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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 aircra8 and aeronaiitical station transmitter
types first installed before I February 1983 the audio
frequencies will be limited to 3 000 HZ.
* Appndix 27 EARC means Appendix 27 to the Radio Regulations
Note.- It is intended that only the carrier (reference) (1968 Edition).
frequency be promulgated in Regional Plans and Aeronautical *+ Appendix 27 ~ e rm2an s Appendix 27, as amended by the ITU World
Publications. Administrative Radio Conference (1978).
7\11/96
No. 71
Annex 10 - Aeronautical Telecommunications Volume 111
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
SSB
assigned
frequency
-1- -I-----QdB
I '
I I
fi
7/11/96
No. 71
12 kHz 2 kHz
I -25 dB
r
1 I r2 6kHz -6kHz -
r( 10 kHz 4 10 kHz . -35 dB
I
"
*
t a) aircraft station
SSB transmitters: -40 dB
carrier (reference) * b) aeronautical station
frequency transmitters:
-[43 + 10 logXO Pm dB
Part II Annex 10 - Aeronautical Telecommunications
Figure 2-2. Required spectrum limits (in terms of peak power) for aircraft station transmitters
first installed after 1 February 1983 and aeronautical, station transmitters in use after 1 February 1983
SSB
assigned
frequency
+--I----
711 1/96
No. 71
0 dB
-30 dB
,
I ' Pi 1.5 1.5
1 I
4 a 7.5 I 4 7.5
-38 dB
- -. kHz - kHz I *
a) aircraft station transmitters: -43 dB
carrier (SrSefBe rence) *b) iaero nautical station transmitters:
for transmitter power up to and including 50 W:
frcquency -143 + 10 logl0P, Oy)] dB
for transmitter power more than 50 W, the
attenuation shall be at least 60 dB
A
I kHz - .b I
Annex 10 - Aeronautical Telecommunications Volume 111
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.
2.4.1.6.1 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-dl 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.
power (P,) 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 qny 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 msmitters: for transmitter
power up to and including SO W:
For transmitter power more than 50 W: 60 dB.
Note.- See Figures 2-1 and 2-2.
2.4.1.7 SPECTRUMLI MITS
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 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 lrNz from the assigned frequency: at least 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 February 1983 and for aeronautical station transmitters
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