§  15.257   Operation within the band 92-95 GHz.

   (a) Operation of devices under the provisions of this section is
   limited to indoor use;

   (1) Devices operating under the provisions of this section, by the
   nature of their design, must be capable of operation only indoors. The
   necessity to operate with a fixed indoor infrastructure, e.g., a
   transmitter that must be connected to the AC power lines, may be
   considered sufficient to demonstrate this.

   (2) The use of outdoor mounted antennas, e.g., antennas mounted on the
   outside of a building or on a telephone pole, or any other outdoors
   infrastructure is prohibited.

   (3) The emissions from equipment operated under this section shall not
   be intentionally directed outside of the building in which the
   equipment is located, such as through a window or a doorway.

   (4) Devices operating under the provisions of this section shall bear
   the following or similar statement in a conspicuous location on the
   device or in the instruction manual supplied with the device: “This
   equipment may only be operated indoors. Operation outdoors is in
   violation of 47 U.S.C. 301 and could subject the operator to serious
   legal penalties.”

   (b) Operation under the provisions of this section is not permitted on
   aircraft or satellites.

   (c) Within the 92-95 GHz bands, the emission levels shall not exceed
   the following:

   (1) The average power density of any emission, measured during the
   transmit interval, shall not exceed 9 uW/sq. cm, as measured at 3
   meters from the radiating structure, and the peak power density of any
   emission shall not exceed 18 uW/sq. cm, as measured 3 meters from the
   radiating structure.

   (2) Peak power density shall be measured with an RF detector that has a
   detection bandwidth that encompasses the band being used and has a
   video bandwidth of at least 10 MHz, or uses an equivalent measurement
   method.

   (3) The average emission limits shall be calculated based on the
   measured peak levels, over the actual time period during which
   transmission occurs.

   (d) Limits on spurious emissions:

   (1) The power density of any emissions outside the band being used
   shall consist solely of spurious emissions.

   (2) Radiated emissions below 40 GHz shall not exceed the general limits
   in § 15.209.

   (3) Between 40 GHz and 200 GHz, the level of these emissions shall not
   exceed 90 pW/cm2 at a distance of 3 meters.

   (4) The levels of the spurious emissions shall not exceed the level of
   the fundamental emission.

   (e) The total peak transmitter output power shall not exceed 500 mW.

   (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) Radio frequency devices operating under the provisions of this part
   are subject to the radio frequency radiation exposure requirements
   specified in § § 1.1307(b), 1.1310, 2.1091, and 2.1093 of this chapter,
   as appropriate. Applications for equipment authorization of mobile or
   portable devices operating under this section must contain a statement
   confirming compliance with these requirements. Technical information
   showing the basis for this statement must be submitted to the
   Commission upon request.

   (h) Any transmitter that has received the necessary FCC equipment
   authorization under the rules of this chapter may be mounted in a group
   installation for simultaneous operation with one or more other
   transmitter(s) that have received the necessary FCC equipment
   authorization, without any additional equipment authorization. However,
   no transmitter operating under the provisions of this section may be
   equipped with external phase-locking inputs that permit beam-forming
   arrays to be realized.

   [ 69 FR 3265 , Jan. 23, 2004, as amended at  85 FR 18149 , Apr. 1, 2020]