Goto Section: 15.519 | 15.523 | Table of Contents
FCC 15.521
Revised as of October 1, 2007
Goto Year:2006 |
2008
Sec. 15.521 Technical requirements applicable to all UWB devices.
(a) UWB devices may not be employed for the operation of toys. Operation
onboard an aircraft, a ship or a satellite is prohibited.
(b) Manufacturers and users are reminded of the provisions of Sec. Sec. 15.203 and
15.204.
(c) Emissions from digital circuitry used to enable the operation of the UWB
transmitter shall comply with the limits in Sec. 15.209, rather than the limits
specified in this subpart, provided it can be clearly demonstrated that
those emissions from the UWB device are due solely to emissions from digital
circuitry contained within the transmitter and that 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 UWB transmission, are subject to the limits contained in Subpart B
of this part.
(d) Within the tables in Sec. Sec. 15.509, 15.511, 15.513, 15.515, 15.517, and
15.519, the tighter emission limit applies at the band edges. Radiated
emission levels at and below 960 MHz are based on measurements employing a
CISPR quasi-peak detector. Radiated emission levels above 960 MHz are based
on RMS average measurements over a 1 MHz resolution bandwidth. The RMS
average measurement is based on the use of a spectrum analyzer with a
resolution bandwidth of 1 MHz, an RMS detector, and a 1 millisecond or less
averaging time. Unless otherwise stated, if pulse gating is employed where
the transmitter is quiescent for intervals that are long compared to the
nominal pulse repetition interval, measurements shall be made with the pulse
train gated on. Alternative measurement procedures may be considered by the
Commission.
(e) The frequency at which the highest radiated emission occurs, f[M], must
be contained within the UWB bandwidth.
(f) Imaging systems may be employed only for the type of information
exchange described in their specific definitions contained in Sec. 15.503. The
detection of tags or the transfer or data or voice information is not
permitted under the standards for imaging systems.
(g) When a peak measurement is required, it is acceptable to use a
resolution bandwidth other than the 50 MHz specified in this subpart. This
resolution bandwidth shall not be lower than 1 MHz or greater than 50 MHz,
and the measurement shall be centered on the frequency at which the highest
radiated emission occurs, f[M]. If a resolution bandwidth other than 50 MHz
is employed, the peak EIRP limit shall be 20 log (RBW/50) dBm where RBW is
the resolution bandwidth in megahertz that is employed. This may be
converted to a peak field strength level at 3 meters using E(dBuV/m) = P(dBm
EIRP) + 95.2. If RBW is greater than 3 MHz, the application for
certification filed with the Commission must contain a detailed description
of the test procedure, calibration of the test setup, and the
instrumentation employed in the testing.
(h) The highest frequency employed in Sec. 15.33 to determine the frequency
range over which radiated measurements are made shall be based on the center
frequency, f[C], unless a higher frequency is generated within the UWB
device. For measuring emission levels, the spectrum shall be investigated
from the lowest frequency generated in the UWB transmitter, without going
below 9 kHz, up to the frequency range shown in Sec. 15.33(a) or up to f[C]+
3/(pulse width in seconds), whichever is higher. There is no requirement to
measure emissions beyond 40 GHz provided f[C]is less than 10 GHz; beyond 100
GHz if f[C]is at or above 10 GHz and below 30 GHz; or beyond 200 GHz if
f[C]is at or above 30 GHz.
(i) The prohibition in Sec. 2.201(f) and 15.5(d) of this chapter against Class B
(damped wave) emissions does not apply to UWB devices operating under this
subpart.
(j) Responsible parties are reminded of the other standards and requirements
cross referenced in Sec. 15.505, such as a limit on emissions conducted onto the
AC power lines.
[ 67 FR 34856 , May 16, 2002, as amended at 68 FR 19751 , Apr. 22, 2003; 70 FR 6776 , Feb. 9, 2005]
Goto Section: 15.519 | 15.523
Goto Year: 2006 |
2008
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