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FCC Part 15 Radio Frequency Devices
Section 15.229

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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[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: 47CFR15.229]
[Page 811]
                       TITLE 47--TELECOMMUNICATION
                     Subpart C_Intentional Radiators
Sec. 15.229  Operation within the band 40.66-40.70 MHz.
    (a) Unless operating pursuant to the provisions in Sec. 15.231, the 
field strength of any emissions within this band shall not exceed 1,000 
microvolts/meter at 3 meters.
    (b) As an alternative to the limit in paragraph (a) of this section, 
perimeter protection systems may demonstrate compliance with the 
following: the field strength of any emissions within this band shall 
not exceed 500 microvolts/meter at 3 meters, as determined using 
measurement instrumentations employing an average detector. The 
provisions in Sec. 15.35 for limiting peak emissions apply where 
compliance of these devices is demonstrated under this alternative 
emission limit.
    (c) The field strength of any emissions appearing outside of this 
band shall not exceed the general radiated emission limits in Sec. 
    (d) The frequency tolerance of the carrier signal shall be 
maintained within 0.01% of the operating frequency 
over a temperature variation of -20 degrees to +50 degrees C at normal 
supply voltage, and for a variation in the primary supply voltage from 
85% to 115% of the rated supply voltage at a temperature of 20 degrees 
C. For battery operated equipment, the equipment tests shall be 
performed using a new battery.
[54 FR 17714, Apr. 25, 1989, as amended at 55 FR 33910, Aug. 20, 1990]

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