Goto Section: 15.243 | 15.247 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 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]
Goto Section: 15.243 | 15.247
Goto Year: 2020 |
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