[Code of Federal Regulations]
[Title 47, Volume 2]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR25.138]
[Page 290-292]
TITLE 47--TELECOMMUNICATION
CHAPTER I--FEDERAL COMMUNICATIONS
COMMISSION (CONTINUED)
PART 25_SATELLITE COMMUNICATIONS--Table of Contents
Subpart B_Applications and Licenses
Sec. 25.138 Blanket Licensing provisions of GSO FSS Earth Stations in
the 18.3-18.8 GHz (space-to-Earth), 19.7-20.2 GHz (space-to-Earth),
28.35-28.6 GHz (Earth-to-space), and 29.25-30.0 GHz (Earth-to-space) bands.
(a) All applications for a blanket earth station license in the GSO
FSS in the 18.3-18.8 GHz, 19.7-20.2 GHz, 28.35-28.6 GHz, and 29.25-30.0
GHz bands that meet the following requirements shall be routinely
processed:
(1) GSO FSS earth station antenna off-axis EIRP spectral density for
co-polarized signals shall not exceed the following values, within
3[deg] of the GSO arc, under clear sky conditions:
18.5-25log([thetas])-10log(N dBW/40kHz........... for 2.0[deg] <=
). [thetas] <= 7[deg]
-2.63-10log(N).............. dBW/40kHz........... for 7[deg] <=
[thetas] <=
9.23[deg]
21.5-25log([thetas])-10log(N dBW/40kHz........... for 9.23[deg] <=
). [thetas] <= 48[deg]
-10.5-10log(N).............. dBW/40kHz........... for 48[deg] <
[thetas] <=
180[deg]
Where:
[thetas] is the angle in degrees from the axis of the main lobe; for
systems where more than one earth station is expected to transmit
simultaneously in the same bandwidth, e.g., CDMA systems,
N is the likely maximum number of simultaneously transmitting co-
frequency earth stations in the receive beam of the satellite; N=1 for
TDMA and FDMA systems.
(2) GSO FSS 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[deg] of the GSO
arc, under clear sky conditions:
21.5-25log([thetas])-10log(N dBW/40kHz........... for 3.5[deg] <=
). [thetas] <= 7[deg]
0.37-10log(N)............... dBW/40kHz........... for 7[deg] <
[thetas] <=
9.23[deg]
24.5-25log([thetas])-10log(N dBW/40kHz........... for 9.23[deg] <
). [thetas] <= 48[deg]
-7.5-10log(N)............... dBW/40kHz........... for 48[deg] <
[thetas] <=
180[deg]
[[Page 291]]
Where:
[thetas]: is the angle in degrees from the axis of the main lobe; for
systems where more than one earth station is expected to transmit
simultaneously in the same bandwidth, e.g., CDMA systems.
N: is the likely maximum number of simultaneously transmitting co-
frequency earth stations in the receive beam of the satellite; N=1 for
TDMA and FDMA systems.
(3) The values given in paragraphs (a) (1) and (2) of this section
may be exceeded by 3 dB, for values of [thetas] 10[deg],
provided that the total angular range over which this occurs does not
exceed 20[deg] when measured along both sides of the GSO arc.
(4) GSO FSS earth station antenna off-axis EIRP spectral density for
cross-polarized signals shall not exceed the following values, in all
directions relative to the GSO arc, under clear sky conditions:
8.5-25log([thetas])-10log(N) dBW/40kHz........... for 2.0[deg] <=
[thetas] <= 7[deg]
12.63-10log(N).............. dBW/40kHz........... for 7[deg] <
[thetas] <=
9.23[deg]
Where:
[thetas]: is the angle in degrees from the axis of the main lobe; for
systems where more than one earth station is expected to transmit
simultaneously in the same bandwidth, e.g., CDMA systems.
N: is the likely maximum number of simultaneously transmitting co-
frequency earth stations in the receive beam of the satellite; N=1 for
TDMA and FDMA systems.
(5) For earth stations employing uplink power control, the values in
paragraphs (a) (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.
(6) Power flux-density (PFD) at the Earth's surface produced by
emissions from a space station for all conditions, including clear sky,
and for all methods of modulation shall not exceed a level of -118 dBW/
m\2\/MHz, in addition to the limits specified in Sec. 25.208 (d).
(b) Each applicant for earth station license(s) that proposes levels
in excess of those defined in paragraph (a) of this section shall 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. Applicants shall also 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. Applicants shall
certify that all potentially affected parties (i.e., those GSO FSS
satellite networks that are 2, 4, and 6 degrees apart) acknowledge and
do not object to the use of the applicant's higher power densities.
(c) Licensees authorized pursuant to paragraph (b) of this section
shall bear the burden of coordinating with any future applicants or
licensees whose proposed compliant operations at 6 degrees or smaller
orbital spacing, as defined by paragraph (a) 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 and space
station power density levels to be compliant with those specified in
paragraph (a) of this section.
(d) The applicant shall provide for each earth station antenna type,
a series of radiation patterns measured on a production antenna
performed on a calibrated antenna range and, as a minimum, shall be made
at the bottom, middle, and top frequencies of the 30 GHz band. The
radiation patterns are:
[[Page 292]]
(1) Co-polarized patterns for each of two orthogonal senses of
polarizations in two orthogonal planes of the antenna.
(i) In the azimuth plane, plus and minus 10 degrees and plus and
minus 180 degrees.
(ii) In the elevation plane, zero to 30 degrees.
(2) Cross-polarization patterns in the E- and H-planes, plus and
minus 10 degrees.
(3) Main beam gain.
(e) Protection of receive earth stations from adjacent satellite
interference is based on either the antenna performance specified in
Sec. 25.209 (a) and (b), or the actual receiving earth station antenna
performance, if actual performance provides greater isolation from
adjacent satellite interference. For purposes of insuring the correct
level of protection, the applicant shall provide, for each earth station
antenna type, the antenna performance plots for the 20 GHz band,
including the format specified in paragraph (d) of this section.
(f) The earth station licensee shall not transmit towards a GSO FSS
satellite unless it has prior authorization from the satellite operator
or a space segment vendor authorized by the satellite operator. The
specific transmission shall be conducted in accordance with the
operating protocol specified by the satellite operator. The holder of an
FCC blanket license pursuant to this section shall be responsible for
operation of any transceiver to receive GSO FSS service provided by that
licensee or provided by another party with the blanket licensee's
consent. Operators of GSO FSS systems shall not transmit communications
to or from user transceivers in the United States unless such
communications are authorized under a service contract with the holder
of a pertinent FCC blanket license or under a service contract with
another party with authority for such transceiver operation delegated by
such a blanket licensee.
(g) A licensee applying to renew its license must include on FCC
Form 405 the number of constructed earth stations.
[65 FR 54169, Sept. 7, 2000, as amended at 66 FR 63515, Dec. 7, 2001; 68
FR 16966, Apr. 8, 2003; 69 FR 5710, Feb. 6, 2004]