Goto Section: 78.104 | 78.106 | Table of Contents
FCC 78.105
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 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.
Antenna Standards
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 decibels
5° to 10° 10° to 15° 15° to 20° 20° to 30° 30° to 100° 100° to 140° 140° to
180°
12,700 to 13,250 A
B 1.0
2.0 n/a
n/a 23
20 28
25 35
28 39
30 41
32 42
37 50
47
17,700 to 19,700 A
B 2.2
2.2 38
38 25
20 29
24 33
28 36
32 42
35 55
36 55
36
^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
elevation planes.
(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
interference, and
(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]
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Goto Section: 78.104 | 78.106
Goto Year: 2014 |
2016
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