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

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exceed the following field strength limits:
    (i) For 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 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]