|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. 15.229 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
(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]