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.

   (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.


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---------------------------------
                                                    Frequency range
                                                      (lower limit       Corres
ponding metric        Metric
         Band number                Symbols         exclusive, upper         su
bdivision       abbreviations for
                                                    limit inclusive)
                    the bands
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---------------------------------
4............................  VLF.............  3 to 30 kHz..........  Myriame
tric waves....  B.Mam
5............................  LF..............  30 to 300 kHz........  Kilomet
ric waves.....  B.km
6............................  MF..............  300 to 3 000 kHz.....  Hectome
tric waves....  B.hm
7............................  HF..............  3 to 30 MHz..........  Decamet
ric waves.....  B.dam
8............................  VHF.............  30 to 300 MHz........  Metric
waves.........  B.m
9............................  UHF.............  300 to 3 000 MHz.....  Decimet
ric waves.....  B.dm
10...........................  SHF.............  3 to 30 GHz..........  Centime
tric waves....  B.cm
11...........................  EHF.............  30 to 300 GHz........  Millime
tric waves....  B.mm
12...........................  ................  300 to 3 000 GHz.....  Decimil
limetric waves  .................
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---------------------------------
Note 1: ``Band N'' (N = band number) extends from 0.3 x 10N Hz to 3 x 10N 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]