Goto Section: 2.1051 | 2.1055 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 2.1053 Measurements required: Field strength of spurious radiation.
(a) Measurements shall be made to detect spurious emissions that may be
radiated directly from the cabinet, control circuits, power leads, or
intermediate circuit elements under normal conditions of installation
and operation. Curves or equivalent data shall be supplied showing the
magnitude of each harmonic and other spurious emission. For this test,
single sideband, independent sideband, and controlled carrier
transmitters shall be modulated under the conditions specified in
paragraph (c) of § 2.1049, as appropriate. For equipment operating on
frequencies below 890 MHz, an open field test is normally required,
with the measuring instrument antenna located in the far-field at all
test frequencies. In the event it is either impractical or impossible
to make open field measurements (e.g. a broadcast transmitter installed
in a building) measurements will be accepted of the equipment as
installed. Such measurements must be accompanied by a description of
the site where the measurements were made showing the location of any
possible source of reflections which might distort the field strength
measurements. Information submitted shall include the relative radiated
power of each spurious emission with reference to the rated power
output of the transmitter, assuming all emissions are radiated from
halfwave dipole antennas.
(b) The measurements specified in paragraph (a) of this section shall
be made for the following equipment:
(1) Those in which the spurious emissions are required to be 60 dB or
more below the mean power of the transmitter.
(2) All equipment operating on frequencies higher than 25 MHz.
(3) All equipment where the antenna is an integral part of, and
attached directly to the transmitter.
(4) Other types of equipment as required, when deemed necessary by the
[ 39 FR 5919 , Feb. 15, 1974. Redesignated and amended at 63 FR 36599 ,
July 7, 1998]
Goto Section: 2.1051 | 2.1055
Goto Year: 2020 |
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