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FCC Part 15 Radio Frequency Devices
Section 15.209

The Federal Communications Commission (FCC) is the authority in the United States of America that creates and enforces the use of airwaves throughout the entire radio frequency spectrum. This group of documents contains the entirety of the FCC Part 15 regulations that concern unlicensed radio frequency devices. As with all government documents, this material is in the public domain and may be freely copied so long as the content is not changed. This copy is provided as a convenience for RF Cafe visitors. 

Click here for the Table of Contents.

[Code of Federal Regulations]
[Title 47, Volume 1]
[Revised as of October 1, 2008]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR15.209]
[Page 805-806]
                       TITLE 47--TELECOMMUNICATION
                     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:
         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., Sec. Sec. 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 
    (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 Sec. Sec. 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 
[[Page 806]]
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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