47 C.F.R. § 2.101 Frequency and wavelength bands.
Title 47 - Telecommunication
(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. (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]
Title 47: Telecommunication
PART 2—FREQUENCY ALLOCATIONS AND RADIO TREATY MATTERS; GENERAL RULES AND REGULATIONS
Subpart B—Allocation, Assignment, and Use of Radio Frequencies
§ 2.101 Frequency and wavelength bands.
---------------------------------------------------------------------------------------------------------------- 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.Mam5............................... LF................ 30 to 300 kHz..... Kilometric waves.. B.km6............................... MF................ 300 to 3 000 kHz.. Hectometric waves. B.hm7............................... HF................ 3 to 30 MHz....... Decametric waves.. B.dam8............................... VHF............... 30 to 300 MHz..... Metric waves...... B.m9............................... UHF............... 300 to 3 000 MHz.. Decimetric waves.. B.dm10.............................. SHF............... 3 to 30 GHz....... Centimetric waves. B.cm11.............................. EHF............... 30 to 300 GHz..... Millimetric waves. B.mm12.............................. .................. 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\).
