[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: 47CFR2.101]

[Page 457-458]
 
                       TITLE 47--TELECOMMUNICATION
 
              CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION
 
PART 2_FREQUENCY ALLOCATIONS AND RADIO TREATY MATTERS; GENERAL RULES 
AND REGULATIONS--Table of Contents
 
     Subpart B_Allocation, Assignment, and Use of Radio Frequencies
 
Sec. 2.101  Frequency and wavelength bands.

    (a) The radio spectrum shall be subdivided into nine frequency 
bands, which shall be designated by progressive whole numbers in 
accordance with the following table. As the unit of frequency is the 
hertz (Hz), frequencies shall be expressed:
    (1) In kilohertz (kHz), up to and including 3 000 kHz;
    (2) In megahertz (MHz), above 3 MHz, up to and including 3 000 MHz;
    (3) In gigahertz (GHz), above 3 GHz, up to and including 3 000 GHz.

[[Page 458]]

    (b) However, where adherence to these provisions would introduce 
serious difficulties, for example in connection with the notification 
and registration of frequencies, the lists of frequencies and related 
matters, reasonable departures may be made.

----------------------------------------------------------------------------------------------------------------
                                                        Frequency range
                                                         (lower limit        Corresponding          Metric
          Band  number                  Symbols        exclusive, upper   metric subdivision  abbreviations  for
                                                       limit inclusive)                            the bands
----------------------------------------------------------------------------------------------------------------
4...............................  VLF...............  3 to 30 kHz.......  Myriametric waves.  B.Mam
5...............................  LF................  30 to 300 kHz.....  Kilometric waves..  B.km
6...............................  MF................  300 to 3 000 kHz..  Hectometric waves.  B.hm
7...............................  HF................  3 to 30 MHz.......  Decametric waves..  B.dam
8...............................  VHF...............  30 to 300 MHz.....  Metric waves......  B.m
9...............................  UHF...............  300 to 3 000 MHz..  Decimetric waves..  B.dm
10..............................  SHF...............  3 to 30 GHz.......  Centimetric waves.  B.cm
11..............................  EHF...............  30 to 300 GHz.....  Millimetric waves.  B.mm
12..............................  ..................  300 to 3 000 GHz..  Decimillimetric     ..................
                                                                           waves.
----------------------------------------------------------------------------------------------------------------
Note 1: ``Band N'' (N = band number) extends from 0.3 x 10\N\ Hz to 3 x 10\N\ Hz.
Note 2: Prefix: k = kilo (10\3\), M = mega (10\6\), G = giga (10\9\).

    (c) In communications between administrations and the ITU, no names, 
symbols or abbreviations should be used for the various frequency bands 
other than those specified in this section.

[70 FR 46583, Aug. 10, 2005; 70 FR 53074, Sept. 7, 2005]