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FCC Part 15 Radio Frequency Devices
Section 15.215

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: 47CFR15.215]
[Page 809]
                       TITLE 47--TELECOMMUNICATION
                     Subpart C_Intentional Radiators
Sec. 15.215  Additional provisions to the general radiated emission limitations.
    (a) The regulations in Sec. Sec. 15.217 through 15.257 provide 
alternatives to the general radiated emission limits for intentional 
radiators operating in specified frequency bands. Unless otherwise 
stated, there are no restrictions as to the types of operation permitted 
under these sections.
    (b) In most cases, unwanted emissions outside of the frequency bands 
shown in these alternative provisions must be attenuated to the emission 
limits shown in Sec. 15.209. In no case shall the level of the unwanted 
emissions from an intentional radiator operating under these additional 
provisions exceed the field strength of the fundamental emission.
    (c) Intentional radiators operating under the alternative provisions 
to the general emission limits, as contained in Sec. Sec. 15.217 
through 15.257 and in Subpart E of this part, must be designed to ensure 
that the 20 dB bandwidth of the emission, or whatever bandwidth may 
otherwise be specified in the specific rule section under which the 
equipment operates, is contained within the frequency band designated in 
the rule section under which the equipment is operated. The requirement 
to contain the designated bandwidth of the emission within the specified 
frequency band includes the effects from frequency sweeping, frequency 
hopping and other modulation techniques that may be employed as well as 
the frequency stability of the transmitter over expected variations in 
temperature and supply voltage. If a frequency stability is not 
specified in the regulations, it is recommended that the fundamental 
emission be kept within at least the central 80% of the permitted band 
in order to minimize the possibility of out-of-band operation.
[54 FR 17714, Apr. 25, 1989, as amended at 62 FR 45333, Aug. 27, 1997; 
67 FR 34855, May 16, 2002; 69 FR 3265, Jan. 23, 2004; 70 FR 6774, Feb. 
9, 2005]

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