47 CFR 2.101 - Frequency and wavelength bands.

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§ 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.1

Footnote(s):
1 In the application of the ITU Radio Regulations, the Radiocommunication Bureau uses the following units:
kHz: For frequencies up to 28 000 kHz inclusive;
MHz: For frequencies above 28 000 kHz up to 10 500 MHz inclusive; and
GHz: For frequencies above 10 500 MHz.

Bandnumber Symbols Frequency range (lower limitexclusive, upper limit inclusive) Corresponding metric subdivision Metricabbreviations for the bands
Note 1: “Band N” (N = band number) extends from 0.3 × 10N Hz to 3 × 10N Hz.
Note 2: Prefix: k = kilo (103), M = mega (106), G = giga (109).
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
(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; 75 FR 62933, Oct. 13, 2010]

Title 47 published on 2013-10-01

The following are only the Rules published in the Federal Register after the published date of Title 47.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2014-11-06; vol. 79 # 215 - Thursday, November 6, 2014
    1. 79 FR 65906 - Expanding the Economic and Innovation Opportunities of Spectrum Through Incentive Auctions
      GPO FDSys XML | Text
      FEDERAL COMMUNICATIONS COMMISSION
      Clarification.
      Effective November 6, 2014.
      47 CFR Parts 0, 1, 2, 15, 27, 73, and 74

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United States Code
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Title 47 published on 2013-10-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 47 CFR 2 after this date.

  • 2014-11-06; vol. 79 # 215 - Thursday, November 6, 2014
    1. 79 FR 65906 - Expanding the Economic and Innovation Opportunities of Spectrum Through Incentive Auctions
      GPO FDSys XML | Text
      FEDERAL COMMUNICATIONS COMMISSION
      Clarification.
      Effective November 6, 2014.
      47 CFR Parts 0, 1, 2, 15, 27, 73, and 74