[Code of Federal Regulations]
[Title 47, Volume 1, Parts 0 to 19]
[Revised as of October 1, 1999]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR15.209]
[Page 695]
TITLE 47--TELECOMMUNICATION
CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION
PART 15--RADIO FREQUENCY DEVICES--Table of Contents
Subpart C--Intentional Radiators
Sec. 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:
------------------------------------------------------------------------
Measurement
Frequency (MHz) Field strength distance
(microvolts/meter) (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., Secs. 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 Secs. 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 Sec. 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 Sec. 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 Sec. 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 Sec. 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]