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

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.

Band
number
Symbols Frequency range (lower limit
exclusive, upper limit inclusive)
Corresponding metric subdivision Metric
abbreviations
for 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 × 10 N Hz to 3 × 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.

Band No. Symbols (terms) 2 Frequency range (lower limit exclusive, upper limit inclusive) Corresponding metric subdivision Metric
abbreviations
for the bands
4 VLF (very low frequency) 3 to 30 kHz Myriametric waves B.Mam
5 LF (low frequency) 30 to 300 kHz Kilometric waves B.km
6 MF (medium frequency) 300 to 3,000 kHz Hectometric waves B.hm
7 HF (high frequency) 3 to 30 MHz Decametric waves B.dam
8 VHF (very high frequency) 30 to 300 MHz Metric waves B.m
9 UHF (ultra high frequency) 300 to 3,000 MHz Decimetric waves B.dm
10 SHF (super high frequency) 3 to 30 GHz Centimetric waves B.cm
11 EHF (extremely high frequency) 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 × 10 N Hz to 3 × 10 N Hz.

NOTE 2: Prefix: k = kilo (10 3), M = mega (10 6), G = giga (10 9).

[70 FR 46583, Aug. 10, 2005; 70 FR 53074, Sept. 7, 2005; 75 FR 62933, Oct. 13, 2010; 80 FR 38823, July 7, 2015]

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United States Code
Statutes at Large

Title 47 published on 2015-10-01

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

  • 2015-11-30; vol. 80 # 229 - Monday, November 30, 2015
    1. 80 FR 74742 - Petitions for Reconsideration of Action in Rulemaking Proceeding
      GPO FDSys XML | Text
      FEDERAL COMMUNICATIONS COMMISSION
      Petitions for reconsideration.
      Oppositions to the Petitions must be filed on or before December 15, 2015. Replies to an opposition must be filed on or before December 28, 2015.
      47 CFR Parts 0, 1, 2 and 15