§  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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