|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
CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION
PART 15_RADIO FREQUENCY DEVICES--Table of Contents
Subpart C_Intentional Radiators
Sec. 15.257 Operation within the band 92-95 GHz.
(a) Operation of devices under the provisions of this section is
limited to indoor use;
(1) Devices operating under the provisions of this section, by the
nature of their design, must be capable of operation only indoors. The
necessity to operate with a fixed indoor infrastructure, e.g., a
transmitter that must be connected to the AC power lines, may be
considered sufficient to demonstrate this.
(2) The use of outdoor mounted antennas, e.g., antennas mounted on
the outside of a building or on a telephone pole, or any other outdoors
infrastructure is prohibited.
(3) The emissions from equipment operated under this section shall
not be intentionally directed outside of the building in which the
equipment is located, such as through a window or a doorway.
(4) Devices operating under the provisions of this section shall
bear the following or similar statement in a conspicuous location on the
device or in the instruction manual supplied with the device: ``This
equipment may only be operated indoors. Operation outdoors is in
violation of 47 U.S.C. 301 and could subject the operator to serious
(b) Operation under the provisions of this section is not permitted
on aircraft or satellites.
(c) Within the 92-95 GHz bands, the emission levels shall not exceed
(1) The average power density of any emission, measured during the
transmit interval, shall not exceed 9 uW/sq. cm, as measured at 3 meters
from the radiating structure, and the peak power density of any emission
shall not exceed 18 uW/sq. cm, as measured 3 meters from the radiating
(2) Peak power density shall be measured with an RF detector that
has a detection bandwidth that encompasses the band being used and has a
video bandwidth of at least 10 MHz, or uses an equivalent measurement
(3) The average emission limits shall be calculated based on the
measured peak levels, over the actual time period during which
(d) Limits on spurious emissions:
(1) The power density of any emissions outside the band being used
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.
(e) The total peak transmitter output power shall not exceed 500 mW.
(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
(g) Regardless of the maximum EIRP and maximum 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 47 CFR 1.1307(b), 2.1091, and 2.1093, 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.
[69 FR 3265, Jan. 23, 2004]