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25 kHz, 50 kHz and 100 kHzfrom the ussigned frequenc)lfbr 2.4 SINGLE SIDEBAND (SSB) HF
receiving systems intended to operate in channel spacirlg COMMUNICATION SYSTEM
environments of 25 kHz, 50 and I00 kHz respectively. CHARACTERISTICS FOR USE IN THE
AERONAUTICAL MOBILE SERVICE
Note.- Frcquenq planning is normally bused on an
assumptio~i of 60 dB efective adjacent channel rejection at 2.4.1 The characteristics of the air-ground HF SSB
plus or minus 25 kHz, 50 fi or 100 kHzfrom the assigned System, where used in the Aeronautical Mobile Service, shall
frequency as uppropriare to the channel spacing environment. be in conformity with the following specifications.
7111196
No. 71
Part II Annex 10 - Aeronautical Telecommunications
2.4.1,.1 FREQUENRCAYNG E
2.4.1.1.1 HF SSB installations shall be capable of operation
at any SSB carrier (reference) frequency available to the
Aeronautical Mobile (R) Service in the band 2.8 MHz to
22 MHz and necessary to meet the approved assignment plan
for the region(s) in which the system is intended to operate,
and in compliance with the relevant provisions of the Radio
Regulations.
Note 1.- See Introduction to Volume 1.: Chapter 3 and
Figures 2-1 and 2-2.
Note 2.- The Extraordinary Administrative Radio Conference
(EARC), Geneva, 1966, established an Allotment Plan
(Appendix 27 to the Radio Regulations). The ITU World
Administrative Radio Conference, Aeronautical Mobile (R)
Service, Geneva, 1978, established a new Allotment Plan
(Appendix 27, Aer2 to the Radio Regulations).
2.4.1.1.2 The equipment shall be capable of operating on
integral multiples of 1 kHz.
2.4.1.2 SIDEBANSDE LECTION
2.4.1.4 CLASSESO F EMISSION AND
CARRIER SUPPRESSION
2.4.1.4.1 The system shall utilize the suppressed carrier
class of emission J3E (also J7B and J9B as applicable). When
SELCAL is employed as specified in Chapter 3 of Part 11, the
installation shall utilize class H2B emission.
2.4.1.4.2 By 1 Febmary 1982 aeronautical stations and
aircraft stations shall have introduced the appropriate class(es)
of emission prescribed in 2.4.1.4.1 above. Effective this date
the use of class A3E emission shall be discontinued except as
provided in 2.4.1.4.4 below.
2.4.1.4.3 Until 1 February 1982 aeronautical stations and
aircraft stations equipped for single sideband operations shall
also be equipped to transmit class H3E emission where
required 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 Recommendation.- For stations 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; howeve?; since maritime mobile
and land mobile services may be involved, A3E and H3E
2.4.1.2.1 The sideband transmitted shall be that on the classes of emission Mly be used,
higher frequency side of its carrier (reference) frequency.
2.4.1.4.5 After 1. April 1981 no new DSB equipment
2.4.1.3 CARRIER(R EFERENCE) FREQUENCY shall be installed.
2.4.1.3.1 Until 1 February 1983 channel utilization shall 2.4.1.4.6 Aircraft station transmitters shall be capable of
be in with the Allotment Plan in either at least 26 dB callkr with to peak
dix 27 EARC* or Appendix 27 Aed** as follows: envelope power (Pp) for classes of emission J3E, J7B or J9B.
a) where Appendix 27 EARC channels are used the 2.4.1.4.7 Aeronautical station transmitters shall be
carrier (reference) frequency shall in the case of the capable of 40 dB carrier suppression with respect to peak
upper half of the previous DSB channel be the same envelope power (Pp) for classes of emission J3E, J7B or J9B.
as the carrier (reference) frequency of that channel;
b) where Appendix 27 EARC channels are used the
carrier (reference) frequency shall in the case of the
lower half of the previous DSB channel be 3 kHz
lower than the carrier (reference) frequency of that
channel;
c) whcre Appendix 27 Aed channels are used the carrier
(reference) frequency shall be in conformity with the
table at 27/16 of Appendix 27 Aer2.
2.4.1.3.2 With effect from 1 February 1983 channel
utilization shall be in conformity with the table of carrier
(reference) frequencies at 27/16 and the Allotment Plan at
271186 to 271207 inclusive (or frequencies established on the
basis of 27/21, as may be appropriate) of Appendix 27 Aer2.
2.4.1.5 AUDIO FREQUENCY BANDWIDTH
2.4.1.5.1 For radiotelephone emissions the audio
frequencies shall be lirni~edto between 300 and 2 700 Hz and
the occupied bandwidth of other authorized emissions shall not
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