Goto Section: 15.253 | 15.257 | Table of Contents
Revised as of December 4, 2012
Goto Year:2011 |
§ 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
(1) For products other than fixed field disturbance sensors, the
average power density of any emission, measured during the transmit
interval, shall not exceed 9 μW/cm2 , as measured 3 meters from the
radiating structure, and the peak power density of any emission shall
not exceed 18 μW/cm2 , as measured 3 meters from the radiating
(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 density of any emission, measured
during the transmit interval, shall not exceed 9 μW/cm2 , as measured 3
meters from the radiating structure, and the peak power density of any
emission shall not exceed 18 μW/cm2 , as measured 3 meters from the
radiating structure. In addition, the average power density of any
emission outside of the 61-61.5 GHz band, measured during the transmit
interval, but still within the 57-64 GHz band, shall not exceed 9
nW/cm2 , as measured 3 meters from the radiating structure, and the
peak power density of any emission shall not exceed 18 nW/cm2 , as
measured three meters from the radiating structure.
(3) For fixed field disturbance sensors other than those operating
under the provisions of paragraph (b)(2) of this section, the peak
transmitter output power shall not exceed 0.1 mW and the peak power
density shall not exceed 9 nW/cm2 at a distance of 3 meters.
(4) Peak power density 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, or using an equivalent measurement
(5) The average emission levels shall be calculated, based on the
measured peak levels, over the actual time period during which
(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 elsewhere in this paragraph (e), the total peak
transmitter output power shall not exceed 500 mW.
(1) Transmitters with an emission bandwidth of less than 100 MHz must
limit their peak transmitter output power to the product of 500 mW
times their emission bandwidth divided by 100 MHz. For the purposes of
this paragraph (e)(1), 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 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, or using an equivalent
(3) For purposes of demonstrating compliance with this paragraph (e),
corrections to the transmitter output power may be made due to the
antenna and circuit loss.
(f) 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.
(i) For all transmissions that emanate from inside of a building,
within any one second interval of signal transmission, each transmitter
with a peak output power equal to or greater than 0.1 mW or a peak
power density equal to or greater than 3 nW/cm2 , as measured 3 meters
from the radiating structure, must transmit a transmitter
identification at least once. Each application for equipment
authorization for equipment that will be used inside of a building must
declare that the equipment contains the required transmitter
identification feature and must specify a method whereby interested
parties can obtain sufficient information, at no cost, to enable them
to fully detect and decode this transmitter identification information.
Upon the completion of decoding, the transmitter identification data
block must provide the following fields:
(1) FCC Identifier, which shall be programmed at the factory.
(2) Manufacturer's serial number, which shall be programmed at the
(3) Provision for at least 24 bytes of data relevant to the specific
device, which shall be field programmable. The grantee must implement a
method that makes it possible for users to specify and update this
data. The recommended content of this field is information to assist in
contacting the operator.
[ 63 FR 42279 , Aug. 7, 1998, as amended at 66 FR 7409 , Jan. 23, 2001; 68 FR 68547 , Dec. 9, 2003]
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Goto Section: 15.253 | 15.257
Goto Year: 2011 |
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