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respect of specific altitudes. In application of the figures, regional meetings would only afford protection to the extent of the
operationally required altitude and distance and, by use of the formulae, criteria can be calculated for any distance or altitude.
3.4.2 The figures listed are calculated on the assumption that the effective adjacent channel rejection of the airborne
receiver is better than 60 dB down at the next assignable channel.
3.4.3 The calculations are based on the assumption that the protection against interference afforded to the wanted
signal from the unwanted signal is 20 dB, corresponding to a bearing error of less than 1 degree due to the unwanted signal.
3.4.4 It is recognized that, in the case of adjacent channel operation, there is a small region in the vicinity of a VOR
facility, in which interference may be caused to an aircraft using another VOR facility. However, the width of this region is
so small that the duration of the interference would be negligible and, in any case, it is probable that the aircraft would
change its usage from one facility to the other.
Table C-3. Values of geographical separation distances for co-channel operation
VOR facilities of
equal effective
radiated power
VOR facilities which differ in effective
radiated power by 6 dB
VOR facilities which differ in effective
radiated power by 12 dB
Minimum geographical
separation
between facilities
Minimum geographical separation
between facilities
Minimum geographical separation
between facilities
is 2D1 +
20
S
if D1 > D2
or 2D2 +
20
S
if D2 > D1
is 2D1 +
20 K
S
−
if D1 > D2 +
K
S
or 2D2 +
20 K
S
+
if D1 < D2 +
K
S
is 2D1 +
20 K
S
−
if D1 > D2 +
K
S
or 2D2 +
20 K
S
+
if D1 < D2 +
K
S
Altitude
m (ft)
S
dB/km (NM)
K
dB
20
S
km (NM)
K
dB
K
S
km (NM)
20 K
S
−
km (NM)
20 K
S
+
km (NM)
K
dB
K
S
km (NM)
20 K
S
−
km (NM)
20 K
S
+
km (NM)
1 2 3 4 5 6 7 8 9 10 11 12
1 200 (4 000) 0.32 (0.60) 0 61 (33) 6 19 (10) 43 (23) 80 (43) 12 37 (20) 24 (13) 98 (53)
3 000 (10 000) 0.23 (0.43) 0 87 (47) 6 26 (14) 61 (33) 113 (61) 12 52 (28) 35 (19) 137 (74)
4 500 (15 000) 0.18 (0.34) 0 109 (59) 6 33 (18) 76 (41) 143 (77) 12 67 (36) 44 (24) 174 (94)
6 000 (20 000) 0.15 (0.29) 0 128 (69) 6 39 (21) 89 (48) 167 (90) 12 78 (42) 52 (28) 206 (110)
7 500 (25 000) 0.13 (0.25) 0 148 (80) 6 44 (24) 104 (56) 193 (104) 12 89 (48) 59 (32) 237 (128)
9 000 (30 000) 0.12 (0.23) 0 161 (87) 6 48 (26) 113 (61) 209 (113) 12 96 (52) 65 (35) 258 (139)
12 000 (40 000) 0.10 (0.19) 0 195 (105) 6 59 (32) 135 (73) 254 (137) 12 119 (64) 78 (42) 311 (168)
18 000 (60 000) 0.09 (0.17) 0 219 (118) 6 65 (35) 154 (83) 284 (153) 12 130 (70) 87 (47) 348 (188)
Note.— S, K and the sign of K are defined in 3.4.5.
23/11/06 ATT C-46
Attachment C Annex 10 — Aeronautical Communications
3.4.5 The agreed formulae for calculating the geographical separations are as follows (nautical miles may be
substituted for kilometres):
A — minimum geographical separation (co-channel):
either 1
2 D 20 K km
S
−
+
whereD1 D2 K
S
> +
or 2
2 D 20 K km
S
+
+
where 1 2
D D K
S
< +
B — geographical separation (adjacent channel):
collocation case
40 K
S
−
<
non-collocated case
1
2D 40 Kk
S
+
> − m
where 1 2
D D K
S
> +
or 2
2D 40 Kk
S
−
− m
where 1 2
D D K
S
< +
C — geographical separation (adjacent channel)
(receivers designed for 100 kHz channel spacing in a 50 kHz channel spacing environment)
If receivers having an effective adjacent channel rejection of no better than 26 dB are used (e.g. a 100 kHz receiver used in a
50 kHz environment), a figure of 6 should be substituted for the figure of 40 in the above adjacent channel formulae. In this
instance, the geographical collocation formula should not be used as the protection afforded may be marginal.
This leads to the following formula:
1
2D 6 Kk
S
+
> + m
ATT C-47 23/11/06
Annex 10 — Aeronautical Communications Volume I
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