References
1 ICAO Annex 10 Aeronautical Telecommunications Volume III - Communication Systems Part I - Digital Data Communication Systems; Part II - Voice Communication Systems.
2 ICAO Annex 10 Aeronautical Telecommunications Volume V (Aeronautical Radio Frequency Spectrum Utilization).
3 CAA Paper 96006 Co-Channel Interference Study (Report prepared by Roke Manor Research Ltd and published by the CAA).
4 EUROCAE ED-67 'Minimum Operational Performance Specification for devices that prevent unintentional or continuous transmissions' April 1991.
Part 2 Requirements
CAP 670 Air Traffic Services Safety Requirements
5 Safety objective
The equipment and systems at Aeronautical Radio Stations shall provide complete, identified, accurate and uncorrupted voice and data link communications for Air Traffic Services (1002).
6 General Requirements
The requirements in this section are applicable to equipment and systems at all Air Traffic Service Aeronautical Radio Stations operating on Aeronautical Mobile (R) Service frequency assignments.
6.1 International Standards
NOTE: This document incorporates the relevant SARPs from ICAO Annex 10 and Annex 11 together with material from the ITU Radio Regulations.
6.1.1 The equipment, systems, services and facilities shall comply with the applicable international standards, recommended practices and procedures for air navigation services in Annex 10 and Annex 11 to the Convention on International Civil Aviation (376).
6.1.2 The equipment, systems, services and facilities shall comply with the applicable Radio Regulations of the International Telecommunications Union (377).
6.2 Radio Spectrum Management
6.2.1 The equipment and systems shall be designed and constructed to operate within the Aeronautical Mobile (R) Service allocation 117.975 MHz to 137.000 MHz (378). The first and last assignable frequencies being 118.000 MHz and 136.975 MHz. For radiotelephony channel spacing is either 25 kHz or 8.33 kHz using Double Sideband (DSB) Amplitude Modulation (AM) full carrier with ITU emission designator 6K80A3EJN for 25 kHz and 5K00A3EJN for 8.33 kHz channel spacing (379). For data link communications channel spacing is 25 kHz using Double Sideband (DSB) Amplitude Modulation (AM) full carrier with ITU emission designators 13K0A2DAN for ACARS using MSK modulation, 14K0G1D for VDL Mode 2 using D8PSK modulation and 13K0F7D for VDL Mode 4 using GFSK modulation (380).
NOTE 1:The equipment and systems are only required to be capable of operation in the modes specified by the ANO Approval. However, new equipment may be purchased with options for other modes of operation to cater for future operational requirements.
NOTE 2:Equipment and systems at specific Aeronautical Stations are required to be capable of operation with a channel spacing of 8.33 kHz to provide an Air Traffic Control Service.
6.2.2 The equipment and systems shall be installed, operated and maintained in compliance with the terms of specific location dependent or general frequency assignment(s) and the terms and conditions of an ANO Approval granted in respect of the Air Traffic Services being provided (381).
Guidance: The frequency assignments may include parameters such as the DOC, minimum field strength within the DOC, maximum field strength outside the DOC and/or minimum and maximum effective radiated power (ERP). These parameters are designed to support reliable communications and to reduce the probability of co-channel or adjacent channel interference to other users. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：CAP 670 Air Traffic Services Safety Requirements 2(8)
