Goto Section: 25.137 | 25.139 | Table of Contents
FCC 25.138
Revised as of October 1, 2008
Goto Year:2007 |
2009
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 ° of
the GSO arc, under clear sky conditions:
18.5–25log(Θ)–10log(N) dBW/40kHz for 2.0 ° ≤ Θ ≤ 7 °
−2.63–10log(N) dBW/40kHz for 7 ° ≤ Θ ≤ 9.23 °
21.5–25log(Θ)–10log(N) dBW/40kHz for 9.23 ° ≤ Θ ≤ 48 °
−10.5–10log(N) dBW/40kHz for 48 ° < Θ ≤ 180 °
Where:
Θ 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 ° of the GSO arc, under clear sky conditions:
21.5–25log(Θ)–10log(N) dBW/40kHz for 3.5 ° ≤ Θ ≤ 7 °
0.37–10log(N) dBW/40kHz for 7 ° < Θ ≤ 9.23 °
24.5–25log(Θ)–10log(N) dBW/40kHz for 9.23 ° < Θ ≤ 48 °
−7.5–10log(N) dBW/40kHz for 48 ° < Θ ≤ 180 °
Where:
Θ: 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 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) 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(Θ)–10log(N) dBW/40kHz for 2.0 ° ≤ Θ ≤ 7 °
12.63–10log(N) dBW/40kHz for 7 ° < Θ ≤ 9.23 °
Where:
Θ: 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:
(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]
Goto Section: 25.137 | 25.139
Goto Year: 2007 |
2009
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