[Code of Federal Regulations]

[Title 47, Volume 1]

[Revised as of October 1, 2005]

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

[CITE: 47CFR15.209]



[Page 816-817]

 

                       TITLE 47--TELECOMMUNICATION

 

              CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION

 

PART 15_RADIO FREQUENCY DEVICES--Table of Contents

 

                     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:



------------------------------------------------------------------------

                                                             Measurement

         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.





[[Page 817]]



    (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 

frequency.

    (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 

76-88 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]