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FCC Part 15 Radio Frequency Devices
Section 15.250

The Federal Communications Commission (FCC) is the authority in the United States of America that creates and enforces the use of airwaves throughout the entire radio frequency spectrum. This group of documents contains the entirety of the FCC Part 15 regulations that concern unlicensed radio frequency devices. As with all government documents, this material is in the public domain and may be freely copied so long as the content is not changed. This copy is provided as a convenience for RF Cafe visitors. 

Click here for the Table of Contents.

 
[Code of Federal Regulations]
[Title 47, Volume 1]
[Revised as of October 1, 2008]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR15.250]
[Page 822-824]
 
                       TITLE 47--TELECOMMUNICATION
 
              CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION
 
PART 15_RADIO FREQUENCY DEVICES--Table of Contents
 
                     Subpart C_Intentional Radiators
 
Sec. 15.250  Operation of wideband systems within the band 5925-7250 MHz.
    (a) The -10 dB bandwidth of a device operating under the provisions 
of this section must be contained within the 5925-7250 MHz band under 
all conditions of operation including the effects from stepped 
frequency, frequency hopping or other modulation techniques that may be 
employed as well as the frequency stability of the transmitter over 
expected variations in temperature and supply voltage.
    (b) The -10 dB bandwidth of the fundamental emission shall be at 
least 50 MHz. For transmitters that employ frequency hopping, stepped 
frequency or similar modulation types, measurement of the -10 dB minimum 
bandwidth specified in this paragraph shall be made with the frequency 
hop or step
[[Page 823]]
function disabled and with the transmitter operating continuously at a 
fundamental frequency following the provisions of Sec. 15.31(m).
    (c) Operation on board an aircraft or a satellite is prohibited. 
Devices operating under this section may not be employed for the 
operation of toys. Except for operation onboard a ship or a terrestrial 
transportation vehicle, the use of a fixed outdoor infrastructure is 
prohibited. A fixed infrastructure includes antennas mounted on outdoor 
structures, e.g., antennas mounted on the outside of a building or on a 
telephone pole.
    (d) Emissions from a transmitter operating under this section shall 
not exceed the following equivalent isotropically radiated power (EIRP) 
density levels:
    (1) The radiated emissions above 960 MHz from a device operating 
under the provisions of this section shall not exceed the following RMS 
average limits based on measurements using a 1 MHz resolution bandwidth:
------------------------------------------------------------------------
                                                                EIRP in
                       Frequency in MHz                           dBm
------------------------------------------------------------------------
960-1610.....................................................      -75.3
1610-1990....................................................      -63.3
1990-3100....................................................      -61.3
3100-5925....................................................      -51.3
5925-7250....................................................      -41.3
7250-10600...................................................      -51.3
Above 10600..................................................      -61.3
------------------------------------------------------------------------
    (2) In addition to the radiated emission limits specified in the 
table in paragraph (d)(1) of this section, transmitters operating under 
the provisions of this section shall not exceed the following RMS 
average limits when measured using a resolution bandwidth of no less 
than 1 kHz:
------------------------------------------------------------------------
                                                                EIRP in
                       Frequency in MHz                           dBm
------------------------------------------------------------------------
1164-1240....................................................      -85.3
1559-1610....................................................      -85.3
------------------------------------------------------------------------
    (3) There is a limit on the peak level of the emissions contained 
within a 50 MHz bandwidth centered on the frequency at which the highest 
radiated emission occurs and this 50 MHz bandwidth must be contained 
within the 5925-7250 MHz band. The peak EIRP limit is 20 log (RBW/50) 
dBm where RBW is the resolution bandwidth in megahertz that is employed 
by the measurement instrument. RBW shall not be lower than 1 MHz or 
greater than 50 MHz. The video bandwidth of the measurement instrument 
shall not be less than RBW. If RBW is greater than 3 MHz, the 
application for certification filed with the Commission shall contain a 
detailed description of the test procedure, calibration of the test 
setup, and the instrumentation employed in the testing.
    (4) Radiated emissions at or below 960 MHz shall not exceed the 
emission levels in Sec. 15.209.
    (5) Emissions from digital circuitry used to enable the operation of 
the transmitter may comply with the limits in Sec. 15.209 provided it 
can be clearly demonstrated that those emissions are due solely to 
emissions from digital circuitry contained within the transmitter and 
the emissions are not intended to be radiated from the transmitter's 
antenna. Emissions from associated digital devices, as defined in Sec. 
15.3(k), e.g., emissions from digital circuitry used to control 
additional functions or capabilities other than the operation of the 
transmitter, are subject to the limits contained in subpart B of this 
part. Emissisons from these digital circuits shall not be employed in 
determining the -10 dB bandwidth of the fundamental emission or the 
frequency at which the highest emission level occurs.
    (e) Measurement procedures:
    (1) All emissions at and below 960 MHz are based on measurements 
employing a CISPR quasi-peak detector. Unless otherwise specified, all 
RMS average emission levels specified in this section are to be measured 
utilizing a 1 MHz resolution bandwidth with a one millisecond dwell over 
each 1 MHz segment. The frequency span of the analyzer should equal the 
number of sampling bins times 1 MHz and the sweep rate of the analyzer 
should equal the number of sampling bins times one millisecond. The 
provision in Sec. 15.35(c) that allows emissions to be averaged over a 
100 millisecond period does not apply to devices operating under this 
section. The video bandwidth of the measurement instrument shall not be 
less than the resolution bandwidth and trace averaging shall not be 
employed.
[[Page 824]]
The RMS average emission measurement is to be repeated over multiple 
sweeps with the analyzer set for maximum hold until the amplitude 
stabilizes.
    (2) The peak emission measurement is to be repeated over multiple 
sweeps with the analyzer set for maximum hold until the amplitude 
stabilizes.
    (3) For transmitters that employ frequency hopping, stepped 
frequency or similar modulation types, the peak emission level 
measurement, the measurement of the RMS average emission levels, and the 
measurement to determine the frequency at which the highest level 
emission occurs shall be made with the frequency hop or step function 
active. Gated signals may be measured with the gating active. The 
provisions of Sec. 15.31(c) continue to apply to transmitters that 
employ swept frequency modulation.
    (4) The -10 dB bandwidth is based on measurement using a peak 
detector, a 1 MHz resolution bandwidth, and a video bandwidth greater 
than or equal to the resolution bandwidth.
    (5) Alternative measurement procedures may be considered by the 
Commission.
[70 FR 6774, Feb. 9, 2005]



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