Sec.  15.517   Technical requirements for indoor UWB systems.

   (a)  Operation  under the provisions of this section is limited to UWB
   transmitters employed solely for indoor operation.

   (1) Indoor UWB devices, 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 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, to perform an outside
   function, such as the detection of persons about to enter a building.

   (3) 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.

   (4) Field disturbance sensors installed inside of metal or underground
   storage tanks are considered to operate indoors provided the emissions are
   directed towards the ground.

   (5)  A  communications system shall transmit only when the intentional
   radiator is sending information to an associated receiver.

   (b) The UWB bandwidth of a UWB system operating under the provisions of this
   section must be contained between 3100 MHz and 10,600 MHz.

   (c) The radiated emissions at or below 960 MHz from a device operating under
   the provisions of this section shall not exceed the emission levels in
    Sec. 15.209. The radiated emissions above 960 MHz from a device operating under
   the provisions of this section shall not exceed the following average limits
   when measured using a resolution bandwidth of 1 MHz:
   Frequency in MHz EIRP in dBm
   960–1610               −75.3
   1610–1990              −53.3
   1990–3100              −51.3
   3100–10600             −41.3
   Above 10600            −51.3

   (d) In addition to the radiated emission limits specified in the table in
   paragraph  (c)  of  this section, UWB transmitters operating under the
   provisions of this section shall not exceed the following average limits
   when measured using a resolution bandwidth of no less than 1 kHz:
   Frequency in MHz EIRP in dBm
   1164–1240              −85.3
   1559–1610              −85.3

   (e) There is a limit on the peak level of the emissions contained within a
   50 MHz bandwidth centered on the frequency at which the highest radiated
   emission occurs, f[M]. That limit is 0 dBm EIRP. It is acceptable to employ
   a different resolution bandwidth, and a correspondingly different peak
   emission limit, following the procedures described in  Sec. 15.521.

   (f) UWB systems 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.”

   [ 67 FR 34856 , May 16, 2002;  67 FR 39632 , June 10, 2002]