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FCC Part 15 Radio Frequency Devices
Section 15.303

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: 47CFR15.303]
[Page 830-831]
                       TITLE 47--TELECOMMUNICATION
      Subpart D_Unlicensed Personal Communications Service Devices
Sec. 15.303  Definitions.
    (a) Asynchronous devices. Devices that transmit RF energy at 
irregular time intervals, as typified by local area network data 
    (b) Coordinatable PCS device. PCS devices whose geographical area of 
operation is sufficiently controlled either by necessity of operation 
with a fixed infrastructure or by disabling mechanisms to allow adequate 
coordination of their locations relative to incumbent fixed microwave 
    (c) Emission bandwidth. For purposes of this subpart the emission 
bandwidth shall be determined by measuring the width of the signal 
between two points, one below the carrier center frequency and one above 
the carrier center frequency, that are 26 dB down relative to the 
maximum level of the modulated carrier. Compliance with the emissions 
limits is based on the use of measurement instrumentation employing a
[[Page 831]]
peak detector function with an instrument resolutions bandwidth 
approximately equal to 1.0 percent of the emission bandwidth of the 
device under measurement.
    (d) Isochronous devices. Devices that transmit at a regular 
interval, typified by time-division voice systems.
    (e) Noncoordinatable PCS device. A PCS device that is capable of 
randomly roaming and operating in geographic areas containing incumbent 
microwave facilities such that operation of the PCS device will 
potentially cause harmful interference to the incumbent microwave 
    (f) Peak transmit power. The peak power output as measured over an 
interval of time equal to the frame rate or transmission burst of the 
device under all conditions of modulation. Usually this parameter is 
measured as a conducted emission by direct connection of a calibrated 
test instrument to the equipment under test. If the device cannot be 
connected directly, alternative techniques acceptable to the Commission 
may be used.
    (g) Personal Communications Services (PCS) Devices [Unlicensed]. 
Intentional radiators operating in the frequency band 1920-1930 MHz that 
provide a wide array of mobile and ancillary fixed communication 
services to individuals and businesses.
    (h) Spectrum window. An amount of spectrum equal to the intended 
emission bandwidth in which operation is desired.
    (i) Sub-band. For purposes of this subpart the term sub-band refers 
to the spectrum allocated for isochronous or asynchronous transmission.
    (j) Thermal noise power. The noise power in watts defined by the 
formula N=kTB where N is the noise power in watts, K is Boltzmann's 
constant, T is the absolute temperature in degrees Kelvin (e.g., 295 
[deg]K) and B is the emission bandwidth of the device in hertz.
    (k) Time window. An interval of time in which transmission is 
[58 FR 59180, Nov. 8, 1993, as amended at 59 FR 32852, June 24, 1994; 60 
FR 13073, Mar. 10, 1995; 69 FR 62620, Oct. 27, 2004; 69 FR 77949, Dec. 
29, 2004]

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