Goto Section: 15.243 | 15.247 | Table of Contents
FCC 15.245
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 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:
Fundamental frequency (MHz) Field strength of fundamental (millivolts/meter)
Field strength of harmonics (millivolts/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 § 15.205, shall not
exceed the field strength limits shown in § 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 § 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 § 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 § 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]
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Goto Section: 15.243 | 15.247
Goto Year: 2014 |
2016
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