[Federal Register: February 9, 2005 (Volume 70, Number 26)]
[Rules and Regulations]
[Page 6771-6776]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr09fe05-6]
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FEDERAL COMMUNICATIONS COMMISSION
47 CFR Part 15
[ET Docket No. 98-153; FCC 04-285]
Ultra-Wideband Transmission Systems
AGENCY: Federal Communications Commission.
ACTION: Final rule.
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SUMMARY: This document responds to two petitions for reconsideration
that were filed in response to the Commission's decision to establish
regulations for unlicensed ultra-wideband (``UWB'') operation. It also
responds to the rule making proposals contained in the Memorandum
Opinion and Order and Further Notice of Proposed Rule Making in this
docket. The order establishes new rules for wideband unlicensed devices
operating in the 5925-7250 MHz, 16.2-17.7 GHz, and 22.12-29 GHz bands.
DATES: Effective March 11, 2005.
FOR FURTHER INFORMATION CONTACT: John Reed (202) 418-2455, Policy and
Rules Division, Office of Engineering and Technology.
SUPPLEMENTARY INFORMATION: This is a summary of the Second Report and
Order and Second Memorandum Opinion and Order (``2nd R&O and 2nd
MO&O''), FCC 04-285, adopted December 15, 2004, and released December
16, 2004. The full text of this document is available for inspection
and copying during regular business hours in the FCC Reference Center
(Room CY-A257), 445 12th Street, SW., Washington, DC 20554. The
complete text of this document also may be purchased from the
Commission's copy contractor, Best Copy and Printing, Inc. 445 12th
Street, Room CY-B402, Washington, DC, (202) 488-5300; FAX (202) 488-
5563. The full text may also be downloaded at: http://www.fcc.gov. Alternative
formats are available to persons with disabilities by contacting Brian
Millin at (202) 418-7426 or TTY (202) 418-7365.
Summary of Second Report and Order
1. On February 14, 2002, the Commission adopted a First Report and
Order implementing regulations to permit the unlicensed operation of
ultra-wideband transmission systems. In response to fourteen petitions
for reconsideration, a Memorandum Opinion and Order and Further Notice
of Proposed Rule Making (``MO&O and FNPRM'') was adopted on February
13, 2003, 69 FR 19746 and 69 FR 19773, April 22, 2003. Specifically,
the Commission proposed amendments to four areas of its part 15
regulations. These amendments addressed: (1) The operation of low PRF
systems in the 3.1-10.6 GHz band; (2) the measurement procedures
applied to frequency hopping vehicular radar systems operating in the
22-29 GHz band; (3) the peak power limits applicable to wide-bandwidth,
non-UWB part 15 transmitters; and (4) the elimination of the UWB
definition.
2. Low PRF UWB systems. In the FNPRM, the Commission invited
comment on whether to amend the rules to permit the operation of any
UWB product under the UWB standards currently designated for hand-held
devices as long as the PRF does not exceed 200 kHz and the equipment
employs a pulsed or an impulse modulation. In the 2nd R&O, the
Commission declines to amend its rules stating that low PRF systems can
have a higher potential for causing interference unless some type of
signal processing is incorporated in the victim receiver. The
Commission will accommodate the requests from the equipment developers
by increasing the peak power emission limit for select frequency bands
available under the non-UWB part 15 regulations.
3. Non-UWB peak power emission limits. When an average emission
limit
[[Page 6772]]
is specified for non-UWB devices, the rules also specify a limit on
peak power that is 20 dB greater than the average limit. In some cases,
peak measurement by a spectrum analyzer requires the application of a
pulse desensitization correction factor (``PDCF'') in order to
compensate for the analyzer's inability to respond fast enough to
measure the true peak for pulse widths narrower than the inverse of the
resolution bandwidth. This peak limit may effectively prohibit some
wideband operations. Further, a limit on the total peak power level is
not well suited to measure the operation of, or represent the
interference potential of, transmitters that employ extremely wide
bandwidths. For that reason, the Commission proposed in the FNPRM to
implement the same peak limit that is applied to UWB systems.
4. The total peak power of such a wideband system is not relevant
to the interference potential of the device. Rather, it is the
potential power in the bandwidth of the victim receiver that is
relevant. In the 2nd R&O, the Commission recognizes that allowing
increased peak power levels could have an impact on some radio services
and also expresses concerned that allowing higher peak power levels
could result in a significant increase in the number of consumer
products along with a corresponding increase in interference potential.
Thus, it believes that cautious constraints on the permitted frequency
bands of operation and the standards for operation within those bands
are necessary while it gains experience.
5. The Commission is amending its part 15 rules to permit higher
peak emission levels in the 5925-7250 MHz band, indicating that the
fixed, fixed-satellite, and mobile systems employed in this band likely
incorporate a sufficient level of signal processing to reduce, if not
eliminate, their vulnerability to increased peak emission levels, or it
is expected that such authorized systems would generally be located in
remote areas or with the receiving antennas situated in such a manner
that they would not be routinely subject to emissions from nearby part
15 devices. The Commission also is permitting higher peak emission
levels in the 16.2-17.7 GHz band but will limit operation within this
band to vehicular back-up assistance radars that operate only when the
vehicle is in reverse. This will significantly limit the proliferation
of such devices and should ensure that harmful interference does not
occur to the authorized radio services. Potential equipment
manufacturers are forewarned that the 17.3-17.7 GHz portion of the
16.2-17.7 GHz band has been allocated in Region 2 and the United States
for the Broadcast Satellite Service, effective April 1, 2007. Once this
allocation becomes effective, there is a possibility that the 17.3-17.7
GHz band may become designated as a restricted band and that part 15
fundamental emissions will be prohibited in this portion of the
spectrum.
6. A peak EIRP limit of 20 log (RBW/50) dBm is adopted for the
5925-7250 MHz and 16.2-17.7 GHz bands, with RBW, the resolution
bandwidth of the measurement instrument, being 1 to 50 MHz. This peak
limit applies to the 50 MHz band centered at the frequency at which the
highest average emission level occurs. RBW must be no greater than the
-10 dB bandwidth of the emission. If frequency hopping or stepped
frequency modulation is employed, the frequency hop or step function
shall be disabled and the transmitter shall operate continuously on a
fundamental frequency to measure the -10 dB bandwidth that is used to
determine the maximum RBW that may be employed for the peak emission
level. For transmitters operating under these new peak limits, the
Commission is adopting the more stringent UWB average emission
specifications requested by the National Telecommunications and
Information Administration (``NTIA''). These limits and other pertinent
standards are shown in the accompanying changes to the rules.
7. Vehicular radar systems. In the FNPRM, the Commission proposed
to permit pulsed frequency hopping vehicular radars to be included
under the definition of a UWB device provided the transmitters occupy
the minimum required bandwidth within any 10 millisecond period rather
than at any instantaneous point in time. However, the Commission is
unwilling at this time to classify as a UWB device a frequency hopping
transmitter that emits relatively narrowband signals. However, the
systems can be accommodated under the non-UWB rules by increasing the
peak power emission limit. As requested by NTIA, a frequency hopped
vehicular radar system may not operate in the restricted bands. Thus,
the frequency band of operation that is being established for this
vehicle radar system is 23.12-29.0 GHz, exclusive of the restricted
band at 23.6-24.0 GHz. Vehicular radar transmitters operating under
these new peak limits also will be subject to limits similar to the UWB
average emission specifications, as requested by NTIA. Any type of
modulation may be employed. These limits and other pertinent standards
are shown in the accompanying changes to the rules.
8. The interference aspects of a transmitter employing frequency
hopping, stepped frequency modulation or gating are quite similar, as
viewed by a receiver, in that both appear to the receiver to emit for a
short period of time followed by a quiet period. Permitting the
emissions from frequency hopping systems to be measured with the
hopping active could give such systems a competitive advantage by
permitting higher instantaneous average power levels than what are
allowed for gated systems. Thus, the Commission also is eliminating the
requirement that gated or stepped systems operating under this new
regulation be tested with the gating or step function turned off.
However, no provision is provided to permit transmitters employing
swept frequency modulation to perform measurements with the sweep
stopped. The Commission also is adopting NTIA's requested measurement
procedure requiring that the RMS average and peak emission measurements
be repeated with the analyzer in the maximum hold mode until there is
no significant increase, i.e., less than 3 dB, in any of the maximum
hold values.
9. The UWB regulations for operation in the 22-29 GHz band require
vehicular radar systems that employ gating to be measured with the
transmitter gated on and should be subject to the same measurement
procedures. Thus, the Commission is amending the UWB regulations to
permit the emissions from gated vehicular radar systems to be measured
with the gating active. However, as requested by NTIA similar
provisions are not being applied to UWB systems that employ frequency
hopping, stepped frequency or similar modulation techniques.
10. Clarification of existing non-UWB peak power emission limits.
As proposed in the FNPRM, the Commission is amending 47 CFR 15.35(b) to
clarify that the peak power requirement applies to the total peak power
produced by the device, unless specifically stated otherwise, and may
necessitate the use of a PDCF. This clarification does not result in
any changes to the current part 15 standards and should eliminate any
confusion on the need to apply a PDCF under certain modulation and
measurement conditions.
11. UWB definition. In the FNPRM, the Commission proposed to
eliminate the minimum bandwidth requirement and to permit the operation
of any transmission system, regardless of its
[[Page 6773]]
bandwidth, as long as it complies with the standards for UWB operation
set forth in Subpart F of 47 CFR part 15. However, the Commission has
accommodated the narrowband operations sought by the proponents in this
proceeding through its amendments to the peak power levels while
keeping any further expansion of equipment applications out of the
sensitive restricted bands. Because of these changes, there is no
necessity at this time to eliminate the UWB minimum bandwidth
requirements. Such changes could be disruptive and could further delay
the introduction of UWB devices.
Summary of Second Memorandum Opinion and Order
12. The 2nd MO&O addresses two petitions for reconsideration that
were filed in response to the Memorandum Opinion and Order and Further
Notice of Proposed Rule Making. Cingular, Inc. objected to the presence
and level of emissions from UWB devices that may appear in the
frequency bands allocated for the Cellular Radiotelephone Service
(``cellular'') and for the Personal Communications Services (``PCS'');
claimed that the Commission can not legally permit the unlicensed
operation of radio frequency (``RF'') devices except as specifically
authorized by Congress under 47 U.S.C. 307(e); and claimed that
cellular and PCS licensees have exclusive use of the spectrum assigned
to their respective operations and that any emissions from UWB devices
undermine this exclusivity. The issues raised by Cingular are dismissed
or denied, as appropriate. The Satellite Industry Association (``SIA'')
argued that the UWB emission limits in the 3650-4200 MHz band used by
C-band fixed satellite systems (``FSS'') are excessive and will result
in harmful interference. The SIA petition is denied.
Administrative Provisions
13. The Commission will send a copy of this Second Report & Order
and Second Memorandum Opinion and Order in a report to be sent to
Congress and the General Accounting Office pursuant to the
Congressional Review Act, see 5 U.S.C. 801(a)(1)(A).
14. Final Regulatory Flexibility Certification. The Regulatory
Flexibility Act of 1980, as amended (RFA),\1\ requires that a
regulatory flexibility analysis be prepared for notice-and-comment rule
making proceedings, unless the agency certifies that ``the rule will
not, if promulgated, have a significant economic impact on a
substantial number of small entities.'' \2\ The RFA generally defines
the term ``small entity'' as having the same meaning as the terms
``small business,'' ``small organization,'' and ``small governmental
jurisdiction.'' \3\ In addition, the term ``small business'' has the
same meaning as the term ``small business concern'' under the Small
Business Act.\4\ A ``small business concern'' is one which: (1) Is
independently owned and operated; (2) is not dominant in its field of
operation; and (3) satisfies any additional criteria established by the
Small Business Administration (SBA).\5\
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\1\ The RFA, see 5 U.S.C. 601-612, has been amended by the Small
Business Regulatory Enforcement Fairness Act of 1996 (SBREFA),
Public Law 104-121, Title II, 110 Stat. 857 (1996).
\2\ 5 U.S.C. 605(b).
\3\ 5 U.S.C. 601(6).
\4\ 5 U.S.C. 601(3) (incorporating by reference the definition
of ``small-business concern'' in the Small Business Act, 15 U.S.C.
632). Pursuant to 5 U.S.C. 601(3), the statutory definition of a
small business applies ``unless an agency, after consultation with
the Office of Advocacy of the Small Business Administration and
after opportunity for public comment, establishes one or more
definitions of such term which are appropriate to the activities of
the agency and publishes such definition(s) in the Federal
Register.''
\5\ 15 U.S.C. 632.
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15. In this Second Report and Order and Second Memorandum Opinion
and Order, we are implementing a change to the rules to facilitate the
operation of wideband unlicensed transmitters. We also are responding
to two petitions for reconsideration regarding rules that permit the
marketing and operation of products incorporating ultra-wideband
(``UWB'') technology. UWB devices operate by employing very narrow or
short duration pulses that result in very large or wideband
transmission bandwidths. With appropriate technical standards, UWB
devices can operate on spectrum occupied by existing radio services
without causing interference, thereby permitting scarce spectrum
resources to be used more efficiently. Further, as noted in the text we
have continued to apply conservative limits to the standards applicable
for UWB operation, until such time as we gain additional experience, to
ensure that harmful interference would not be caused to other radio
spectrum users. Further, the changes adopted in this proceeding will
not affect any party legally manufacturing or marketing UWB devices.
Thus, we expect that our actions do not amount to a significant
economic impact. Accordingly, we certify that the rules being adopted
in this Memorandum Opinion and Order will not have a significant
economic impact on a substantial number of small entities.
16. The Commission will send a copy of the Second Report and Order
and Second Memorandum Opinion and Order, including a copy of this Final
Regulatory Flexibility Certification, in a report to Congress pursuant
to the Congressional Review Act.\6\ In addition, the Second Report and
Order and Second Memorandum Opinion and Order and this final
certification will be sent to the Chief Counsel for Advocacy of the
SBA, and will be published in the Federal Register.\7\
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\6\ See 5 U.S.C. 801(a)(1)(A).
\7\ See 5 U.S.C. 605(b).
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17. Ordering Clauses. This action is taken pursuant to Sections
4(i), 302, 303(e), 303(f), 303(r), 304 and 307 of the Communications
Act of 1934, as amended, 47 U.S.C. Sections 154(i), 302, 303(e),
303(f), 303(r), 304 and 307. It also is ordered that part 15 of the
Commission's Rules and Regulations is amended as specified in rule
changes, effective 30 days after publication in the Federal Register.
It is ordered that the Petition for Reconsideration from Cingular,
Inc., is denied. It is ordered that the Petition for Reconsideration
from Satellite Industry Association is dismissed.
18. The Commission's Consumer and Governmental Affairs Bureau,
Reference Information Center, shall send a copy of this Second Report
and Order and Second Memorandum Opinion and Order, including the Final
Regulatory Flexibility Certification, to the Chief Counsel for Advocacy
of the Small Business Administration.
19. It is further ordered that this proceeding is terminated.
List of Subjects 47 CFR Part 15
Communications equipment, Radio, Reporting and recordkeeping
requirements, Security measures.
Federal Communications Commission.
William F. Caton,
Deputy Secretary.
Rule Changes
0
For the reasons discussed in the preamble, title 47 of the Code of
Federal Regulations, part 15, is amended as follows:
PART 15--RADIO FREQUENCY DEVICES
0
1. The authority citation for part 15 continues to read as follows:
Authority: 47 U.S.C. 154, 302a, 303, 304, 307, 336 and 544a.
0
2. Section 15.35 is amended by revising paragraph (b) to read as
follows:
Sec. 15.35 Measurement detector functions and bandwidths.
* * * * *
[[Page 6774]]
(b) Unless otherwise specified, on any frequency or frequencies
above 1000 MHz, the radiated emission limits are based on the use of
measurement instrumentation employing an average detector function.
Unless otherwise specified, measurements above 1000 MHz shall be
performed using a minimum resolution bandwidth of 1 MHz. When average
radiated emission measurements are specified in this part, including
average emission measurements below 1000 MHz, there also is a limit on
the peak level of the radio frequency emissions. Unless otherwise
specified, e.g., see Sec. Sec. 15.250, 15.252, 15.255, and 15.509-
15.519, the limit on peak radio frequency emissions is 20 dB above the
maximum permitted average emission limit applicable to the equipment
under test. This peak limit applies to the total peak emission level
radiated by the device, e.g., the total peak power level. Note that the
use of a pulse desensitization correction factor may be needed to
determine the total peak emission level. The instruction manual or
application note for the measurement instrument should be consulted for
determining pulse desensitization factors, as necessary.
* * * * *
0
3. Section 15.215 is amended by revising paragraph (c), to read as
follows:
Sec. 15.215 Additional provisions to the general radiated emission
limitations.
* * * * *
(c) Intentional radiators operating under the alternative
provisions to the general emission limits, as contained in Sec. Sec.
15.217 through 15.257 and in Subpart E of this part, must be designed
to ensure that the 20 dB bandwidth of the emission, or whatever
bandwidth may otherwise be specified in the specific rule section under
which the equipment operates, is contained within the frequency band
designated in the rule section under which the equipment is operated.
The requirement to contain the designated bandwidth of the emission
within the specified frequency band includes the effects from frequency
sweeping, frequency hopping and other modulation techniques that may be
employed as well as the frequency stability of the transmitter over
expected variations in temperature and supply voltage. If a frequency
stability is not specified in the regulations, it is recommended that
the fundamental emission be kept within at least the central 80% of the
permitted band in order to minimize the possibility of out-of-band
operation.
0
4. Section 15.250 is added to read as follows:
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 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
[[Page 6775]]
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. 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.
0
5. Section 15.252 is added to read as follows:
Sec. 15.252 Operation of wideband vehicular radar systems within the
bands 16.2-17.7 GHz and 23.12-29.0 GHz.
(a) Operation under this section is limited to field disturbance
sensors that are mounted in terrestrial transportation vehicles.
Terrestrial use is limited to earth surface-based, non-aviation
applications. Operation within the 16.2-17.7 GHz band is limited to
field disturbance sensors that are used only for back-up assistance and
that operate only when the vehicle is engaged in reverse.
(1) The -10 dB bandwidth of the fundamental emission shall be
located within the 16.2-17.7 GHz band or within the 23.12-29.0 GHz
band, exclusive of the 23.6-24.0 GHz restricted band, as appropriate,
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.
(2) The -10 dB bandwidth of the fundamental emission shall be 10
MHz or greater. 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 function disabled and with the transmitter
operating continuously at a fundamental frequency following the
provisions of Sec. 15.31(m).
(3) For systems operating in the 23.12-29.0 GHz band, the
frequencies at which the highest average emission level and at which
the highest peak level emission appear shall be greater than 24.075
GHz.
(4) These devices shall operate only when the vehicle is operating,
e.g., the engine is running. Operation shall occur only upon specific
activation, such as upon starting the vehicle, changing gears, or
engaging a turn signal. The operation of these devices shall be related
to the proper functioning of the transportation vehicle, e.g.,
collision avoidance.
(b) Emissions from a transmitter operating under this section shall
not exceed the following equivalent isotropically radiated power (EIRP)
density levels:
(1) For transmitters operating in the 16.2-17.7 GHz band, the RMS
average radiated emissions above 960 MHz from a device operating under
the provisions of this section shall not exceed the following EIRP
limits based on measurements using a 1 MHz resolution bandwidth:
------------------------------------------------------------------------
EIRP in
Frequency in MHz dBm
------------------------------------------------------------------------
960-1610..................................................... -75.3
1610-16,200.................................................. -61.3
16,200-17,700................................................ -41.3
Above 17,700................................................. -61.3
------------------------------------------------------------------------
(2) For transmitters operating in the 23.12-29.0 GHz band, the RMS
average radiated emissions above 960 MHz from a device operating under
the provisions of this section shall not exceed the following EIRP
limits based on measurements using a 1 MHz resolution bandwidth:
------------------------------------------------------------------------
EIRP in
Frequency in MHz dBm
------------------------------------------------------------------------
960-1610..................................................... -75.3
1610-23,120.................................................. -61.3
23,120-23,600................................................ -41.3
23,600-24,000................................................ -61.3
24,000-29,000................................................ -41.3
Above 29,000................................................. --61.3
------------------------------------------------------------------------
(3) In addition to the radiated emission limits specified in the
tables in paragraphs (b)(1) and (b)(2) of this section, transmitters
operating under the provisions of this section shall not exceed the
following RMS average EIRP 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
------------------------------------------------------------------------
(4) 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 16.2-17.7 GHz band or the 24.05-29.0 GHz band, as
appropriate. The peak EIRP limit is 20 log (RBW/50) dBm where RBW is
the resolution bandwidth in MHz employed by the measurement instrument.
RBW shall not be lower than 1 MHz or greater than 50 MHz. Further, RBW
shall not be greater than the -10 dB bandwidth of the device under
test. 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 function disabled and with the transmitter operating
continuously at a fundamental frequency. The video bandwidth of the
measurement instrument shall not be less than RBW. The limit on peak
emissions applies to the 50 MHz bandwidth centered on the frequency at
which the highest level radiated emission occurs. If RBW is greater
than 3 MHz, the application for certification shall contain a detailed
description of the test procedure, the instrumentation employed in the
testing, and the calibration of the test setup.
(5) Radiated emissions at or below 960 MHz shall not exceed the
emission levels in Sec. 15.209.
(6) 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. Emissions from these digital circuits shall not be employed in
determining the -10 dB bandwidth of
[[Page 6776]]
the fundamental emission or the frequency at which the highest emission
level occurs.
(c) 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. 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, the
measurement to determine the center frequency, 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.
0
6. Section 15.515 is amended by adding a new paragraph (g) to read as
follows:
Sec. 15.515 Technical requirements for vehicular radar systems.
* * * * *
(g) The emission levels from devices operating under the provisions
of this section that employ gated transmissions may be measured with
the gating active. Measurements made in this manner shall be repeated
over multiple sweeps with the analyzer set for maximum hold until the
amplitude stabilizes.
0
7. Section 15.521 is amended by revising paragraph (d) to read as
follows:
Sec. 15.521 Technical requirements applicable to all UWB devices.
* * * * *
(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.
* * * * *
[FR Doc. 05-2505 Filed 2-8-05; 8:45 am]
BILLING CODE 6712-01-P