19.4 dBm linearly decreasing (in dB) to 11.4 dBm for elevation angles from 27.5 to 90 degrees In addition the following requirement for the mobile stations is applied: The total mobile station EIRP shall not exceed 30 dBm Note 1: EIRP defined as antenna gain in a specified elevation direction plus the average AeroMACS transmitter power. While the instantaneous peak power from a given transmitter may exceed that level when all of the subcarriers randomly align in phase, when the large number of transmitters assumed in the analysis is taken into account, average power is the appropriate metric. Note 2: The breakpoints in the EIRP mask are consistent with the elevation pattern of a +15 dBi peak, 120 degree sector antenna as contained in ITU-R F.1336-2. Note 3: These values were derived using the worst-case analysis described. Other approaches involving higher powers may be acceptable, however additional analysis must be performed to ensure the total interference allowable at the FSS satellites, consistent with ITU requirements, is not exceeded. Note 4: If a sector contains multiple transmit antennas (e.g., MIMO), the specified power limit is the sum of the power from each antenna. 3.1.2 Interference 3.1.2.1 As described in section 3.yyyy, the implementation of AeroMACS needs to be planned in a way that it will minimize the risk for potential interference to FSS. In particular the assignments of the channels and the ground antenna patterns and antenna tilt should be considered. 3.1.2.2 Where antenna tilt is employed, it is highly recommended that site surveys are undertaken to ensure that extraneous reflections do not result in further interference. 3.1.2.3 In order to spread evenly the interference to FSS, the assignment of AeroMACS channels should be distributed uniformly over areas containing several airports. Note: The above recommendation is particularly relevant for the case of airports not using all AeroMACS channels. 3.1.2.4 It is also recommended that the local AeroMACS implementations (?in conjunction with regional/global bodies????) optimize the ground antenna gain to minimize impact to the FSS services.
19.4 dBm linearly decreasing (in dB) to 11.4 dBm for elevation angles from 27.5 to 90 degrees In addition the following requirement for the mobile stations is applied: The total mobile station EIRP shall not exceed 30 dBm Note 1: EIRP defined as antenna gain in a specified elevation direction plus the average AeroMACS transmitter power. While the instantaneous peak power from a given transmitter may exceed that level when all of the subcarriers randomly align in phase, when the large number of transmitters assumed in the analysis is taken into account, average power is the appropriate metric. Note 2: The breakpoints in the EIRP mask are consistent with the elevation pattern of a +15 dBi peak, 120 degree sector antenna as contained in ITU-R F.1336-2. Note 3: These values were derived using the worst-case analysis described. Other approaches involving higher powers may be acceptable, however additional analysis must be performed to ensure the total interference allowable at the FSS satellites, consistent with ITU requirements, is not exceeded. Note 4: If a sector contains multiple transmit antennas (e.g., MIMO), the specified power limit is the sum of the power from each antenna. 3.1.2 Interference 3.1.2.1 As described in section 3.yyyy, the implementation of AeroMACS needs to be planned in a way that it will minimize the risk for potential interference to FSS. In particular the assignments of the channels and the ground antenna patterns and antenna tilt should be considered. 3.1.2.2 Where antenna tilt is employed, it is highly recommended that site surveys are undertaken to ensure that extraneous reflections do not result in further interference. 3.1.2.3 In order to spread evenly the interference to FSS, the assignment of AeroMACS channels should be distributed uniformly over areas containing several airports. Note: The above recommendation is particularly relevant for the case of airports not using all AeroMACS channels. 3.1.2.4 It is also recommended that the local AeroMACS implementations (?in conjunction with regional/global bodies????) optimize the ground antenna gain to minimize impact to the FSS services.