Publication: Magyar Közlöny
Issue: MK-2009-104 (Year: 2009, Number: 104)
Era: 2004-2010
Section: 
Paragraph Index: 2116

f) Within 8 bit periods after the end of the Active state, the RF output power at the PMP shall fall to a level not to exceed –80 dBm. Note.— This unwanted radiated power restriction is necessary to ensure that the transmitting subsystem does not prevent closely located UAT receiving equipment on the same aircraft from meeting its requirements. It assumes that the isolation between transmitter and receiver equipment at the PMP exceeds 20 dB. Annex 10 — Aeronautical Communications Volume III 22/11/07 I-12-4 12.1.3 Mandatory carriage requirements Requirements for mandatory carriage of UAT equipment shall be made on the basis of regional air navigation agreements which specify the airspace of operation and the implementation timescales for the carriage of equipment, including the appropriate lead time. Note.— No changes will be required to aircraft systems or ground systems operating solely in regions not using UAT. 12.2 SYSTEM CHARACTERISTICS OF THE GROUND INSTALLATION 12.2.1 Ground station transmitting function 12.2.1.1 GROUND STATION TRANSMITTER POWER 12.2.1.1.1 Recommendation.— The effective radiated power should be such as to provide a field strength of at least 280 microvolts per metre (minus 97 dBW/m2) within the service volume of the facility on the basis of free-space propagation. Note.— This is determined on the basis of delivering a –91 dBm (corresponds to 200 microvolts per metre) signal level at the PMP (assuming an omnidirectional antenna). The 280 µV/m recommendation corresponds to the delivery of a -88 dBm signal level at the PMP of the receiving equipment. The 3 dB difference between –88 dBm and –91 dBm provides margin for excess path loss over free-space propagation. 12.2.2 Ground station receiving function Note.— An example ground station receiver is discussed in Section 2.5 of Part II of the Manual on the Universal Access Transceiver (UAT) (Doc 9861), with UAT air-to-ground performance estimates consistent with use of that receiver provided in Appendix B of that manual. 12.3 SYSTEM CHARACTERISTICS OF THE AIRCRAFT INSTALLATION 12.3.1 Aircraft transmitting function 12.3.1.1 AIRCRAFT TRANSMITTER POWER The effective radiated power shall be such as to provide a field strength of at least 225 microvolts per metre (minus 99 dBW/m2) on the basis of free-space propagation, at ranges and altitudes appropriate to the operational conditions pertaining to the areas over which the aircraft is operated. Transmitter power shall not exceed 54 dBm at the PMP. Note 1.— The above field strength is determined on the basis of delivering a –93 dBm (corresponds to 160 microvolts per metre) signal level at the PMP (assuming an omnidirectional antenna). The 3 dB difference between 225 µV/m and 160 µV/m provides margin for excess path loss over free-space propagation when receiving a long UAT ADS-B message. A 4 dB margin is provided when receiving a basic UAT ADS-B message. Part I Annex 10 — Aeronautical Communications I-12-5 22/11/07 Note 2.—Various aircraft operations may have different air-air range requirements depending on the intended ADS-B function of the UAT equipment. Therefore different installations may operate at different power levels (see 12.1.2.3.1). 12.3.2 Receiving function 12.3.2.1 RECEIVER SENSITIVITY 12.3.2.1.1 LONG UAT ADS-B MESSAGE AS DESIRED SIGNAL A desired signal level of –93 dBm applied at the PMP shall produce a rate of successful message reception (SMR) of 90 per cent or better under the following conditions:

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