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FCC Part 15 Radio Frequency Devices
Section 15.503

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: 47CFR15.503]
[Page 839-840]
                       TITLE 47--TELECOMMUNICATION
                   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.
[[Page 840]]
    (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 
transmitted signal.
    (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 

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