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2.2 SYSTEM CHARACTERISTICS OF spacing is introduced in accordance with Volume V, the radio
THE GROUND INSTALLATION frequency of operation shall not vary more than plus or minus
0.0001 per cent from the assigned frequency.
2.2.1 Transmitting function 2.2.2.2 Sensitivity. After due allowance has been made
for feeder loss and antenna polar diagram variation, the sensiti-
2.2.1.1 Frequency stability. The radio frequency of vity of the receiving function shall be such as to provide on a
operation shall not vary more than plus or millus 0.005 per high percentage of occasions an audio output signal with a
340 ANNEX 10 - VOLUME I11
Part I1 Annex 10 - Aeronautical Telecommunications
2.3.3 Interference immunity
performance
2.3.3.1 After 1 January 1998, the VHF comrnutli~ations
receiving system shall provide satisfactory performance in the
presence of two signal, third-order intermodulation products
caused by VHF FM broadcast signals having levels at the
receiver input of minus 5 dBm.
2.3.3.2 After 1 January 1998, the VHF communications
receiving system shall not be desensitized in the presence of
VHF FM broadcast signals having levels at the receiver input
of minus 5 dBm.
Note.- Guidance material on immunity criteria to be used
for the performance quoted in 2.3.3.1 and 2.3.3.2 above is
contained in Attachment A to Part II, 1.3.
2.3.3.3 After 1 January 1995, all new installations of
airborne VHP 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 perj6ormance
Standards of 2.3.3.1 and 2.3.3.2 above should be placed into
operation at the earliest possible date.
2.4 SINGLE SIDEBAND (SSB) EW
COMMUNICATION SYSTEM
CHARACTERISTICS FOR USE IN THE
AERONAUTICAL MOBILE SERVICE
2.4.1 The characteristics of the air-ground WF SSB
systcm, where used in the Acronautical Mobile Service, shall
be in conformity with the following specifications.
2.4.1.1 FREQUENCY RANGE
2.4.1.1.1 HE 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($) 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 Chapter 3, and
Figures 2-1 and 2-2.
Notc 2.- The ITU World Administrative Radio Conference,
Aeronautical Mobile (R) Service, Geneva, 1978, established a
new Allotment Plan (Appendix 27, Aer to the Radio Regulations)
based on single sideband replacing the earlier double
sidebard Allotment Plan. The World Radiocommunicution
Conference 1995 redesignuted it as Appendix S.27. Minor
editorial changes were made at the World Radiocomnzunication
Conference 1997.
2.4.1.1.2 Thc equipment shall be capable of operating on
integral multiples of 1 kHz.
2.4.1.2 SIDEBANDSE LECTION
2.4.1.2.1 The sideband transmitted shall be that on the
higher frequency side of its carrier (reference) frequency.
2.4.1.3 CARRIER(R EFERENCE) FREQUENCY
2.4.1.3.1 Channel utilization shall be in conformity with
the table of carrier (rcference) frequencies at 27/16 and the
Allotment Plan at 271186 to 271207 inclusive (or frequencies
established on the basis of 27121, as may be appropriate) of
Appendix S27.
Note.- It is intended that only the carrier (reference)
frequency be promulgated in Regional Plans and Aeronautical
Publications.
2.4.1.4 CLASSES OF EMISSION AND
-CARRIER SUPPRESSION
2.4.1.4.1 The system shall utilize the suppressed camer
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 bclow.
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 datc 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 station,s directly
involved in co-ordinated search and rescue opemtions using
　
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