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the frequencies 3 023 kHz and 5 680 kHz, the class of emission
J3E should be used; howeve4 since maritime mobile and land
mobile services may 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.
1/1l/01
No. 76
Annex 10 - Aeronautical Telecommunications Volume ZZZ
2.4.1.4.6 Aircraft station transmitters shall be capable of
at least 26 dB carrier suppression with respect to peak
envelope power (Pp) for classes of emission J3E, J7B or J9B.
2.4.1.4.7 Aeronautical station transmitters shall be
capable of 40 dB carrier suppression with respect to peak
envelope power (P,,) for classes of emission J3E, J7B or J9B.
2.4.1.5 AUDIO FREQUENCY BANDWIDTH
2.4.1.5.1 For radiotelephone emissions the audio
frequencies shall be limited to between 300 and 2 700 Hz 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 aircraft and aeronautical station transmitter
types first installed before I February 1983 the audio
frequencies will be limited 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.
2.4.1.6 FREQUENCTOYL ERANCE
2.4.1.6.1 The basic frequency stability of the transmitting
function for classes of emission J3E, J7B or J9B shall be such
that the difference between the actual carrier of the
transmission and the carrier (reference) frequency shall not
exceed:
- 20 Hz for airborne installations;
- 10 Hz for ground installations.
2.4.1.6.2 The basic frequency stability of the receiving
function shall be such that, with the transmitting function
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 SPECTRUM LIMITS
2.4.1.7.1 For aircraft station transmitter types and for
aeronautical station transmittcrs first installed before 1
February 1983 and using single sideband classes of emission
H2B, H3E, J3E, J7B or J9B the mean power of any 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 lcast 25 dB;
-on any frequency removed by 6 kHz or more up to 10
kHz from the assigned frequency: at least 35 dB;
- on any frequency removed from the assigned frequency
by 10 kHz or more:
a) aircraft station transmitters: 40 dB;
b) aeronautical station transmitters:
2.4.1.7.2 For aircraft station transmitters first installed
after 1 Fcbruary 1983 and for 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 be
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;
- on any frequency removed from the assigned frequency
by 7.5 kHz or more:
a) aircraft station transmitters: 43 dB;
b) aeronautical station transmitters: for transmitter
power up to and including 50 W:
For transmitter power more than 50 W: 60 dB.
Note.-- See Figuxs 2-1 and 2-2.
2.4.1.8 POWER
2.4.1.8.1 Aeronautical station installations. Except as
permitted by thc,relevant provisions of Appendix S27 to the
ITU Radio Regulations, thc peak envelope power (Pp) supplied
to the antenna transmission line for H2B, H3E, J3E, J7B or
J9B classes of emissions shall not cxceed a maximum value of
6 kW.
2.4.1.8.2 Aircraft station instullations. The peak envelope
power supplicd 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 527 of the ITU Radio
Regulations as follows:
1111101
No. 76
Part 11 Annex 10 - Aeronautical Telecommunications
S27168 It is recognized that the power employed by aircraft
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