Goto Section: 17.32 | 17.35 | Table of Contents
FCC 17.33
Revised as of October 1, 2011
Goto Year:2010 |
2012
§ 15.33 Frequency range of radiated measurements.
(a) For an intentional radiator, the spectrum shall be investigated
from the lowest radio frequency signal generated in the device, without
going below 9 kHz, up to at least the frequency shown in this
paragraph:
(1) If the intentional radiator operates below 10 GHz: to the tenth
harmonic of the highest fundamental frequency or to 40 GHz, whichever
is lower.
(2) If the intentional radiator operates at or above 10 GHz and below
30 GHz: to the fifth harmonic of the highest fundamental frequency or
to 100 GHz, whichever is lower.
(3) If the intentional radiator operates at or above 30 GHz: to the
fifth harmonic of the highest fundamental frequency or to 200 GHz,
whichever is lower, unless specified otherwise elsewhere in the rules.
(4) If the intentional radiator contains a digital device, regardless
of whether this digital device controls the functions of the
intentional radiator or the digital device is used for additional
control or function purposes other than to enable the operation of the
intentional radiator, the frequency range shall be investigated up to
the range specified in paragraphs (a)(1) through (a)(3) of this section
or the range applicable to the digital device, as shown in paragraph
(b)(1) of this section, whichever is the higher frequency range of
investigation.
(b) For unintentional radiators:
(1) Except as otherwise indicated in paragraphs (b)(2) or (b)(3) of
this section, for an unintentional radiator, including a digital
device, the spectrum shall be investigated from the lowest radio
frequency signal generated or used in the device, without going below
the lowest frequency for which a radiated emission limit is specified,
up to the frequency shown in the following table:
Highest frequency generated or used in the device or on which the
device operates or tunes (MHz) Upper frequency of measurement range
(MHz)
Below 1.705 30.
1.705-108 1000.
108-500 2000.
500-1000 5000.
Above 1000 5th harmonic of the highest frequency or 40 GHz, whichever
is lower.
(2) A unintentional radiator, excluding a digital device, in which the
highest frequency generated in the device, the highest frequency used
in the device and the highest frequency on which the device operates or
tunes are less than 30 MHz and which, in accordance with § 15.109, is
required to comply with standards on the level of radiated emissions
within the frequency range 9 kHz to 30 MHz, such as a CB receiver or a
device designed to conduct its radio frequency emissions via connecting
wires or cables, e.g., a carrier current system not intended to
radiate, shall be investigated from the lowest radio frequency
generated or used in the device, without going below 9 kHz (25 MHz for
CB receivers), up to the frequency shown in the following table. If the
unintentional radiator contains a digital device, the upper frequency
to be investigated shall be that shown in the table below or in the
table in paragraph (b)(1) of this section, as based on both the highest
frequency generated and the highest frequency used in the digital
device, whichever range is higher.
Highest frequency generated or used in the device or on which the
device operates or tunes (MHz) Upper frequency of measurement range
(MHz)
Below 1.705 30
1.705-10 400
10-30 500
(3) Except for a CB receiver, a receiver employing superheterodyne
techniques shall be investigated from 30 MHz up to at least the second
harmonic of the highest local oscillator frequency generated in the
device. If such receiver is controlled by a digital device, the
frequency range shall be investigated up to the higher of the second
harmonic of the highest local oscillator frequency generated in the
device or the upper frequency of the measurement range specified for
the digital device in paragraph (b)(1) of this section.
(c) The above specified frequency ranges of measurements apply to the
measurement of radiated emissions and, in the case of receivers, the
measurement to demonstrate compliance with the antenna conduction
limits specified in § 15.111. The frequency range of measurements for
AC power line conducted limits is specified in § § 15.107 and 15.207
and applies to all equipment subject to those regulations. In some
cases, depending on the frequency(ies) generated and used by the
equipment, only signals conducted onto the AC power lines are required
to be measured.
(d) Particular attention should be paid to harmonics and subharmonics
of the fundamental frequency as well as to those frequencies removed
from the fundamental by multiples of the oscillator frequency.
Radiation at the frequencies of multiplier states should also be
checked.
[ 54 FR 17714 , Apr. 25, 1989, as amended at 61 FR 14502 , Apr. 2, 1996;
63 FR 42278 , Aug. 7, 1998]
Goto Section: 17.32 | 17.35
Goto Year: 2010 |
2012
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