Goto Section: 15.219 | 15.223 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 15.221 Operation in the band 525-1705 kHz.
(a) Carrier current systems and transmitters employing a leaky coaxial
cable as the radiating antenna may operate in the band 525-1705 kHz
provided the field strength levels of the radiated emissions do not
exceed 15 uV/m, as measured at a distance of 47,715/(frequency in kHz)
meters (equivalent to Lambda/2Pi) from the electric power line or the
coaxial cable, respectively. The field strength levels of emissions
outside this band shall not exceed the general radiated emission limits
in § 15.209.
(b) As an alternative to the provisions in paragraph (a) of this
section, intentional radiators used for the operation of an AM
broadcast station on a college or university campus or on the campus of
any other education institution may comply with the following:
(1) On the campus, the field strength of emissions appearing outside of
this frequency band shall not exceed the general radiated emission
limits shown in § 15.209 as measured from the radiating source. There is
no limit on the field strength of emissions appearing within this
frequency band, except that the provisions of § 15.5 continue to comply.
(2) At the perimeter of the campus, the field strength of any
emissions, including those within the frequency band 525-1705 kHz,
shall not exceed the general radiated emission in § 15.209.
(3) The conducted limits specified in § 15.207 apply to the radio
frequency voltage on the public utility power lines outside of the
campus. Due to the large number of radio frequency devices which may be
used on the campus, contributing to the conducted emissions, as an
alternative to measuring conducted emissions outside of the campus, it
is acceptable to demonstrate compliance with this provision by
measuring each individual intentional radiator employed in the system
at the point where it connects to the AC power lines.
(c) A grant of equipment authorization is not required for intentional
radiators operated under the provisions of this section. In lieu
thereof, the intentional radiator shall be verified for compliance with
the regulations in accordance with subpart J of part 2 of this chapter.
This data shall be kept on file at the location of the studio, office
or control room associated with the transmitting equipment. In some
cases, this may correspond to the location of the transmitting
(d) For the band 535-1705 kHz, the frequency of operation shall be
chosen such that operation is not within the protected field strength
contours of licensed AM stations.
[ 56 FR 373 , Jan. 4, 1991]
Goto Section: 15.219 | 15.223
Goto Year: 2020 |
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