Goto Section: 78.104 | 78.106 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 78.105 Antenna systems.
(a) For fixed stations operating in the 12.7-13.2 GHz and 17.7-19.7 GHz
bands, the following standards apply:
(1) Fixed CARS stations shall use directional antennas that meet the
performance standards indicated in the following table.
(i) Stations must employ an antenna that meets the performance
standards for Category B. In areas subject to frequency congestion,
where proposed facilities would be precluded by continued use of a
Category B antenna, a Category A antenna must be employed. The
Commission may require the use of a high performance antenna where
interference problems can be resolved by the use of such antennas.
(ii) Upon adequate showing of need to serve a larger sector, or more
than a single sector, greater beamwidth or multiple antennas may be
authorized. Applicants shall request and authorization for stations in
this service will specify the polarization of each transmitted signal.
(iii) Licensees shall comply with the antenna standards table shown in
this paragraph in the following manner:
(A) With either the maximum beamwidth to 3 dB points requirement or
with the minimum antenna gain requirement; and
(B) With the minimum radiation suppression to angle requirement.
Frequency (MHz) Category Maximum beamwidith to 3 dB points^1 (included
angle in degrees) Minimum antenna gain (dbi) Minimum radiation
suppression to angle in degrees from centerline of main beam in
5Â° to 10Â° 10Â° to 15Â° 15Â° to 20Â° 20Â° to 30Â° 30Â° to 100Â° 100Â° to 140Â°
140Â° to 180Â°
12,700 to 13,250 A
17,700 to 19,700 A
^1If a licensee chooses to show compliance using maximum beamwidth to 3
dB points, the beamwidth limit shall apply in both the azimuth and the
(2) New periscope antenna systems will be authorized upon a
certification that the radiation, in a horizontal plane, from an
illuminating antenna and reflector combination meets or exceeds the
antenna standards of this section. This provision similarly applies to
passive repeaters employed to redirect or repeat the signal from a
station's directional antenna system.
(3) The choice of receiving antennas is left to the discretion of the
licensee. However, licensees will not be protected from interference
which results from the use of antennas with poorer performance than
defined in paragraph (a) of this section.
(4) Pickup stations are not subject to the performance standards herein
stated. The provisions of this paragraph are effective for all new
applications accepted for filing after October 1, 1981.
(b) Any fixed station licensed pursuant to an application accepted for
filing prior to October 1, 1981, may continue to use its existing
antenna system, subject to periodic renewal until April 1, 1992, After
April 1, 1992, all licensees are to use antenna systems in conformance
with the standards of this section. TV auxiliary broadcast stations are
considered to be located in an area subject to frequency congestion and
must employ a Category A antenna when:
(1) A showing by an applicant of a new CAR service or TV auxiliary
broadcast, which shares the 12.7-13.20 GHz band with CARS, indicates
that use of a category B antenna limits a proposed project because of
(2) That use of a category A antenna will remedy the interference thus
allowing the project to be realized.
(c) As an exception to the provisions of this section, the FCC may
approve requests for use of periscope antenna systems where a
persuasive showing is made that no frequency conflicts exist in the
area of proposed use. Such approvals shall be conditioned to require
conversion to a standard antenna as required in paragraph (a) of this
section when an applicant of a new TV auxiliary broadcast or Cable
Television Relay station indicates that the use of the existing antenna
system will cause interference and the use of a category A or B antenna
will remedy the interference.
(d) As a further exception to the provision of paragraph (a) of this
section the Commission may approve antenna systems not conforming to
the technical standards where a persuasive showing is made that:
(1) Indicates in detail why an antenna system complying with the
requirements of paragraph (a) of this section cannot be installed, and
(2) Includes a statement indicating that frequency coordination as
required in § 78.18a was accomplished.
[ 45 FR 78694 , Nov. 26, 1980, as amended at 49 FR 37779 , Sept. 26, 1984;
50 FR 7343 , Feb. 22, 1985; 51 FR 19841 , June 3, 1986; 56 FR 50664 , Oct.
8, 1991; 62 FR 4923 , Feb. 3, 1997; 68 FR 12776 , Mar. 17, 2003]
Goto Section: 78.104 | 78.106
Goto Year: 2020 |
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