Goto Section: 17.247 | 17.250
FCC 17.249
Revised as of June 29, 2005
Goto Year:2004 |
2006
Sec. 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:
------------------------------------------------------------------------
Field Field
strength of strength of
Fundamental frequency fundamental harmonics
(millivolts/ (microvolts/
meter) 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
millivolts/meter.
(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
Sec. 15.209, whichever is the lesser attenuation.
(e) As shown in Sec. 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
azimuth.
(f) Parties considering the manufacture, importation, marketing or
operation of equipment under this section should also note the
requirement in Sec. 15.37(d).
[ 54 FR 17714 , Apr. 25, 1989, as amended at 55 FR 25095 , June 20, 1990;
67 FR 1625 , Jan. 14, 2002]
Goto Section: 17.247 | 17.250
Goto Year: 2004 |
2006
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