|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.
Click here for the
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. 15.235 Operation within the band 49.82-49.90 MHz.
(a) The field strength of any emission within this band shall not
exceed 10,000 microvolts/meter at 3 meters. The emission limit in this
paragraph is based on measurement instrumentation employing an average
detector. The provisions in Sec. 15.35 for limiting peak emissions
(b) The field strength of any emissions appearing between the band
edges and up to 10 kHz above and below the band edges shall be
attenuated at least 26 dB below the level of the unmodulated carrier or
to the general limits in Sec. 15.209, whichever permits the higher
emission levels. The field strength of any emissions removed by more
than 10 kHz from the band edges shall not exceed the general radiated
emission limits in Sec. 15.209. All signals exceeding 20 microvolts/
meter at 3 meters shall be reported in the application for
(c) For a home-built intentional radiator, as defined in Sec.
15.23(a), operating within the band 49.82-49.90 MHz, the following
standards may be employed:
(1) The RF carrier and modulation products shall be maintained
within the band 49.82-49.90 MHz.
(2) The total input power to the device measured at the battery or
the power line terminals shall not exceed 100 milliwatts under any
condition of modulation.
(3) The antenna shall be a single element, one meter or less in
length, permanently mounted on the enclosure containing the device.
(4) Emissions outside of this band shall be attenuated at least 20
dB below the level of the unmodulated carrier.
(5) The regulations contained in Sec. 15.23 of this part apply to
intentional radiators constructed under the provisions of this
(d) Cordless telephones are not permitted to operate under the
provisions of this section.