Sec.  15.245   Operation within the bands 902-928 MHz, 2435-2465 MHz, 5785-5815
MHz, 10500-10550 MHz, and 24075-24175 MHz.

   

   (a) Operation under the provisions of this section is limited to
   intentional radiators used as field disturbance sensors, excluding
   perimeter protection systems.

   (b) The field strength of emissions from intentional radiators
   operated within these frequency bands shall comply with the following:


------------------------------------------------------------------------
                                                  Field         Field
                                               strength of   strength of
         Fundamental frequency (MHz)           fundamental    harmonics
                                              (millivolts/  (millivolts/
                                                 meter)        meter)
------------------------------------------------------------------------
902-928.....................................           500           1.6
2435-2465...................................           500           1.6
5785-5815...................................           500           1.6
10500-10550.................................          2500          25.0
24075-24175.................................          2500          25.0
------------------------------------------------------------------------

   (1) Regardless of the limits shown in the above table, harmonic
   emissions in the restricted bands below 17.7 GHz, as specified in
   Sec. 15.205, shall not exceed the field strength limits shown in Sec. 15.209.
   Harmonic emissions in the restricted bands at and above 17.7 GHz shall
   not exceed the following field strength limits:

   (i) For the second and third harmonics of field disturbance sensors
   operating in the 24075-24175 MHz band and for other field disturbance
   sensors designed for use only within a building or to open building
   doors, 25.0 mV/m.

   (ii) For all other field disturbance sensors, 7.5 mV/m.

   (iii) Field disturbance sensors designed to be used in motor vehicles
   or aircraft must include features to prevent continuous operation
   unless their emissions in the restricted bands, other than the second
   and third harmonics from devices operating in the 24075-24175 MHz
   band, fully comply with the limits given in Sec. 15.209. Continuous
   operation of field disturbance sensors designed to be used in farm
   equipment, vehicles such as fork lifts that are intended primarily for
   use indoors or for very specialized operations, or railroad
   locomotives, railroad cars and other equipment which travels on fixed
   tracks is permitted. A field disturbance sensor will be considered not
   to be operating in a continuous mode if its operation is limited to
   specific activities of limited duration (e.g., putting a vehicle into
   reverse gear, activating a turn signal, etc.).

   (2) Field strength limits are specified at a distance of 3 meters.

   (3) Emissions radiated outside of the specified frequency bands,
   except for harmonics, shall be attenuated by at least 50 dB below the
   level of the fundamental or to the general radiated emission limits in
   Sec. 15.209, whichever is the lesser attenuation.

   (4) The emission limits shown above are based on measurement
   instrumentation employing an average detector. The provisions in
   Sec. 15.35 for limiting peak emissions apply.

   [ 54 FR 17714 , Apr. 25, 1989, as amended at  55 FR 46792 , Nov. 7, 1990;
    61 FR 42558 , Aug. 16, 1996;  68 FR 68547 , Dec. 9, 2003]