Custom Search
Over 10000 Pages Indexed
Your Host
Click here to read about RF CafeKirt
Blattenberger

... single-
handedly
redefining
what an
engineering website
should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5CCG (5th MOB):
My USAF radar shop

Hobby & Fun

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse
riding business website -
lots of info

•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Job Board

About RF Cafe©

RF Cafe E-Mail

FCC Part 15 Radio Frequency Devices
Section 15.249

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
[CITE: 47CFR15.249]
[Page 822]
 
                       TITLE 47--TELECOMMUNICATION
 
              CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION
 
PART 15_RADIO FREQUENCY DEVICES--Table of Contents
 
                     Subpart C_Intentional Radiators
 
Sec. 15.249  Operation within the bands 902-928 MHz, 2400-2483.5 MHz,
5725-5875 MHZ, and 24.0-24.25 GHz.
    (a) Except as provided in paragraph (b) of this section, the field 
strength of emissions from intentional radiators operated within these 
frequency bands shall comply with the following:
------------------------------------------------------------------------
                                                  Field         Field
                                               strength of   strength of
            Fundamental frequency              fundamental    harmonics
                                              (millivolts/  (microvolts/
                                                 meter)        meter)
------------------------------------------------------------------------
902-928 MHz.................................            50           500
2400-2483.5 MHz.............................            50           500
5725-5875 MHz...............................            50           500
24.0-24.25 GHz..............................           250          2500
------------------------------------------------------------------------
    (b) Fixed, point-to-point operation as referred to in this paragraph 
shall be limited to systems employing a fixed transmitter transmitting 
to a fixed remote location. Point-to-multipoint systems, omnidirectional 
applications, and multiple co-located intentional radiators transmitting 
the same information are not allowed. Fixed, point-to-point operation is 
permitted in the 24.05-24.25 GHz band subject to the following 
conditions:
    (1) The field strength of emissions in this band shall not exceed 
2500 millivolts/meter.
    (2) The frequency tolerance of the carrier signal shall be 
maintained within 0.001% 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.
    (3) Antenna gain must be at least 33 dBi. Alternatively, the main 
lobe beamwidth must not exceed 3.5 degrees. The beamwidth limit shall 
apply to both the azimuth and elevation planes. At antenna gains over 33 
dBi or beamwidths narrower than 3.5 degrees, power must be reduced to 
ensure that the field strength does not exceed 2500 millivolts/meter.
    (c) Field strength limits are specified at a distance of 3 meters.
    (d) Emissions radiated outside of the specified frequency bands, 
except for harmonics, shall be attenuated by at least 50 dB below the 
level of the fundamental or to the general radiated emission limits in 
Sec. 15.209, whichever is the lesser attenuation.
    (e) As shown in Sec. 15.35(b), for frequencies above 1000 MHz, the 
field strength limits in paragraphs (a) and (b) of this section are 
based on average limits. However, the peak field strength of any 
emission shall not exceed the maximum permitted average limits specified 
above by more than 20 dB under any condition of modulation. For point-
to-point operation under paragraph (b) of this section, the peak field 
strength shall not exceed 2500 millivolts/meter at 3 meters along the 
antenna azimuth.
    (f) Parties considering the manufacture, importation, marketing or 
operation of equipment under this section should also note the 
requirement in Sec. 15.37(d).
[54 FR 17714, Apr. 25, 1989, as amended at 55 FR 25095, June 20, 1990; 
67 FR 1625, Jan. 14, 2002]



A Disruptive Web Presence

Custom Search
Over 10,000 pages indexed! (none duped or pirated)

Read About RF Cafe
Webmaster: Kirt Blattenberger
    KB3UON

RF Cafe Software

RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

RF & EE Symbols Word
RF Stencils for Visio

Product & Service Directory
Personally Selected Manufacturers
RF Cafe T-Shirts & Mugs

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel