§ 15.253 - [Reserved]

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

Cross Reference

Link to an amendment published at 82 FR 43870, September 20, 2017.

(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

[Reserved]