|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.
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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
CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION
PART 15_RADIO FREQUENCY DEVICES--Table of Contents
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.