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FCC Part 15 Radio Frequency Devices
Section 15.515

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: 47CFR15.515]
[Page 843-844]
 
                       TITLE 47--TELECOMMUNICATION
 
              CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION
 
PART 15_RADIO FREQUENCY DEVICES--Table of Contents
 
                   Subpart F_Ultra-Wideband Operation
 
Sec. 15.515  Technical requirements for vehicular radar systems.
    (a) Operation under the provisions of this section is limited to UWB 
field disturbance sensors mounted in terrestrial transportation 
vehicles. These devices shall operate only when the vehicle is 
operating, e.g., the engine is running. Operation shall occur only upon 
specific activation, such as upon starting the vehicle, changing gears, 
or engaging a turn signal.
    (b) The UWB bandwidth of a vehicular radar system operating under 
the
[[Page 844]]
provisions of this section shall be contained between 22 GHz and 29 GHz. 
In addition, the center frequency, fC, and the frequency at 
which the highest level emission occurs, fM, must be greater 
than 24.075 GHz.
    (c) Following proper installation, vehicular radar systems shall 
attenuate any emissions within the 23.6-24.0 GHz band that appear 38 
degrees or greater above the horizontal plane by 25 dB below the limit 
specified in paragraph (d) of this section. For equipment authorized, 
manufactured or imported on or after January 1, 2005, this level of 
attenuation shall be 25 dB for any emissions within the 23.6-24.0 GHz 
band that appear 30 degrees or greater above the horizontal plane. For 
equipment authorized, manufactured or imported on or after January 1, 
2010, this level of attenuation shall be 30 dB for any emissions within 
the 23.6-24.0 GHz band that appear 30 degrees or greater above the 
horizontal plane. For equipment authorized, manufactured or imported on 
or after January 1, 2014, this level of attenuation shall be 35 dB for 
any emissions within the 23.6-24.0 GHz band that appear 30 degrees or 
greater above the horizontal plane. This level of attenuation can be 
achieved through the antenna directivity, through a reduction in output 
power or any other means.
    (d) The radiated emissions at or below 960 MHz from a device 
operating under the provisions of this section shall not exceed the 
emission levels in Sec. 15.209. The radiated emissions above 960 MHz 
from a device operating under the provisions of this section shall not 
exceed the following average limits when measured using a resolution 
bandwidth of 1 MHz:
------------------------------------------------------------------------
                   Frequency in MHz                       EIRP in dBm
------------------------------------------------------------------------
960-1610.............................................              -75.3
1610-22,000..........................................              -61.3
22,000-29,000........................................              -41.3
29,000-31,000........................................              -51.3
Above 31,000.........................................              -61.3
------------------------------------------------------------------------
    (e) In addition to the radiated emission limits specified in the 
table in paragraph (d) of this section, UWB transmitters operating under 
the provisions of this section shall not exceed the following average 
limits when measured using a resolution bandwidth of no less than 1 kHz:
------------------------------------------------------------------------
                   Frequency in MHz                       EIRP in dBm
------------------------------------------------------------------------
1164-1240............................................              -85.3
1559-1610............................................              -85.3
------------------------------------------------------------------------
    (f) There is a limit on the peak level of the emissions contained 
within a 50 MHz bandwidth centered on the frequency at which the highest 
radiated emission occurs, fM. That limit is 0 dBm EIRP. It is 
acceptable to employ a different resolution bandwidth, and a 
correspondingly different peak emission limit, following the procedures 
described in Sec. 15.521.
    (g) The emission levels from devices operating under the provisions 
of this section that employ gated transmissions may be measured with the 
gating active. Measurements made in this manner shall be repeated over 
multiple sweeps with the analyzer set for maximum hold until the 
amplitude stabilizes.
[67 FR 34856, May 16, 2002, as amended at 70 FR 6776, Feb. 9, 2005]



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