Sec.  25.216   Limits on emissions from mobile earth stations for protection of
aeronautical radionavigation-satellite service.

   (a) The e.i.r.p. density of emissions from mobile earth stations placed in
   service on or before July 21, 2002 with assigned uplink frequencies between
   1610 MHz and 1660.5 MHz shall not exceed −70 dBW/MHz, averaged over any 2
   millisecond active transmission interval, in the band 1559–1587.42 MHz. The
   e.i.r.p. of discrete emissions of less than 700 Hz bandwidth generated by
   such stations shall not exceed −80 dBW, averaged over any 2 millisecond
   active transmission interval, in that band.

   (b) The e.i.r.p. density of emissions from mobile earth stations placed in
   service on or before July 21, 2002 with assigned uplink frequencies between
   1610 MHz and 1626.5 MHz shall not exceed −64 dBW/MHz, averaged over any 2
   millisecond active transmission interval, in the band 1587.42–1605 MHz. The
   e.i.r.p. of discrete emissions of less than 700 Hz bandwidth generated by
   such stations shall not exceed −74 dBW, averaged over any 2 millisecond
   active transmission interval, in the 1587.42–1605 MHz band.

   (c) The e.i.r.p. density of emissions from mobile earth stations placed in
   service after July 21, 2002 with assigned uplink frequencies between 1610
   MHz and 1660.5 MHz shall not exceedq −70 dBW/MHz, averaged over any 2
   millisecond active transmission interval, in the band 1559–1605 MHz. The
   e.i.r.p. of discrete emissions of less than 700 Hz bandwidth from such
   stations shall not exceed −80 dBW, averaged over any 2 millisecond active
   transmission interval, in the 1559–1605 MHz band.

   (d) As of January 1, 2005, the e.i.r.p. density of emissions from mobile
   earth stations placed in service on or before July 21, 2002 with assigned
   uplink frequencies between 1610 MHz and 1660.5 MHz (except Standard A and B
   Inmarsat terminals used as Global Maritime Distress and Safety System ship
   earth stations) shall not exceed −70dBW/MHz, averaged over any 2 millisecond
   active transmission interval, in the 1559–1605 MHz band. The e.i.r.p. of
   discrete emissions of less than 700 Hz bandwidth from such stations shall
   not exceed −80 dBW, averaged over any 2 millisecond active transmission
   interval, in the 1559–1605 MHz band. Standard A Inmarsat terminals used as
   Global Maritime Distress and Safety System ship earth stations that do not
   meet the e.i.r.p. density limits specified in this paragraph may continue
   operation until December 31, 2007. Inmarsat-B terminals manufactured more
   than six months after Federal Register publication of the rule changes
   adopted in FCC 03–283 must meet these limits. Inmarsat B terminals
   manufactured before then are temporarily grandfathered under the condition
   that no interference is caused by these terminals to aeronautical satellite
   radio-navigation systems. The full-compliance deadline for grandfathered
   Inmarsat-B terminals is December 31, 2012.

   (e) The e.i.r.p density of emissions from mobile earth stations with
   assigned uplink frequencies between 1990 MHz and 2025 MHz shall not exceed
   −70 dBW/MHz, averaged over any 2 millisecond active transmission interval,
   in frequencies between 1559 MHz and 1610 MHz. The e.i.r.p. of discrete
   emissions of less than 700 Hz bandwidth from such stations between 1559 MHz
   and 1605 MHz shall not exceed −80 dBW, averaged over any 2 millisecond
   active transmission interval. The e.i.r.p. of discrete emissions of less
   than 700 Hz bandwidth from such stations between 1605 MHz and 1610 MHz
   manufactured more than six months after Federal Register publication of the
   rule changes adopted in FCC 03–283 shall not exceed −80 dBW, averaged over
   any 2 millisecond active transmission interval.

   (f) Mobile earth stations placed in service after July 21, 2002 with
   assigned uplink frequencies in the 1610–1660.5 MHz band shall suppress the
   power density of emissions in the 1605–1610 MHz band to an extent determined
   by linear interpolation from −70 dBW/MHz at 1605 MHz to −10 dBW/MHz at 1610
   MHz.

   (g) Mobile earth stations manufactured more than six months after Federal
   Register publication of the rule changes adopted in FCC 03–283 with assigned
   uplink frequencies in the 1610–1626.5 MHz band shall suppress the power
   density of emissions in the 1605–1610 MHz band-segment to an extent
   determined by linear interpolation from −70 dBW/MHz at 1605 MHz to −10
   dBW/MHz at 1610 MHz averaged over any 2 millisecond active transmission
   interval. The e.i.r.p of discrete emissions of less than 700 Hz bandwidth
   from such stations shall not exceed a level determined by linear
   interpolation from −80 dBW at 1605 MHz to −20 dBW at 1610 MHz, averaged over
   any 2 millisecond active transmission interval.

   (h) Mobile earth stations manufactured more than six months after Federal
   Register publication of the rule changes adopted in FCC 03–283 with assigned
   uplink frequencies in the 1626.5–1660.5 MHz band shall suppress the power
   density of emissions in the 1605–1610 MHz band-segment to an extent
   determined by linear interpolation from −70 dBW/MHz at 1605 MHz to −46
   dBW/MHz at 1610 MHz, averaged over any 2 millisecond active transmission
   interval. The e.i.r.p of discrete emissions of less than 700 Hz bandwidth
   from such stations shall not exceed a level determined by linear
   interpolation from −80 dBW at 1605 MHz to −56 dBW at 1610 MHz, averaged over
   any 2 millisecond active transmission interval.

   (i) The e.i.r.p density of carrier-off state emissions from mobile earth
   stations manufactured more than six months after Federal Register
   publication of the rule changes adopted in FCC 03–283 with assigned uplink
   frequencies between 1 and 3 GHz shall not exceed -80 dBW/MHz in the
   1559–1610 MHz band averaged over any two millisecond interval.

   (j) A Root-Mean-Square detector shall be used for all power density
   measurements.

   [ 69 FR 5710 , Feb. 6, 2004, as amended at  70 FR 19318 , Apr. 13, 2005]