Goto Section: 25.129 | 25.133 | Table of Contents
Revised as of October 20, 2020
Goto Year:2020 |
§ 25.132 Verification of earth station antenna performance.
(a)(1) Except as provided in paragraph (a)(2) of this section,
applications for transmitting earth stations in the FSS, including
feeder-link stations, must include a certification that the applicant
has reviewed the results of a series of radiation pattern tests
performed by the antenna manufacturer on representative equipment in
representative configurations, and the test results demonstrate that
the equipment meets relevant off-axis gain standards in § 25.209,
measured in accordance with paragraph (b)(1) of this section.
Applicants and licensees must be prepared to submit the radiation
pattern measurements to the Commission on request.
(2) Applicants that specify off-axis EIRP density pursuant to
§ 25.115(g)(1) are exempt from the certification requirement in
paragraph (a)(1) of this section.
(b)(1) For purposes of paragraph (a)(1) of this section and
§ 25.115(g)(1), the following measurements on a production antenna
performed on calibrated antenna range must be made at the top and
bottom of each frequency band assigned for uplink transmission:
(i)(A) Co-polarized gain in the azimuth plane must be measured across a
range extending to 180Â° on each side of the main-lobe axis, and the
measurements must be represented in two plots: one across the entire
angular range of Â±180Â° from the main-lobe axis and the other across
Â±10Â° from the main-lobe axis.
(B) Co-polarized gain must be measured from 0Â° to 30Â° from beam peak in
the elevation plane.
(ii) Cross-polarization gain must be measured across a range of plus
and minus 7Â° from beam peak in the azimuth and elevation planes.
(iii) Main beam gain.
(iv) For antennas with asymmetric apertures or beams, where the minor
axis of the antenna beam (major axis of the antenna aperture) will not
always be aligned parallel to the plane tangent to the GSO arc, the
measurements in paragraphs (b)(1)(i) through (iii) of this section must
be made over the angular ranges specified in paragraphs (b)(1)(i)(A)
and (B) of this section in two orthogonal planes, with the antenna
oriented at the maximum skew angle at which it will operate.
(2) The relevant envelope specified in § 25.209 must be superimposed on
each measured pattern.
(c) The tests specified in paragraph (b) of this section are normally
performed at the manufacturer's facility; but for those antennas that
are very large and only assembled on-site, on-site measurements may be
used for product qualification data. If on-site data is to be used for
qualification, the test frequencies and number of patterns should
follow, where possible, the recommendations in paragraph (b) of this
section, and the test data is to be submitted in the same manner as
described in paragraph (a) of this section.
(d) For each new or modified transmitting antenna over 3 meters in
diameter, the following on-site verification measurements must be
completed at one frequency on an available transponder in each
frequency band of interest and submitted to the Commission.
(1) Co-polarized patterns in the elevation plane, plus and minus 7
degrees, in the transmit band.
(2) Co-polarized patterns in the azimuth and elevation planes, plus and
minus 7 degrees, in the receive band.
(3) System cross-polarization discrimination on-axis. The FCC envelope
specified in § 25.209 shall be superimposed on each pattern. The
transmit patterns are to be measured with the aid of a co-operating
earth station in coordination with the satellite system control center
under the provisions of § 25.272.
(e) Certification that the tests required by paragraph (c) of this
section have been satisfactorily performed shall be provided to the
Commission in notification that construction of the facilities has been
completed as required by § 25.133.
(f) Antennas less than 3 meters in diameter and antennas on simple
(manual) drive mounts that are operated at a fixed site are exempt from
the requirements of paragraphs (c) and (d) of this section provided
that a detailed technical showing is made that confirms proper
installation, pointing procedures, and polarization alignment and
manufacturing quality control. These showing must also include a plan
for periodic testing and field installation procedures and precautions.
(g) Records of the results of the tests required by this section must
be maintained at the antenna site or the earth station operator's
control center and be available for inspection.
[ 58 FR 13419 , Mar. 11, 1993, as amended at 69 FR 5710 , Feb. 6, 2004; 70 FR 32253 , June 2, 2005; 72 FR 50028 , Aug. 29, 2007; 74 FR 47102 , Sept.
15, 2009; 74 FR 57098 , Nov. 4, 2009; 78 FR 14926 , Mar. 8, 2013; 79 FR 8318 , Feb. 12, 2014; 81 FR 55330 , Aug. 18, 2016; 84 FR 53654 , Oct. 8,
Goto Section: 25.129 | 25.133
Goto Year: 2020 |
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