FCC adopted NTIA amendment for new rules specifying limits on per...
FCC adopted NTIA amendment for new rules specifying limits on permissible strength of out-of-band emissions from mobile earth stations. New rules were adopted because of concerns about interference with use of GPS or similar radionavigation services for airplane guidance…
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during landing approach in 1559-1610 MHz frequency band that may be generated by mobile earth stations at 1610-1660.5 MHz and 1990-2025 MHz. Mobile earth station operators must ensure equipment covered by their licenses performs in compliance with new emission restrictions. Some companies may have to alter, replace or decommission equipment currently in service. FCC action will affect 10 companies that have applied for 2 GHz mobile earth stations that are subject to new rules, Commission said. Following limits were adopted for mobile earth stations (MES) placed in service before July 21: (1) MES with assigned uplink frequencies between 1610- 1660.5 MHz can’t exceed effective isotropic radiated power (EIRP) density level of -70 dBW/MHz, averaged over any 20 millisecond interval, in 1559-1587.42 MHz. EIRP of discrete emissions under 700 Hz bandwidth generated by earth stations can’t exceed 80 dBW, averaged over 20 milliseconds. (2) Uplink frequencies at 1610-1626.5 MHz can’t exceed EIRP of - 64 dBW/MHz in 1587.42-1605 MHz band. EIRP of discrete emissions of less than 700 Hz bandwidth can’t exceed -74 dBW, averaged over 20 milliseconds, in 1587.42-1605 MHz band. (3) Uplink frequencies at 1610-1660.5 MHz can’t exceed -70 dBW/MHz in 1559-1605 MHz band. Discrete emissions under 700 Hz are restricted to -80 dBW, averaged over 20 milliseconds in 1559-1605 MHz. (4) Beginning Jan. 1, 2005, density of MES emissions at 1610-1660.5 MHz (except Standard A Inmarsat terminals used as Global Maritime Distress and Safety System ship earth stations) can’t exceed -70 dBW/MHz in 1559-1605 MHz band or level in 1605-1610 MHz determined by linear interpolation from -70 dBW/MHz at 1605 MHz to -10 dBW/MHz at 1610, and EIRP of discrete emissions of less than 700 Hz bandwidth from MES can’t exceed -80 dBW in 1559-1605.