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facilities do not exceed the following levels:
9 960 Hz 0 dB reference
2nd harmonic –20 dB
4th harmon –40 dB
th eparation form ould be a
by 20 in the formula at B — non-collocated case;
b) where it is necessary to protect receivers designed for 100 kHz channel spacing, the co-channel formula at A — cochannel
case, should be applied for the range of alt
3.4.9 When DME/N facilities and VOR facilities are intended to operate in association with each other, as outlined in
3, 3.5.3.3.5, and have a common service volume, both the co-channel and adjacent channe
dd
nce between VOR and DME does not exceed 600 m (2 000 ft). However, if DME/W facilities are employed, the first
adjacent channel minimum separation for the DME/W facilities should be equal to the co-channel separation specified for the
VOR. The second adjacent channel minimum separation for DME/W facilities should equal the first adjacent channel
separation specified for VOR. A potential interference situation may also occur with the implementation of DME “Y”
channels since interference between two DME ground stations spaced 63 MHz apart could occur when transmitting and
receiving on the same frequency (e.g. transmissions from channel 17 Y could interfere with reception on channels 80 X and
80 Y). To obviate any ground receiver desensitization due to this interference, a minimum ground separation distance of
18.5 km (10 NM) between facilities is necessary.
3.5 Criteria for ge
a) that the localizer receiver characteristic is as shown in 2.6.2, and the VOR receiver characteristic as shown in 3.4.2;
an altitude of 1 900 m (6 250 ft).
Not .— With the advent of highly directional ILS localizer antenna arrays, the most critical protection point will not be
e extended runway centre line. D
p
examined during the frequency assignment process.
3.5.2 Although international VOR and ILS facilities will not appear on the same frequency, it may occur that an
international VOR facility may share temporarily th
ATT C-49 23/11/06
Annex 10 — Aeronautical Communications Volume I
facility. For this reason, guidance is given as to the geographical separation required not only for a VOR and an ILS facility
pa
eparately for each facility where relevant.
a) Protection of the ILS system requires that a VOR having an ERP of 17 dBW (50 W) be at least 148 km (80 NM)
ion point.
ude of 3 000 m (10 000 ft), protection of the VOR system requires that the ILS be at
least 148 km (80 NM) from the VOR.
c)
3
the facili
the ILS system requires that a VOR having an ERP of 17 dBW (50 W) be at least
9.3 km (5 NM) from the ILS protection point;
b)
es that a VOR having an ERP of 17 dBW (50 W) be at least 79.6 km
(43 NM) from the ILS protection point.
3.5.
recognit stitution of an approximate method of calculating separation, and the
pplication of the figures will only be correct within the limitations set by those assumptions. If more precise determination
s
ch circumstances, to avoid disturbance of the ILS receiver output due to possible cross modulation
ffects, suitable frequency separation between the ILS and VOR channel frequencies should be used. The frequency
pa
3.6 Receiving function
3.6.1 Sensitivity. After due allowance has been made for aircraft feeder mismatch, attenuation loss and antenna polar
diagram variation, the sensitivity of the receiving to provide on a high percentage of occasions the
ccuracy of output specified in 3.6.2, with a signal having a field strength of 90 microvolts per metre or minus 107 dBW/m2.
1) the tolerance of the modulation components of the ground VOR facility as defined in Chapter 3, 3.3.5;
se rated by 50 kHz or 100 kHz, but also for co-channel usage.
3.5.3 Because of the differing characteristics of use of the two equipments, the criteria for minimum geographical
separation of VOR/ILS to avoid harmful interference are stated s
3.5.3.1 Co-channel case
from the ILS protect
b) On the assumption that a VOR having an ERP of 17 dBW (50 W) is to be protected to a service distance of
46.25 km (25 NM) and an altit
If protection of the VOR is required to, say, 92.5 km (50 NM) and 6 000 m (20 000 ft), the ILS is to be at least
250 km (135 NM) from the VOR.
3.5. .2 Adjacent channel case. Protection of the VOR system is effectively obtained without geographical separation of
ties. However, in the case of:
a) a localizer receiver designed for 100 kHz channel spacing and used in an area where navaid assignments are spaced
at 100 kHz, the protection of
a localizer receiver designed for 100 kHz channel spacing and used in an area where assignments are spaced at
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