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FCC Part 15 Radio Frequency Devices
Section 15.253

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: 47CFR15.253]
[Page 826-827]
 
                       TITLE 47--TELECOMMUNICATION
 
              CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION
 
PART 15_RADIO FREQUENCY DEVICES--Table of Contents
 
                     Subpart C_Intentional Radiators
 
Sec. 15.253  Operation within the bands 46.7-46.9 GHz and 76.0-77.0 GHz.
    (a) Operation within the bands 46.7-46.9 GHz and 76.0-77.0 GHz is 
restricted to vehicle-mounted field disturbance sensors used as vehicle 
radar systems. The transmission of additional information, such as data, 
is permitted provided the primary mode of operation is
[[Page 827]]
as a vehicle-mounted field disturbance sensor. Operation under the 
provisions of this section is not permitted on aircraft or satellites.
    (b) The radiated emission limits within the bands 46.7-46.9 GHz and 
76.0-77.0 GHz are as follows:
    (1) If the vehicle is not in motion, the power density of any 
emission within the bands specified in this section shall not exceed 200 
nW/cm \2\ at a distance of 3 meters from the exterior surface of the 
radiating structure.
    (2) For forward-looking vehicle-mounted field disturbance sensors, 
if the vehicle is in motion the power density of any emission within the 
bands specified in this section shall not exceed 60 [mu]W/cm \2\ at a 
distance of 3 meters from the exterior surface of the radiating 
structure.
    (3) For side-looking or rear-looking vehicle-mounted field 
disturbance sensors, if the vehicle is in motion the power density of 
any emission within the bands specified in this section shall not exceed 
30 [mu]W/cm \2\ at a distance of 3 meters from the exterior surface of 
the radiating structure.
    (c) The power density of any emissions outside the operating band 
shall consist solely of spurious emissions and shall not exceed the 
following:
    (1) Radiated emissions below 40 GHz shall not exceed the general 
limits in Sec. 15.209.
    (2) Radiated emissions outside the operating band and between 40 GHz 
and 200 GHz shall not exceed the following:
    (i) For vehicle-mounted field disturbance sensors operating in the 
band 46.7-46.9 GHz: 2 pW/cm\2\ at a distance of 3 meters from the 
exterior surface of the radiating structure.
    (ii) For forward-looking vehicle-mounted field disturbance sensors 
operating in the band 76-77 GHz: 600 pW/cm\2\ at a distance of 3 meters 
from the exterior surface of the radiating structure.
    (iii) For side-looking or rear-looking vehicle-mounted field 
disturbance sensors operating in the band 76-77 GHz: 300 pW/cm\2\ at a 
distance of 3 meters from the exterior surface of the radiating 
structure.
    (3) For radiated emissions above 200 GHz from field disturbance 
sensors operating in the 76-77 GHz band: the power density of any 
emission shall not exceed 1000 pW/cm\2\ at a distance of 3 meters from 
the exterior surface of the radiating structure.
    (4) For field disturbance sensors operating in the 76-77 GHz band, 
the spectrum shall be investigated up to 231 GHz.
    (d) The provisions in Sec. 15.35 limiting peak emissions apply.
    (e) Fundamental emissions must be contained within the frequency 
bands specified in this section during all conditions of operation. 
Equipment is presumed to operate over the temperature range -20 to +50 
degrees celsius with an input voltage variation of 85% to 115% of rated 
input voltage, unless justification is presented to demonstrate 
otherwise.
    (f) Regardless of the power density levels permitted under this 
section, devices operating under the provisions of this section are 
subject to the radiofrequency radiation exposure requirements specified 
in Sec. Sec. 1.1307(b), 2.1091 and 2.1093 of this chapter, as 
appropriate. Applications for equipment authorization of devices 
operating under this section must contain a statement confirming 
compliance with these requirements for both fundamental emissions and 
unwanted emissions. Technical information showing the basis for this 
statement must be submitted to the Commission upon request.
[61 FR 14503, Apr. 2, 1996, as amended at 61 FR 41018, Aug. 7, 1996; 63 
FR 42279, Aug. 7, 1998]



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