§  95.3379   76-81 GHz Band Radar Service unwanted emissions limits.

   (a) The power density of any emissions outside the 76-81 GHz band shall
   consist solely of spurious emissions and shall not exceed the
   following:

   (1) Radiated emissions below 40 GHz shall not exceed the field strength
   as shown in the following emissions table.
   Frequency
   (MHz) Field strength
   (microvolts/meter) Measurement distance
   (meters)
                      0.009-0.490          2400/F(kHz) 300
                      0.490-1.705         24000/F(kHz)  30
                      1.705-30.0                    30  30
                      30-88                        100   3
                      88-216                       150   3
                      216-960                      200   3
                      Above 960                    500   3

   (i) In the emissions table in paragraph (a)(1) of this section, the
   tighter limit applies at the band edges.

   (ii) The limits in the table in paragraph (a)(1) of this section are
   based on the frequency of the unwanted emissions and not the
   fundamental frequency. However, the level of any unwanted emissions
   shall not exceed the level of the fundamental frequency.

   (iii) The emissions limits shown in the table in paragraph (a)(1) of
   this section are based on measurements employing a CISPR quasi-peak
   detector except for the frequency bands 9.0-90.0 kHz, 110.0-490.0 kHz,
   and above 1000 MHz. Radiated emissions limits in these three bands are
   based on measurements employing an average detector with a 1 MHz RBW.

   (2) The power density of radiated emissions outside the 76-81 GHz band
   above 40.0 GHz shall not exceed the following, based on measurements
   employing an average detector with a 1 MHz RBW:

   (i) For radiated emissions outside the 76-81 GHz band between 40 GHz
   and 200 GHz from field disturbance sensors and radar systems operating
   in the 76-81 GHz band: 600 pW/cm2 at a distance of 3 meters from the
   exterior surface of the radiating structure.

   (ii) For radiated emissions above 200 GHz from field disturbance
   sensors and radar systems operating in the 76-81 GHz band: 1000 pW/cm2
   at a distance of 3 meters from the exterior surface of the radiating
   structure.

   (3) For field disturbance sensors and radar systems operating in the
   76-81 GHz band, the spectrum shall be investigated up to 231.0 GHz.

   (b) 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.