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No. 75
Annex 10 - Aeronautical Telecommunications Volume III
2.4.1.4.3 Until 1 February 1982 aeronautical stations and
aircraft stations equipped for single sideband operations shall
aIso be equipped to transmit class H3E emission where
r~quired to be compatible with reception by double sideband
equipment. Effective this date the use of class H3E emission
shall be discontinued except as provided in 2.4.1.4.4 below.
2.4.1.4.4 Recommends tion.- For srarion. directly
involved in co-ordinated search and rescue operations using
the frequencies 3 023 kHz and 5 680 kHz, the class of emission
J3E should be used; howevel; since maritime mobile and land
mobile services r q be involved, A3E and H3E classes of
emission may be used.
2.4.1 -4.5 After 1 April 1981 no new DSB equipment shall
be installed.
2.4.1.4.6 Aircraft station transmitters shall be capable of
at least 26 dB carrier suppression with respect to peak
stabilities specified in 2.4.1.6.1 above. the over-all frequency
difference between ground and airborne functions achieved In
service and including Doppler shift, does not exceed 45 Hz.
However, a greater frequency difference shall be permitted in
the case of supersonic aircraft.
2.4.1.7.1 For aircraft station transmitter types and for
aeronautical station transmitters first installed before 1
February 1983 and using single sideband classes of emission
H2B, H3E, J3E, J7B or J9B the mean power of my emission
on any discrete frequency shall be less than the mean power
(P,) of the transmitter in accordance with the following:
- on any frequency removed by 2 kHz or more up to 6
kHz from the assigned frequency: at least 25 dB;
envelope paver (Pp) for c l a ~ so~f se mission J ~ EJ7B or J ~ B . -on any frequency removed by 6 kHz or more up to 10
2.4.1.4.7 Aeronautical station transmitters shall be kHz from the assigned frequency: at least 35 dB;
capable of 40 dB carrier suppression with respect to peak
envelope power (Pp) for classes of emission J3E, J7B or 19B. - on any frequency removed from the assigned frequency
by 10 kHz or more:
2.4.1.5 AUDIO FREQUENCY BANDWIDTH a) aircraft station transmitters: 40 dB;
2.4.1.5.1 For radiotelephone emissions the audio
frequencies shall be limited to between 300 and 2 700 1-12 and
the occupied bandwidth of other authorized emissions shall not
exceed the upper limit of J3E emissions. In specifying these
limits, however, no restriction in their extension shall be
implied in so far as emissions other than J3E are concerned,
provided that the limits of unwanted emissions are met (see
2.4.1.7 below).
Note.- For aircrafr and aerotlllutical srarion transmitter
types first installed before 1 Februav 1983 the audio
freqrrclzcies will be lirnited to 3 000 Hz.
2.4.1.5.2 For other authorized classes of emission the
modulation frequencies shall be such that the required
spectrum limits of 2.4.1.7 below will be met.
b) aeronautical station transmitters:
2.4.1.7.2 For aircraft station transmitters first installed
after 1 February 1983 and far aeronautical station transmitters
in use as of 1 February 1983 and using single sideband classes
of emission H2B, H3E, J3E, J7B or J9B, the peak envelope
power (Pp) of any emission on any discrete frequency shall he
less than the peak envelope power (Pp) of the transmitter in
accordance with the following:
- on any frequency removed by 1.5 kHz or more up to 4.5
kHz from the assigned frequency: at least 30 dB;
- on any frequency removed by 4.5 kHz or more up to 7.5
kHz from the assigned frequency: at least 38 dB:
2.4.1.6 FREQUENCY TOLERANCE ' - on any frequency removed from the assigned frequency
by 7.5 kHz or more:
2.4.1.6.1 The basic frequency stability of the transmitting
function for classes of emission J ~ EJ.7 B br J9B shall, he such
that the difference between the actual carrier of the a) aircraft station transmitters: 43 dB;
transmission and the. carrier (reference) frequency shall not
exceed: b) aeronautical station transmitters: for transmiuer
power up to and including 50 W:
- 20 Hz for airborne installations;
- 10 Hz for ground installations.
For transmitter power more than 50 W: 60 dB.
2.4.1.6.3 The basic frequency stability of the receiving
function shall be such that, with the transmitting function Note.- See Figures 2-1 and 2-2.
Part ZI Annex 10 - Aeronautical Telecommunicuiions
2.4.1.8.1 Aeronuutical station installations. Except as
permitted by the relevant provisions of Appendix 27 Aed to
the Radio Regulations the peak envelope power (P ) supplied
to the antenna transmission line for H2B, H3E. J ~ EJ,7 B or
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