Goto Section: 15.247 | 15.250 | Table of Contents
Revised as of October 1, 2020
Goto Year:2019 |
§ 15.249 Operation within the bands 902-928 MHz, 2400-2483.5 MHz, 5725-5875
MHZ, and 24.0-24.25 GHz.
(a) Except as provided in paragraph (b) of this section, the field
strength of emissions from intentional radiators operated within these
frequency bands shall comply with the following:
Fundamental frequency Field strength of fundamental (millivolts/meter)
Field strength of harmonics (microvolts/meter)
902-928 MHz 50 500
2400-2483.5 MHz 50 500
5725-5875 MHz 50 500
24.0-24.25 GHz 250 2500
(b) Fixed, point-to-point operation as referred to in this paragraph
shall be limited to systems employing a fixed transmitter transmitting
to a fixed remote location. Point-to-multipoint systems,
omnidirectional applications, and multiple co-located intentional
radiators transmitting the same information are not allowed. Fixed,
point-to-point operation is permitted in the 24.05-24.25 GHz band
subject to the following conditions:
(1) The field strength of emissions in this band shall not exceed 2500
(2) The frequency tolerance of the carrier signal shall be maintained
within ±0.001% of the operating frequency over a temperature variation
of -20 degrees to +50 degrees C at normal supply voltage, and for a
variation in the primary supply voltage from 85% to 115% of the rated
supply voltage at a temperature of 20 degrees C. For battery operated
equipment, the equipment tests shall be performed using a new battery.
(3) Antenna gain must be at least 33 dBi. Alternatively, the main lobe
beamwidth must not exceed 3.5 degrees. The beamwidth limit shall apply
to both the azimuth and elevation planes. At antenna gains over 33 dBi
or beamwidths narrower than 3.5 degrees, power must be reduced to
ensure that the field strength does not exceed 2500 millivolts/meter.
(c) Field strength limits are specified at a distance of 3 meters.
(d) 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.
(e) As shown in § 15.35(b), for frequencies above 1000 MHz, the field
strength limits in paragraphs (a) and (b) of this section are based on
average limits. However, the peak field strength of any emission shall
not exceed the maximum permitted average limits specified above by more
than 20 dB under any condition of modulation. For point-to-point
operation under paragraph (b) of this section, the peak field strength
shall not exceed 2500 millivolts/meter at 3 meters along the antenna
[ 54 FR 17714 , Apr. 25, 1989, as amended at 55 FR 25095 , June 20, 1990;
67 FR 1625 , Jan. 14, 2002; 77 FR 4914 , Feb. 1, 2012]
Goto Section: 15.247 | 15.250
Goto Year: 2019 |
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