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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 in Appendix 27 Aed 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 Pp) shall not cause harmful interference to
stations using frequencies in accordance with the
technical principles on which the Allotment Plan is
based.
Unless otherwise specified in Part II of this Appendix,
the peak envelope powers supplied to the 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 emission Stations Max. peak
envelope
power (Pp)
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 AIA, 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 operation. Single channel simplex shall
be employed.
Ul woo
No. 75
Annex 10 - Aeronautical Telecommunications Volume 111
SSB
assigned
frequency
SSB
carrier (reference)
frequency
a) aircrafl statlon
transmitters: -40 dB
b) aeronautical station
transmitters:
-[43 + 10 l~g,~P,,(,W ) ] dB
Figure 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
-urn No. 75
Part II Annex 10 - Aeronautical Telecommunications
Figure 2-2. Required spectrum limits (in terms of peak power) for aircraft station transmitters
Erst installed after 1 February 1983 and aeronautical station transmitters in use after 1 February 1983
SSB
assignad
frequency
I I
211m
No* 75
- , - - 4 - - - -
I
I I
I I
I I
I '
400 I
G I I
I I
I '
1.5 1 1.5
I kHz I kHz
+-??-
OdB
-30 dB
i
-
4 7.5 I I 7.5
kHz I h( F
I kHz
I *
SSB a) aircraft station transmitters: -43 dB
carrier (reference)
* I b) aeronautical station transmitters:
frequency for transmitter power up to and including 50 W:
-[43 * 10 Iog,,P, (W)] dB
for transmitter power more than 50 W, the
attenuation shall be at least 60 dB
I I
4
4.5
I ;
I 4.5
kHz b
1 1* kHz - -38 dB
CHAPTER 3. SELCAL SYSTEM
3.1 Recommendation.- Where a SELCAL system is
installed, the following qstem characteristics shorrld be
applied:
a) Transmitted code. Each tramitted code should be
made up of two consecutive tone pulses, with each pulse
containing two simultaneously transmitted tones. The
pulses should be of 1.0 plus or minus 0.25 seconds
duration, separated by an interval of 0.2 plus or minus
0.1 second.
b) Stability. The frequency of transmitted tones should be
held to plus or minus 0.15 per cent tolerance to ensure
proper operation of the airborne tiecodel:
c) Distortion. The over-ull audio distortion present on the
transmitted RF signal should 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 combination
of tones should result in a modulation envelope having
a nominal modulation percentage as high us possible
and in no casc less than 60 per cent.
e) Transmitted tones. Tone codes should be made up of
various com.binations of the tones listed in the
following table and desiqnated by colour and lener cis
indica kd;
Designation Frequency (HZ)
Red A
Red B
Red C
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 are 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
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