases to radiate for any reason while the aircraft is in the final
approach phase.
23/11/06 ATT C-28
Attachment C Annex 10 — Aeronautical Communications
2.6.2.1 ILS localizer receivers
2.6.2.1.1 In order to protect receivers designed for 50 kHz channel spacing, minimum separations are chosen in order
to provide the following minimum signal ratios within the service volume:
a) the desired signal exceeds an undesired co-channel signal 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;
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.
2.6.2.1.2 In order to protect receivers designed for 100 kHz channel spacing, minimum separations are chosen in order
to provide the following minimum signal ratios within the service volume:
a) the desired signal exceeds an undesired co-channel signal by 20 dB or more;
b) an undesired signal, 50 kHz removed from the desired signal, exceeds the desired signal by up to 7 dB;
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.
2.6.2.2 ILS glide path receivers
2.6.2.2.1 In order to protect receivers designed for 150 kHz spacing, minimum separations are chosen in order to
provide the following minimum signal ratios within the service volume:
a) a desired signal exceeds an undesired co-channel signal by 20 dB or more;
b) an undesired glide path signal, 150 kHz removed from the desired signal, exceeds the desired signal by up to 20 dB;
c) an undesired glide path signal, 300 kHz or further removed from the desired signal, exceeds the desired signal by up
to 40 dB.
2.6.2.2.2 In order to protect receivers designed for 300 kHz spacing, minimum separations are chosen in order to
provide the following minimum signal ratios within the service volume:
a) a desired signal exceeds an undesired co-channel signal by 20 dB or more;
b) an undesired glide path signal, 150 kHz removed from the desired signal, does not exceed the desired signal (0 dB
signal ratio);
c) an undesired glide path signal, 300 kHz removed from the desired signal, exceeds the desired signal by up to 20 dB;
d) an undesired glide path signal, 450 kHz or further removed from the desired signal, exceeds the desired signal by up
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