Goto Section: 15.207 | 15.211 | Table of Contents
FCC 15.209
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 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
(meters)
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
edges.
(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 frequency.
(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 commercial
applications.
[ 54 FR 17714 , Apr. 25, 1989; 54 FR 32339 , Aug. 7, 1989; 55 FR 18340 , May 2,
1990; 62 FR 58658 , Oct. 30, 1997]
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Goto Section: 15.207 | 15.211
Goto Year: 2014 |
2016
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