§ 15.215   Additional provisions to the general radiated emission limitations.

   (a) The regulations in § § 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 § 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 § § 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. In the case of intentional radiators operating under
   the provisions of subpart E, the emission bandwidth may span across multiple
   contiguous frequency bands identified in that subpart. 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;  79 FR 24578 , May 1, 2014]

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