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in use as of 1 February 1983 and using single sideband classes
of emission H2B, R3E, J3E, J7B or J9B, the peak envelope
2.4.1.8.1 Aemnauticai station installations. Except as
permitted by the relevant provisions of Appendix 27 Aer2 to
the Radio Regulations the peak envelope power (P ) supplied
to the antenna transmission line for H2B, H3E, J ~ EJ,7 B or
J9B classes of emissions shall not exceed a maximum value of
6 kW.
2.4.1.8.2 Aircraft station installations. The peak
envelope power supplied to the antenna transmission line for
H2B, H3E, J3E, J7B or J9B classes of emission shall not
exceed 400 W except as provided for jn Appendix 27 Aei2 of
the Radio Regulations as follows:
27/62 It is recognized that the power employed by aircraft
transmitters may, in practice, exceed the limits specified
in No. 27/54. However, the use of such increased
power (which normally should not exceed 600 W P,)
shall not cause harmful interference to stations using
frequencies in accordance with the technical principles
on which the Allotment Plan is based.
27/54 Unless otherwise specified in Part II 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:
7/11/96
No. 71
Part II Annex 10 - Aeronautical Telecommunications
Max. peak
envelope
Class of emission Stations Power (Po)
H2B, J3E, J7B, Aeronautical stations 6 kW
J9B. A3E*, H3E* Aircraft stations 400 W
(100% modulation)
Other emission Aeronautical stations 1.5 kW
such as AlA, FIB Aircraft stations 100 W
* A3E and H3E to be used only on 3 023 kHz and 5 680 kHz,
as well as in cases covered by Resolution No. 402.
2.4.1.9 Method of operatiorl. Single channel simplex
shall be employed.
7/11/96
No. 71
CHAPTER 3. SELCAL SYSTEM
3.1 Recommendation.- Where a SELCAL system is
installed, the following system characteristics should be
applied:
a) Transmitted code. Each transmitted code should be
made up of two consecutive tone pulses, with each
pulse contailzing two simultaneously transmitted tones.
The pulses should be of 1.0 plus or minus 0.25
secoads duration, separated by an interval uj. 0.2 plus
or minus 0.1 second.
b) Stability. The frequency of transmitted tones should be
held to plus or minus 0.15pm cent tolerance to ensure
proper operation of the airborne decoder
c) Distortion. The over-all audio distortion present on the
transmitted RF signal shozild not exceed 15 per cent.
d) Per cent modulation. The RF signal transmitted by the
ground radio station should contain, within 3 dB,
equal amounts of the two modulating tones. The
conzbination of tones should result ill a modulation
envelope having a nominal modulation percentage as
high as possible and in no case less than 60 per cent.
e) Transmitted tones. Tone codes should be made up of
various combinations of the tones listed in the
following table and designated by colour and letter as
indicated:
Designation Frequency (Hz)
Red A 312.6
Red B 346.7
Red C 384.6
Red D
Red E
Red F
Red G
Red H
Red J
Red K
Red L
Red M
Red P
Red Q
Red R
Red S
Note I.- It should be noted that the tones ore spaced by
Log-' 0.045 to avoid the possibility of harmonic combinations.
Note 2.- In accordance with the application principles
developed by the Sixth Session of the Communications Division,
the only codes at present used internationally are
selected from the red group.
Note 3.- Guidance material on the use of SELCAL
systems is contain,ed in Attachment A to Part 11.
Note 4.- The tones Red P, Red Q, Red R, and Red S are
applicable after I September 1985, in accordance with 3.2
below.
3.2 As from 1 September 1985, aeronautical stations
which are required to communicate with SELCAL-equipped
aircraft shall have SELCAL encoders in accordance with the
red group in the table of tone frequencies of 3.1 above. After
1 September 1985, SELCAL codes using the tones Red P,
Red Q, Red R, and Red S may be assigned.
7/11/96
No. 71 ANNEX 10 - VOLUME 111
CHAPTER 4. AERONAUTICAL SPEECH CIRCUITS
4.1 TECHNICAL PROVISIONS RELATING
TO INTERNATIONAL AERONAUTICAL SPEECH
CIRCUIT SWITCHING AND SIGNALLING
Note.- Guidance material on aeronautical speech circuit
switching and signalling is contained in ICAO Circular 183.
4.1.1 The use of circuit switching and signding to
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