Goto Section: 15.207 | 15.211 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 15.209 Radiated emission limits; general requirements.
(a) Except as provided elsewhere in this subpart, the emissions from an
intentional radiator shall not exceed the field strength levels
specified in the following table:
Frequency (MHz) Field strength (microvolts/meter) Measurement distance
0.009-0.490 2400/F(kHz) 300
0.490-1.705 24000/F(kHz) 30
1.705-30.0 30 30
30-88 100** 3
88-216 150** 3
216-960 200** 3
Above 960 500 3
**Except as provided in paragraph (g), fundamental emissions from
intentional radiators operating under this section shall not be located
in the frequency bands 54-72 MHz, 76-88 MHz, 174-216 MHz or 470-806
MHz. However, operation within these frequency bands is permitted under
other sections of this part, e.g., § § 15.231 and 15.241.
(b) In the emission table above, the tighter limit applies at the band
(c) The level of any unwanted emissions from an intentional radiator
operating under these general provisions shall not exceed the level of
the fundamental emission. For intentional radiators which operate under
the provisions of other sections within this part and which are
required to reduce their unwanted emissions to the limits specified in
this table, the limits in this table are based on the frequency of the
unwanted emission and not the fundamental frequency. However, the level
of any unwanted emissions shall not exceed the level of the fundamental
(d) The emission limits shown in the above table are based on
measurements employing a CISPR quasi-peak detector except for the
frequency bands 9-90 kHz, 110-490 kHz and above 1000 MHz. Radiated
emission limits in these three bands are based on measurements
employing an average detector.
(e) The provisions in § § 15.31, 15.33, and 15.35 for measuring emissions
at distances other than the distances specified in the above table,
determining the frequency range over which radiated emissions are to be
measured, and limiting peak emissions apply to all devices operated
under this part.
(f) In accordance with § 15.33(a), in some cases the emissions from an
intentional radiator must be measured to beyond the tenth harmonic of
the highest fundamental frequency designed to be emitted by the
intentional radiator because of the incorporation of a digital device.
If measurements above the tenth harmonic are so required, the radiated
emissions above the tenth harmonic shall comply with the general
radiated emission limits applicable to the incorporated digital device,
as shown in § 15.109 and as based on the frequency of the emission being
measured, or, except for emissions contained in the restricted
frequency bands shown in § 15.205, the limit on spurious emissions
specified for the intentional radiator, whichever is the higher limit.
Emissions which must be measured above the tenth harmonic of the
highest fundamental frequency designed to be emitted by the intentional
radiator and which fall within the restricted bands shall comply with
the general radiated emission limits in § 15.109 that are applicable to
the incorporated digital device.
(g) Perimeter protection systems may operate in the 54-72 MHz and 76-88
MHz bands under the provisions of this section. The use of such
perimeter protection systems is limited to industrial, business and
[ 54 FR 17714 , Apr. 25, 1989; 54 FR 32339 , Aug. 7, 1989; 55 FR 18340 ,
May 2, 1990; 62 FR 58658 , Oct. 30, 1997]
Goto Section: 15.207 | 15.211
Goto Year: 2020 |
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