§  25.223   Off-axis EIRP spectral density limits for feeder link earth
stations in the 17/24 GHz BSS.

   (a) This section applies to all applications for earth station licenses
   in the 17/24 GHz BSS frequency bands, except for applications in which
   the proposed antenna does not conform to the standards of § § 25.209(a)
   and (b), and/or the proposed power density levels are in excess of
   those specified in § 25.212(f) of this part.

   (b) All applications for earth station licenses in the 24.75–25.25 GHz
   portion of 17/24 GHz BSS shall be routinely processed if they meet the
   following requirements:

   (1) 17/24 GHz BSS earth station antenna off-axis EIRP spectral density
   for co-polarized signals shall not exceed the following values, within
   ±3° of the GSO arc, under clear sky conditions:
   32.5–25log(Θ) dBW/MHz for 2° ≤ Θ ≤ 7°
   11.4          dBW/MHz for 7° ≤ Θ ≤ 9.2°
   35.5–25log(Θ) dBW/MHz for 9.2° ≤ Θ ≤ 48°
   3.5           dBW/MHz for 48° ≤ Θ ≤ 180°

   Where Θ is the angle in degrees from the axis of the main lobe.

   (2) 17/24 GHz BSS earth station antenna off-axis EIRP spectral density
   for co-polarized signals shall not exceed the following values, for all
   directions other than within ±3° of the GSO arc, under clear sky
   conditions:
   35.5–25log(Θ) dBW/MHz for 2° ≤ Θ ≤ 7°
   14.4          dBW/MHz for 7° ≤ Θ ≤ 9.2°
   38.5–25log(Θ) dBW/MHz for 9.2° ≤ Θ ≤ 48°
   6.5           dBW/MHz for 48° ≤ Θ ≤ 180°

   Where Θ is the angle in degrees from the axis of the main lobe.

   (3) The values given in paragraphs (b) (1) and (2) of this section may
   be exceeded by 3 dB, for values of Θ > 10°, provided that the total
   angular range over which this occurs does not exceed 20° when measured
   along both sides of the GSO arc.

   (4) 17/24 GHz BSS earth station antenna off-axis EIRP spectral density
   for cross-polarized signals shall not exceed the following values, in
   all directions greater than +3 relative to the GSO arc, under clear sky
   conditions:
   22.5–25log(Θ) dBW/MHz for 2° ≤ Θ ≤ 7°
   1.4           dBW/MHz for 7° ≤ Θ ≤ 9.2°

   Where is the angle in degrees from the axis of the main lobe.

   (c) Notwithstanding § 25.220 of this part, each applicant for earth
   station license(s) that proposes levels in excess of those defined in
   paragraph (b) of this section shall:

   (1) Submit link budget analyses of the operations proposed along with a
   detailed written explanation of how each uplink and each transmitted
   satellite carrier density figure is derived;

   (2) Submit a narrative summary which must indicate whether there are
   margin shortfalls in any of the current baseline services as a result
   of the addition of the applicant's higher power service, and if so, how
   the applicant intends to resolve those margin short falls;

   (3) Certify that all potentially affected parties acknowledge and do
   not object to the use of the applicant's higher power densities. For
   proposed power levels less than or equal to 3 dB in excess of the
   limits defined above, the affected parties shall be those co-frequency
   U.S. licensed 17/24 GHz BSS satellite networks that are located at
   angular separations of up to ±6° away; for power levels greater than 3
   dB and less than or equal to 6 dB in excess of the limits defined
   above, affected parties shall be all those co-frequency U.S. licensed
   operators at up to ±10° away. No power levels greater than 6 dB in
   excess of the limits defined above shall be permitted.

   (d) Licensees authorized pursuant to paragraph (c) of this section
   shall bear the burden of coordinating with any future applicants or
   licensees whose proposed compliant operations at 10 degrees or smaller
   orbital spacing, as defined by paragraph (b) of this section, is
   potentially or actually adversely affected by the operation of the
   non-compliant licensee. If no good faith agreement can be reached,
   however, the non-compliant licensee shall reduce its earth station EIRP
   spectral density levels to be compliant with those specified in
   paragraph (b) of this section.

   (e) For earth stations employing uplink power control, the values in
   paragraphs (b) (1), (2), and (4) of this section may be exceeded by up
   to 20 dB under conditions of uplink fading due to precipitation. The
   amount of such increase in excess of the actual amount of monitored
   excess attenuation over clear sky propagation conditions shall not
   exceed 1.5 dB or 15% of the actual amount of monitored excess
   attenuation in dB, whichever is larger, with a confidence level of 90
   percent except over transient periods accounting for no more than 0.5%
   of the time during which the excess is no more than 4.0 dB.

   [ 72 FR 50030 , Aug. 29, 2007]