§ 15.253   Operation within the bands 46.7-46.9 GHz and 76.0-77.0 GHz.

   (a) Operation within the band 46.7-46.9 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 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/cm2 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 µW/cm2 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 µW/cm2 at a
   distance of 3 meters from the exterior surface of the radiating structure.

   (4) The provisions in § 15.35 limiting peak emissions apply.

   (c) Operation within the band 76.0-77.0 GHz is restricted to vehicle-mounted
   field disturbance sensors used as vehicle radar systems and to fixed radar
   systems used at airport locations for foreign object debris detection on
   runways and for monitoring aircraft as well as service vehicles on taxiways
   and other airport vehicle service areas that have no public vehicle access.
   The transmission of additional information, such as data, is permitted
   provided the primary mode of operation is as a field disturbance sensor.
   Operation under the provisions of this section is not permitted on aircraft
   or satellites.

   (d)  The radiated emission limits within the band 76.0-77.0 GHz are as
   follows:

   (1) The average power density of any emission within the bands specified in
   this section shall not exceed 88 µW/cm2 at a distance of 3 meters from the
   exterior surface of the radiating structure (average EIRP of 50 dBm).

   (2) The peak power density of any emission within the band 76-77 GHz shall
   not exceed 279 µW/cm2 at a distance of 3 meters from the exterior surface of
   the radiating structure (peak EIRP of 55 dBm).

   (e) 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
   § 15.209.

   (2) Radiated emissions outside the operating band and between 40 GHz and 200
   GHz shall not exceed the following:

   (i) For field disturbance sensors operating in the band 46.7-46.9 GHz: 2
   pW/cm2 at a distance of 3 meters from the exterior surface of the radiating
   structure.

   (ii) For field disturbance sensors operating in the band 76-77 GHz: 600
   pW/cm2 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/cm2 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.

   (f) 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.

   (g) 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 § § 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.

   [ 77 FR 48102 , Aug. 13, 2012]

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