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asvurnption of 60 dB efSecrive adjacent channel rejection crt 2.3.2.8.4.1 The agreement indicated in 2.3.2.8.4 shall
plus or minus 25 kHz, 50 kHz or 101) kHz from the assigned provide at least two years' notice of mandatory compliance of
frequency as upprwpnate to the channel spacing environment. airborne systems.
Part II Annex 10 - Aeronautical Telecommunications
2.3.3 Interterence immunity 2.4.1.1.2 The equipment shall be capable of operating on
performance integral multiples of 1 kHz.
2.3.3.1 After 1 January 1998, the VHF communications
receiving system shall provide satisfactory performance in the 2.4.1.2 SIDEBAND SELECTION
presence of two signal, third-order intermodulation products
caused by VHF FM broadcast signals having levels at the 2.4.1.2.1 The sideband transmitted shall be that on the
receiver input of minus 5 dBm. higher frequency side of its camer (reference) frequency
2.3.3.2 After 1 January 1998, the VHF communications
receiving system shall not be desensitized in the presence of 2.4.1.3 CARRIER(R EFERENCFER)E QUENCY
VHF FM broadcast signals having levels at the receiver input
of minus 5 dBm. 2.4.1.3.1 Until 1 February 1983 channel utilization shall
be in conformity with the AllMment Plan in either Appen-
Note.- Guidance material on immuntm criteria to be used
dix 27 EARC* or Appendix 27 A d * * as follows:
for the performance quoted in 2.3.3.1 aid 2.3.3.2 above is
contained in Attachment A to Part 11, 1.3.
2.3.3.3 After 1 January 1995, all new installations of
airborne VHF communications receiving systems shall meet
the provisions of 2.3.3.1 and 2.3.3.2 above.
2.3.3.4 Recommendation.- Airborne VHF communications
receiving systems meeting the immunity perfonnance
Standards of 2.3.3.1 and 2.3.3.2 above should be placed into
operation at the earliest possible date.
a) where Appendix 27 EARC channels are used the carrier
(reference) frequency shall in the case of the upper half
of the previous DSB channel be the same 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 H z lower than the
carrier (reference) frequency of that channd;
c) where 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 SINGLE SIDEBAND (SSB) HF 2.4.1.3.2 With effect from 1 February 1983 channel
COMMUNICATION SYSTEM utilization shall be in conformity with the table of canier
CHARACTERISTICS FOR USE IN THE (reference) frequencies at,27/16 and the Allotment Plan at 271
AERONAUTICAL MOBILE SERVICE 186 to 271207 inclusive (or frequencies established on the
basis of 27/21, as may be appropriate) of Appendix 27 AcR.
2.4.1 The characteristics of the air-ground HF SSB
system, where used in the Aeronautical Mobile Service, shall Note.- It is intended that only the carrier (reference)
be in conformity with the following specifications. frequency be promulgated in Regional Plans and Aemnauticul
Publications.
2.4.1.1 FREQUENCRYA NGE
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 Intmduction to Volume V Chapter 3, and
Figures 2-1 and 2-2 located at the end of this chapfel:
Note 2.- The Extraordinary Administrative Radio
Conference (EARC), Geneva, 1966, established an Allotment
Plan (Appendix 27 to the Radio Regulations). The ZTU World
Adminisrrative Radio Conference, Aeronautical Mobile (R)
2.4.1.4 CLASSESO F EMISSION AND
CARRIER SUPPRESSION
2.4.1.4.1 The system shall utilize the suppr~ssecl carrier
class of emission J3E (also J7B and J9B as applicable). When
SELCAL is employed as specified in Chapter 3 of Part II, the
installation shall utilize class H2B emission.
2.4.1.4.2 By 1 February 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.
* Appendix 27 EARC means Appendix 27 to the Radio Regulations
(1968 Edition').
Service, Geneva, 1978, established a new Allotment Plan ** Appendix 27 ~ emfeans Appendix 27, as amended by the ITU
(Appendix 27, Aer2 to the Radio Regulations). World Administrative Radio Conference (1978).
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