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123.075 - 123.125 MHz inclusive and 136.500 -
136.975 MHz inclusive are not available for assignment to
channels of less than 25 kHz width.
Note 2.- Services that continue operation using 25 kHz
assignments will be protected in regions implementing
8.33 kHz channel spacing.
4.2 Utilization in the band
108 - 117.975 MHz
4.2.1 The block allotment of the frequency band 108 -
117.975 MHz shall be as follows:
- Band 108 - 11 1.975 MHz:
a) ILS in accordance with 4.2.2 and Annex 10, Volume I,
3.1.3;
b) VOR provided that:
1) no harmful adjacent channel interference is caused
to n s ;
2) only frequencies ending in either even tenths or even
tenths plus a twentieth of a megahertz are used.
c) GNSS ground-based augmentation system (GBAS)
in accordance with Annex 10, Volume I, 3.7.3.5,
provided that no harmful interference is caused to
ILS and VOR.
Note.-- ILS/GBAS geographical separation criteria
and geographical separation criteria for GBAS and VHF
Annex 10 - Aeronautical Telecommunications Volume V
communication services operating in the 118 - 137 MHz
band are under development. Until these criteria are
defined and included in the SARPs, it is intended that
frequencies in the band 112.050 - I 1 7.900 MHz will be
used for GBAS assignments.
- Band 11 1.975 - 11 7.975 MHz:
a) VOR;
b) GNSS ground-based augmentation system (GBAS) in
accordance with Annex 10, Volume I, 3.7.3.5, provided
that no harmful interference is caused to VOR.
Note 1.- Guidance material relating to the distance
separation required to prevent harmful interference between
ILS and VOR when using the band 108- 111.975 MHz is
found in Section 3 of Attachment C to Annex 10, Volume I.
Note 2.- Guidance material relating to the distance
separation required to prevent harmful interference between
VOR and GBAS when using the band 112.05 0-1 17.900 MHz is
found in Section 7.2.1 of Attachment D to Annex 10, Volume I.
4.2.2 For regional assignment planning, the frequencies
for ILS facilities shall be selected in the following order:
a) localizer channels ending in odd tenths of a megahertz
and their associated glide path channels;
b) localizer channels ending in odd tenths plus a twentieth
e) frequencies ending in even tenths plus a twentieth of a
megahertz in the band 108 - 1 1 1.975 MHz except as
provided in 4.2.3.1.
4.2.3.1 Frequencies for VOR facilities ending in even
tenths plus a twentieth of a megahertz in the band 108 -
11 1.975 MHz and all frequencies ending in 50 kHz in the band
11 1.975 - 117.975 MHz shall be permitted to be utilized on
the basis of a regional agreement when they have become
applicable in accordance with the following:
a) in the band 11 1.975 - 117.975 MHz for restricted
use;
b) for general use in the band 11 1.975 - 117.975 MHz at
a date fixed by the Council but at least one year after the
approval of the regional agreement concerned;
c) for general use in the band 108 - 1 11.975 MHz at a date
fixed by the Council but giving a period of two years or
more after the approval of the regional agreement
concerned.
Note.- "Restricted use", where mentioned in 4.2.2.1 a)
and 4.2.3.1 a), is intended to refer to the limited use of the
frequencies by only suitably equipped aircraft and in such a
manner that:
a) the performance of ILS or VOR equipment not capable
of operating on these frequencies will be protected from
harmful interference;
of a megahertz and theiiassociated glide path channels.
b) a general requirement for the carriage of ILS or VOR
4.2.2.1 ILS channels identified by localizer frequencies airborne equipment capable of operation on these
ending in an odd tenth plus one twentieth of a megahertz in the frequencies will not be imposed; and
band 108 - 11 1.975 MHZ shall be permitted to be utilized on c) operational service provided to international operthe
basis of regional agreement when they become applicable ators using 100 kHz airborne equipment is not
in accordance with the following: derogated.
a) for restricted use commencing 1 January 1973; 4.2.4 To protect the operation of airborne equipment
during the initial stages of deploying VORs utilizing 50 kHz
b) for general use on or after 1 January 1976. channel spacing in an area where the existing facilities may
not fully conform with the Standards in Annex 10, Volume I,
Note.- See Note to 4.2.3.1. Chapter 3, all existing VORs within interference range of a
facility utilizing 50 G z channel spacing shall be modified to
4.2.3 For regi0na1 assignment planning, the frequencies comply with the provisions of Annex 10, Volume I, 3.3.5.7.
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