Goto Section: 15.519 | 15.523 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 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 § § 15.203
(c) Emissions from digital circuitry used to enable the operation of
the UWB transmitter shall comply with the limits in § 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 § 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
(d) Within the tables in § § 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, fM,
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 § 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, fM. 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 § 15.33 to determine the frequency
range over which radiated measurements are made shall be based on the
center frequency, fC, 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 § 15.33(a) or up to fC + 3/(pulse width in seconds), whichever is
higher. There is no requirement to measure emissions beyond 40 GHz
provided fC is less than 10 GHz; beyond 100 GHz if fC is at or above 10
GHz and below 30 GHz; or beyond 200 GHz if fC is at or above 30 GHz.
(i) The prohibition in § 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 § 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: 2020 |
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