|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.
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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 F_Ultra-Wideband Operation
Sec. 15.503 Definitions.
(a) UWB bandwidth. For the purpose of this subpart, the UWB
bandwidth is the frequency band bounded by the points that are 10 dB
below the highest radiated emission, as based on the complete
transmission system including the antenna. The upper boundary is
designated fH and the lower boundary is designated
fL. The frequency at which the highest radiated emission
occurs is designated fM.
(b) Center frequency. The center frequency, fC, equals
(fH + fL)/2.
(c) Fractional bandwidth. The fractional bandwidth equals
2(fH-fL)/ (fH + fL).
(d) Ultra-wideband (UWB) transmitter. An intentional radiator that,
at any point in time, has a fractional bandwidth equal to or greater
than 0.20 or has a UWB bandwidth equal to or greater than 500 MHz,
regardless of the fractional bandwidth.
(e) Imaging system. A general category consisting of ground
penetrating radar systems, medical imaging systems, wall imaging systems
through-wall imaging systems and surveillance systems. As used in this
subpart, imaging systems do not include systems designed to detect the
location of tags or systems used to transfer voice or data information.
(f) Ground penetrating radar (GPR) system. A field disturbance
sensor that is designed to operate only when in contact with, or within
one meter of, the ground for the purpose of detecting or obtaining the
images of buried objects or determining the physical properties within
the ground. The energy from the GPR is intentionally directed down into
the ground for this purpose.
(g) Medical imaging system. A field disturbance sensor that is
designed to detect the location or movement of objects within the body
of a person or animal.
(h) Wall imaging system. A field disturbance sensor that is designed
to detect the location of objects contained within a ``wall'' or to
determine the physical properties within the ``wall.'' The ``wall'' is a
concrete structure, the side of a bridge, the wall of a mine or another
physical structure that is dense enough and thick enough to absorb the
majority of the signal transmitted by the imaging system. This category
of equipment does not include products such as ``stud locators'' that
are designed to locate objects behind gypsum, plaster or similar walls
that are not capable of absorbing the transmitted signal.
(i) Through-wall imaging system. A field disturbance sensor that is
designed to detect the location or movement of persons or objects that
are located on the other side of an opaque structure such as a wall or a
ceiling. This category of equipment may include products such as ``stud
locators'' that are designed to locate objects behind gypsum, plaster or
similar walls that are not thick enough or dense enough to absorb the
(j) Surveillance system. A field disturbance sensor used to
establish a stationary RF perimeter field that is used for security
purposes to detect the intrusion of persons or objects.
(k) EIRP. Equivalent isotropically radiated power, i.e., the product
of the power supplied to the antenna and the antenna gain in a given
direction relative to an isotropic antenna. The EIRP, in terms of dBm,
can be converted to a field strength, in dBuV/m at 3 meters, by adding
95.2. As used in this subpart, EIRP refers to the highest signal
strength measured in any direction and at any frequency from the UWB
device, as tested in accordance with the procedures specified in Sec.
15.31(a) and 15.523 of this chapter.
(l) Law enforcement, fire and emergency rescue organizations. As
used in this subpart, this refers to those parties eligible to obtain a
license from the FCC under the eligibility requirements specified in
Sec. 90.20(a)(1) of this chapter.
(m) Hand held. As used in this subpart, a hand held device is a
portable device, such as a lap top computer or a PDA, that is primarily
hand held while being operated and that does not employ a fixed