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FCC Part 15 Radio Frequency Devices
Section 15.255

The Federal Communications Commission (FCC) is the authority in the United States of America that creates and enforces the use of airwaves throughout the entire radio frequency spectrum. This group of documents contains the entirety of the FCC Part 15 regulations that concern unlicensed radio frequency devices. As with all government documents, this material is in the public domain and may be freely copied so long as the content is not changed. This copy is provided as a convenience for RF Cafe visitors. 

Click here for the Table of Contents.

 
[Code of Federal Regulations]
[Title 47, Volume 1]
[Revised as of October 1, 2008]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR15.255]
[Page 827-829]
 
                       TITLE 47--TELECOMMUNICATION
 
              CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION
 
PART 15_RADIO FREQUENCY DEVICES--Table of Contents
 
                     Subpart C_Intentional Radiators
 
Sec. 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:
[[Page 828]]
    (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 [mu]W/cm\2\, as measured 3 meters from the 
radiating structure, and the peak power density of any emission shall 
not exceed 18 [mu]W/cm\2\, as measured 3 meters from the radiating 
structure.
    (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 [mu]W/cm\2\, as 
measured 3 meters from the radiating structure, and the peak power 
density of any emission shall not exceed 18 [mu]W/cm\2\, 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/cm\2\, as measured 3 meters from the radiating structure, 
and the peak power density of any emission shall not exceed 18 nW/cm\2\, 
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/cm\2\ 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 
method.
    (5) The average emission levels shall be calculated, based on the 
measured peak levels, over the actual time period during which 
transmission occurs.
    (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 Sec. 15.209.
    (3) Between 40 GHz and 200 GHz, the level of these emissions shall 
not exceed 90 pW/cm\2\ 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 measurement method.
    (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
[[Page 829]]
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 Sec. Sec. 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/cm\2\, 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 
factory.
    (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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