Goto Section: 73.1670 | 73.1680 | Table of Contents
Revised as of November 25, 2020
Goto Year:2020 |
§ 73.1675 Auxiliary antennas.
(a)(1) An auxiliary antenna is one that is permanently installed and
available for use when the main antenna is out of service for repairs
or replacement. An auxiliary antenna may be located at the same
transmitter site as the station's main antenna or at a separate site.
The service contour of the auxiliary antenna may not extend beyond the
following corresponding contour for the main facility:
(i) AM stations: The 0.5 mV/m field strength contours.
(ii) FM stations: The 1.0 mV/m field strength contours.
(iii) TV stations: The Grade B coverage contours.
(iv) Class A TV stations: The protected contours defined in § 73.6010.
(2) An application for an auxiliary antenna for an AM station filed
pursuant to paragraphs (b) or (c) of this section must contain a map
showing the 0.5 mV/m field strength contours of both the main and
(b) An application for a construction permit to install a new auxiliary
antenna, or to make changes in an existing auxiliary antenna for which
prior FCC authorization is required (see § 73.1690), must be filed on
FCC Form 301 (FCC Form 340 for noncommercial educational stations).
(c)(1) Where an FM, TV or Class A TV licensee proposes to use a
formerly licensed main facility as an auxiliary facility, or proposes
to modify a presently authorized auxiliary facility, and no changes in
the height of the antenna radiation center are required in excess of
the limits in § 73.1690(c)(1), the FM, TV or Class A TV licensee may
apply for the proposed auxiliary facility by filing a modification of
license application. The modified auxiliary facility must operate on
the same channel as the licensed main facility. An exhibit must be
provided with this license application to demonstrate compliance with
§ 73.1675(a). All FM, TV and Class A TV licensees may request a decrease
from the authorized facility's ERP in the license application. An FM,
TV or Class A TV licensee may also increase the ERP of the auxiliary
facility in a license modification application, provided the
application contains an analysis demonstrating compliance with the
Commission's radiofrequency radiation guidelines, and an analysis
showing that the auxiliary facility will comply with § 73.1675(a). Where
an FM, TV, or Class A TV licensee or permittee proposes to mount an
auxiliary facility on an AM tower, it must also demonstrate compliance
with § 1.30003 in the license application.
(2) Where an AM licensee proposes to use a former licensed main
facility as an auxiliary facility with an ERP less than or equal to the
ERP specified on the former main license, the AM station may apply to
license the proposed auxiliary facility by filing a modification of
license application on Form 302-AM. The proposed auxiliary facilities
must have been previously licensed on the same frequency as the present
main facility. The license application must contain an exhibit to
demonstrate compliance with § 73.1675(a).
[ 43 FR 53741 , Nov. 17, 1978, as amended at 44 FR 22740 , Apr. 17, 1979;
45 FR 26066 , Apr. 17, 1980; 50 FR 13974 , Apr. 9, 1985; 62 FR 51060 ,
Sept. 30, 1997; 63 FR 70049 , Dec. 18, 1998; 65 FR 30005 , May 10, 2000;
78 FR 66298 , Nov. 5, 2013]
Goto Section: 73.1670 | 73.1680
Goto Year: 2020 |
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