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FCC Part 15 Radio Frequency Devices
Section 15.245

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: 47CFR15.245]
[Page 818]
                       TITLE 47--TELECOMMUNICATION
                     Subpart C_Intentional Radiators
Sec. 15.245  Operation within the bands 902-928 MHz, 2435-2465 MHz,
5785-5815 MHz, 10500-10550 MHz, and 24075-24175 MHz.
    (a) Operation under the provisions of this section is limited to 
intentional radiators used as field disturbance sensors, excluding 
perimeter protection systems.
    (b) 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 (MHz)           fundamental    harmonics
                                              (millivolts/  (millivolts/
                                                 meter)        meter)
902-928.....................................           500           1.6
2435-2465...................................           500           1.6
5785-5815...................................           500           1.6
10500-10550.................................          2500          25.0
24075-24175.................................          2500          25.0
    (1) Regardless of the limits shown in the above table, harmonic 
emissions in the restricted bands below 17.7 GHz, as specified in Sec. 
15.205, shall not exceed the field strength limits shown in Sec. 
15.209. Harmonic emissions in the restricted bands at and above 17.7 GHz 
shall not exceed the following field strength limits:
    (i) For the second and third harmonics of field disturbance sensors 
operating in the 24075-24175 MHz band and for other field disturbance 
sensors designed for use only within a building or to open building 
doors, 25.0 mV/m.
    (ii) For all other field disturbance sensors, 7.5 mV/m.
    (iii) Field disturbance sensors designed to be used in motor 
vehicles or aircraft must include features to prevent continuous 
operation unless their emissions in the restricted bands, other than the 
second and third harmonics from devices operating in the 24075-24175 MHz 
band, fully comply with the limits given in Sec. 15.209. Continuous 
operation of field disturbance sensors designed to be used in farm 
equipment, vehicles such as fork lifts that are intended primarily for 
use indoors or for very specialized operations, or railroad locomotives, 
railroad cars and other equipment which travels on fixed tracks is 
permitted. A field disturbance sensor will be considered not to be 
operating in a continuous mode if its operation is limited to specific 
activities of limited duration (e.g., putting a vehicle into reverse 
gear, activating a turn signal, etc.).
    (2) Field strength limits are specified at a distance of 3 meters.
    (3) 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.
    (4) The emission limits shown above are based on measurement 
instrumentation employing an average detector. The provisions in Sec. 
15.35 for limiting peak emissions apply.
[54 FR 17714, Apr. 25, 1989, as amended at 55 FR 46792, Nov. 7, 1990; 61 
FR 42558, Aug. 16, 1996; 68 FR 68547, Dec. 9, 2003]

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