Goto Section: 73.61 | 73.68 | Table of Contents
Revised as of October 1, 2020
Goto Year:2019 |
§ 73.62 Directional antenna system operation and tolerances.
(a) Each AM station operating a directional antenna must maintain the
relative amplitudes of the antenna currents, as indicated by the
antenna monitor, within 5% of the values specified on the instrument of
authorization. Directional antenna relative phases must be maintained
within 3 degrees of the values specified on the instrument of
(b) In the event of a failure of system components, improper pattern
switching or any other event that results in operation substantially at
variance from the radiation pattern specified in the instrument of
authorization for the pertinent time of day, operation must be
terminated within three minutes unless power can be reduced
sufficiently to eliminate any excessive radiation. See § 73.1350(e).
(1) Any variation of operating parameters by more than ±15 percent
sample current ratio or ±10 degrees in phase, any monitor point that
exceeds 125 percent of the licensed limit, or any operation at variance
that results in complaints of interference shall be considered
operation substantially at variance from the license and will require
immediate corrective action.
(c) In the event of minor variations of directional antenna operating
parameters from the tolerances specified in paragraph (a) of this
section, the following procedures will apply:
(1) The licensee shall measure and log every monitoring point at least
once for each mode of directional operation. Subsequent variations in
operating parameters will require the remeasuring and logging of every
monitoring point to assure that the authorized monitoring point limits
are not being exceeded. The licensee will be permitted 24 hours to
accomplish these actions; provided that, the date and time of the
failure to maintain proper operating parameters have been recorded in
the station log.
(2) Provided each monitoring point is within its specified limit,
operation may continue for a period up to 30 days before a request for
Special Temporary Authority (STA) must be filed, pursuant to paragraph
(c)(4) of this section, to operate with parameters at variance from the
provisions of paragraph (a) of this section.
(3) If any monitoring point exceeds its specified limit, the licensee
must either terminate operation within three hours or reduce power in
accordance with the applicable provisions of § 73.1350(d), in order to
eliminate any possibility of interference or excessive radiation in any
(4) If operation pursuant to paragraph (c)(3) of this section is
necessary, or before the 30-day period specified in paragraph (c)(2) of
this § expires, the licensee must request a Special Temporary Authority
(STA) in accordance with section 73.1635 to continue operation with
parameters at variance and/or with reduced power along with a statement
certifying that all monitoring points will be continuously maintained
within their specified limits.
(d) In any other situation in which it might reasonably be anticipated
that the operating parameters might vary out of tolerance (such as
planned array repairs or adjustment and proofing procedures), the
licensee shall, before such activity is undertaken, obtain a Special
Temporary Authority (STA) in accordance with § 73.1635 in order to
operate with parameters at variance and/or with reduced power as
required to maintain all monitoring points within their specified
[ 72 FR 44422 , Aug. 8, 2007]
Goto Section: 73.61 | 73.68
Goto Year: 2019 |
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