RES418 – 318 – ANNEX 1 TO RESOLUTION 418 (REV.WRC-15) 1 In implementing aeronautical mobile telemetry (AMT), administrations shall utilize the following criteria: – limit transmissions to those from aircraft stations only (see No. 1.83); – the operation of aeronautical telemetry systems within the frequency band 5 091-5 150 MHz shall be coordinated with administrations operating microwave landing systems (MLS) and whose territory is located within a distance D of the AMT flight area, where D is determined by the following equation: D 43 10(127.55 − 20 log( f ) + E)/20 where: D : separation distance (km) triggering the coordination f : minimum frequency (MHz) used by the AMT system E : peak equivalent isotropically radiated power density (dBW in 150 kHz) of the aircraft transmitter. 2 For the protection of the fixed-satellite service (FSS), a telemetry aircraft station in the frequency band 5 091-5 250 MHz shall be operated in such a manner that one aircraft station transmitter power flux-density be limited to −198.9 dB(W/(m2 · Hz)) at the FSS satellite orbit for spacecraft using Earth coverage receive antennas. Such pfd limit per aircraft transmitter has been derived under the assumptions that the FSS satellite orbit is at 1 414 km altitude and that a total of 21 co-frequency AMT transmitters operate concurrently within the field of view of the FSS satellite. In case of fewer than 21 AMT co-frequency transmitters operating simultaneously in view of the satellite, the transmitter power can be adjusted so as not to exceed an aggregate pfd at the satellite of −185.7 dB(W/(m2 · Hz)), which corresponds to a Tsatellite/Tsatellite of 1%. 3 For the protection of the mobile service in the frequency band 5 150-5 250 MHz, the maximum pfd produced at the surface of the Earth by emissions from an aircraft station of an aeronautical mobile service system, limited to transmissions of telemetry for flight testing, shall not exceed: −79.4 dB(W/(m2 · 20 MHz)) − Gr (θ). Gr (θ) represents the mobile service receiver antenna gain versus elevation angle θ and is defined as follows: Wireless access system elevation antenna pattern Elevation angle, θ (degrees) Gain (θ) (dBi) 45 θ 90 − 4 35 θ 45 −3 0 θ 35 0 −15 θ 0 −1 −30 θ −15 − 4 −60 θ −30 − 6 −90 θ −60 −5