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regional meetings.
4.1.8.2 The frequencies that may be allotted for use in the
aeronautical mobile (R) service in a particular region shall be
limited to the number determined as being necessary for
operational needs in the region.
Note.- The number of frequencies required in a
particular region is nonnally determined by the Council on the
recommendations of Regional Air Navigation Meetings. The
capabilities of VHF airborne equipment known to be widely used
in the region will be taken into account in this determination.
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- 111.975 MHz:
a) ILS in accordance with 4.2.2 and Volume I, 3.1.5;
b) VOR provided that:
1) no harmful adjacent channel interference is caused
to ILS:
2) only frequencies ending in either even tenths or even
tenths plus a twentieth of a megahertz are used.
- Band 11 1.975 - 11 7.975 MHz: VOR.
Note.- 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 Volume I.
Annex 10 - Aeronautical TeZecommunications Volume V
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
of a megahertz and their associated glide path channels.
4.2.2.1 ILS channels identified by localizer frequencies
ending in an odd tenth plus one twentieth of a megahertz in the
band 108 - 11 1.975 MHz shall be permitted to be utilized on
the basis of regional agreement when they become applicable
in accordance with the following:
a) for restricted use commencing 1 January 1973;
b) for general use on or after 1 January 1976.
Note.- See Note to 4.2.3.1.
4.2.3 For regional assignment planning, the frequencies
for VOR facilities shall be selected in the following order:
a) frequencies ending in odd tenths of a megahertz in the
band 11 1.975 - 117.975 MHz;
b) frequencies ending in even tenths of a megahertz in the
band 11 1.975 - 11 7.975 MHz;
C) frequencies ending in even tenths of a megahertz in the
band 108 - 1 1 1.975 MHz;
d) frequencies ending in 50 kHz in the band 111.975 -
117.975 MHz, except as provided in 4.2.3.1;
e) frequencies ending in even tenths plus a twentieth of a
megahertz in the band 108 - 11 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 -
1 11.975 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 - 11 1.975 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 bj1 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;
b) a general requirement for the carriage of ILS or VOR
airborne equipment capable of operation on these
frequencies will not be imposed; and
c) operational service provided to international operators
using 100 kHz airborne equipment is not
derogated.
4.2.4 To protect the operation of airborne equipment
during the initial stages of deploying VORs utilizing 50 kHz
channel spacing in an area where the existing facilities may
not fully conform with the Standards in Volume I, Chapter 3,
all existing VORs within interference range of a facility
utilizing 50 kHz channel spacing shall be modified to comply
with the provisions of Volume I, 3.3.5.7.
4.2.5 Frequency deployment. The geographical separation
between facilities operating on the same and adjacent
frequencies shall be determined regionally and shall be based
on the following criteria:
　
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