[Code of Federal Regulations]

[Title 47, Volume 1]

[Revised as of October 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 47CFR15.215]



[Page 886]

 

                       TITLE 47--TELECOMMUNICATION

 

              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. 

9, 2005]