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transmitters may, in practice, exceed the limits
specified in No. 27/60. However, the use of such
increased power (which normally should not exceed
600 W Pp) shall not cause harmful interference to
stations using frequencies in accordance with the
technical principles on which the Allotment Plan is
based.
527160 Unless otherwise specified in Part LI of this
Appendix, the peak envelope powers supplied to thc
antenna transmission line shall not exceed the
maximum values indicated in the table below; the
corresponding peak effective radiated powers being
assumed to be equal to two-thirds of these values:
Class of enzission Stations
Max. peak
envelope
power fPp)
H2B, J3E, J7B, Aeronautical stations 6 kW
J9B, A3E*, H3E* Aircraft stations 400 W
(1 00% modulation)
Other emission Aeronautical stations 1.5 kW
such as AIA, FIB Aircraft stations 100 W
* A3E and H3E to bc used only on 3 023 kHz and 5 680 kHz.
2.4.1.9 Method of operation. Single channel simplex shall
be employed.
Annex 10 - Aeronautical Telecommunications Volume ZZZ
Rgure 2-1. Required spectrum limits (in terms of mean power) for aircraft station transmitter
types and for aeronautical station transmitters first installed before 1 February 1983
SSB
assigned
frequency
-I,-' - +---
I
I
I I
I I
I '
1.5 1
I t
I I
I ; '2 k~zt 2 kHz
+?-
OdB
-25 dB
I I
I '
4 6 kHz
!
6 kHz
I T b
-35 dB
4 10 kHz
I I
10 kHz *
SSB a) aircraft statlon
carrier (reference) transmitters: - 40 dB
frequency b) aeronauticai station
transmitters:
- [43 + I 0 10g,~P, (W) ] dB
CHAPTER 4. AERONAUTICAL SPEECH CIRCUITS
4.1 TECHNICAL PROVISIONS RIELATING
TO INTERNATIONAL AERONAUTICAL SPEECH
CIRCUIT SWITCHING AND SIGNALLING FOR
GROUND-GROUND APPLICATIONS
Note.- Guidance material on the inzplem,entation of
aemnai~tical speech circuit switching and signalling for
ground-ground applications is contained in the Manual on Air
Trufic Services (ATS) Gmund-Ground Voice Switching and
Signalling. The material includes explanation of terms, perj5ornzance
parameters, guidance on basic call types and
additional functions, references to appropriate ISO/IEC
international standards and ITU-T recommendations,
guidance on tlze use of signulling systems, details of the
recommen,ded numbering scheme and gztidance on migmtiorz
4.1.4 Recommendation.- In addition to the ability to
make basic telephone calls, the following fclnctions should be
provided in order to meet the requirements set out in Annex 11:
a) means of indicating the calling/called party identity;
h) moans of initiating urgent/priority calls; and
c) conference capabilities.
4.1.5 Recommendation.- The characteristics of tfze
circciits used in aemnauticul speech circuit switching and
signalling should conform to appropriate ISO/IEC irzternational
standards and ITU-T recommendations.
to fiiture schemes.
4.1.6 Recommendation.- Digital signalling systenzs
4.1.1 ~h~ use of Switching and to should be zlsed wherever thew use can be justified in terms of
provide speech circuits to intcrc~nnect ATS units not any of the following:
interconnected by dedicated circuits shall be by agreement
between the Administrations concerned. a) improvecl quality of service;
4.1.2 The application of aeronautical speech circuit B) impmved user facilities; or
switching and signalling shall be made 011 the basis of regional
air navigation agreements. c) reduced costs where quulity of service is maintained.
4.1.3 Recommendation.- The ATC commurzication 4.1.7 Recommendation.- The characteristics of
requirements defined in Annex 11, Section 6.2 should be met superv~sory tones to bo used (such as ,jnging, busy, number
by implementation qf one or mow of the following basic three unobtainable) should conform to appropl-iate 1TU-T
call types: recommen.dations.
a) instanhnenus access;
b) direct access; and
C) indirect access.
4.1.8 Recommendation.- To rake advantage of the
benefits of interconn,ecting regional and national ueronauticul
speech networks, the interna~ional aemnauticul telephone
network n~irnberirzgs cherne should be used.
ANNEX 10 - VOLUME I11
CHAPTER 5. EMERGENCY LOCATOR TRANSMITTER (ELT)
FOR SEARCH AND RESCUE
5.1 GENERAL
5.1.1 Until 1 January 2005, emergency locator transmitters
shall operate either on both 406 MHz and 121.5 MHz or on
121.5 MHz.
Note.- From 1 January 2000, ELTs operating on
121.5 Mm will be required to meet the improved technical
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