Goto Section: 15.253 | 15.256 | Table of Contents
FCC 15.255
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 15.255 Operation within the band 57-64 GHz.
(a) Operation under the provisions of this section is not permitted for the
following products:
(1) Equipment used on aircraft or satellites.
(2) Field disturbance sensors, including vehicle radar systems, unless the
field disturbance sensors are employed for fixed operation. For the purposes
of this section, the reference to fixed operation includes field disturbance
sensors installed in fixed equipment, even if the sensor itself moves within
the equipment.
(b) Within the 57-64 GHz band, emission levels shall not exceed the
following equivalent isotropically radiated power (EIRP):
(1) Products other than fixed field disturbance sensors shall comply with
one of the following emission limits, as measured during the transmit
interval:
(i) Except as indicated in paragraph (b)(1)(ii) of this section, the average
power of any emission shall not exceed 40 dBm and the peak power of any
emission shall not exceed 43 dBm.
(ii) For transmitters located outdoors, the average power of any emission
shall not exceed 82 dBm minus 2 dB for every dB that the antenna gain is
less than 51 dBi. The peak power of any emission shall not exceed 85 dBm
minus 2 dB for every dB that the antenna gain is less than 51 dBi. The
provisions of § 15.204(c)(2) and (c)(4) of this part that permit the use of
different antennas of the same type and of equal or less directional gain do
not apply to intentional radiator systems operating under this provision. In
lieu thereof, intentional radiator systems shall be certified using the
specific antenna(s) with which the system will be marketed and operated.
Compliance testing shall be performed using the highest gain and the lowest
gain antennas for which certification is sought and with the intentional
radiator operated at its maximum available output power level. The
responsible party, as defined in § 2.909 of this chapter, shall supply a list
of acceptable antennas with the application for certification.
(2) For fixed field disturbance sensors that occupy 500 MHz or less of
bandwidth and that are contained wholly within the frequency band 61.0-61.5
GHz, the average power of any emission, measured during the transmit
interval, shall not exceed 40 dBm, and the peak power of any emission shall
not exceed 43 dBm. In addition, the average power of any emission outside of
the 61.0-61.5 GHz band, measured during the transmit interval, but still
within the 57-64 GHz band, shall not exceed 10 dBm, and the peak power of
any emission shall not exceed 13 dBm.
(3) For fixed field disturbance sensors other than those operating under the
provisions of paragraph (b)(2) of this section, the peak transmitter
conducted output power shall not exceed −10 dBm and the peak EIRP level
shall not exceed 10 dBm.
(4) The peak power shall be measured with an RF detector that has a
detection bandwidth that encompasses the 57-64 GHz band and has a video
bandwidth of at least 10 MHz. The average emission levels shall be
calculated based on the measured peak levels, over the actual time period
during which transmission occurs. Measurement procedures that have been
found to be acceptable to the Commission in accordance with § 2.947 of this
chapter may be used to demonstrate compliance.
(c) Limits on spurious emissions:
(1) The power density of any emissions outside the 57-64 GHz band shall
consist solely of spurious emissions.
(2) Radiated emissions below 40 GHz shall not exceed the general limits in
§ 15.209.
(3) Between 40 GHz and 200 GHz, the level of these emissions shall not
exceed 90 pW/cm2 at a distance of 3 meters.
(4) The levels of the spurious emissions shall not exceed the level of the
fundamental emission.
(d) Only spurious emissions and transmissions related to a
publicly-accessible coordination channel, whose purpose is to coordinate
operation between diverse transmitters with a view towards reducing the
probability of interference throughout the 57-64 GHz band, are permitted in
the 57-57.05 GHz band.
Note to paragraph (d): The 57-57.05 GHz is reserved exclusively for a
publicly-accessible coordination channel. The development of standards for
this channel shall be performed pursuant to authorizations issued under part
5 of this chapter.
(e) Except as specified paragraph (e)(1) of this section, the peak
transmitter conducted output power shall not exceed 500 mW. Depending on the
gain of the antenna, it may be necessary to operate the intentional radiator
using a lower peak transmitter output power in order to comply with the EIRP
limits specified in paragraph (b) of this section.
(1) Transmitters with an emission bandwidth of less than 100 MHz must limit
their peak transmitter conducted output power to the product of 500 mW times
their emission bandwidth divided by 100 MHz. For the purposes of this
paragraph, emission bandwidth is defined as the instantaneous frequency
range occupied by a steady state radiated signal with modulation, outside
which the radiated power spectral density never exceeds 6 dB below the
maximum radiated power spectral density in the band, as measured with a 100
kHz resolution bandwidth spectrum analyzer. The center frequency must be
stationary during the measurement interval, even if not stationary during
normal operation (e.g., for frequency hopping devices).
(2) Peak transmitter conducted output power shall be measured with an RF
detector that has a detection bandwidth that encompasses the 57-64 GHz band
and that has a video bandwidth of at least 10 MHz. Measurement procedures
that have been found to be acceptable to the Commission in accordance with
§ 2.947 of this chapter may be used to demonstrate compliance.
(3) For purposes of demonstrating compliance with this paragraph,
corrections to the transmitter conducted output power may be made due to the
antenna and circuit loss.
(f) Frequency stability. Fundamental emissions must be contained within the
frequency bands specified in this section during all conditions of
operation. Equipment is presumed to operate over the temperature range −20
to + 50 degrees Celsius with an input voltage variation of 85% to 115% of
rated input voltage, unless justification is presented to demonstrate
otherwise.
(g) Regardless of the power density levels permitted under this section,
devices operating under the provisions of this section are subject to the
radiofrequency radiation exposure requirements specified in § § 1.1307(b),
2.1091 and 2.1093 of this chapter, as appropriate. Applications for
equipment authorization of devices operating under this section must contain
a statement confirming compliance with these requirements for both
fundamental emissions and unwanted emissions. Technical information showing
the basis for this statement must be submitted to the Commission upon
request.
(h) Any transmitter that has received the necessary FCC equipment
authorization under the rules of this chapter may be mounted in a group
installation for simultaneous operation with one or more other
transmitter(s) that have received the necessary FCC equipment authorization,
without any additional equipment authorization. However, no transmitter
operating under the provisions of this section may be equipped with external
phase-locking inputs that permit beam-forming arrays to be realized.
[ 63 FR 42279 , Aug. 7, 1998, as amended at 66 FR 7409 , Jan. 23, 2001; 68 FR 68547 , Dec. 9, 2003; 78 FR 59850 , Sept. 30, 2013]
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Goto Section: 15.253 | 15.256
Goto Year: 2014 |
2016
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