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 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 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 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) 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.

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    (2) 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.
    (3) 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.
    (4) Radiated emissions below 40 GHz shall not exceed the general 
limits in Sec. 15.209.
    (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 Secs. 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]