U.S. Non-Federal-Government Allocations
BROADCASTING
FCC rule parts
SpectrumWiki
Radio spectrum allocations
Look up a frequency or a range.
Examples: 88.5 MHz, 1350–1430 MHz, 2.4 GHz
1.604999 MHz (1,604,999 Hz)
U.S. Federal Government Allocations
ITU Region 1 Allocations
BROADCASTING
ITU Region 2 Allocations
BROADCASTING
ITU Region 3 Allocations
BROADCASTING
Footnotes
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5.87 Additional allocation: in Angola, Botswana, Eswatini, Lesotho, Malawi, Mozambique, Namibia and Niger, the frequency band 526.5-535 kHz is also allocated to the mobile service on a secondary basis. (WRC 19)
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5.87A Additional allocation: in Uzbekistan, the band 526.5-1 606.5 kHz is also allocated to the radionavigation service on a primary basis. Such use is subject to agreement obtained under No. 9.21 with administrations concerned and limited to ground-based radiobeacons in operation on 27 October 1997 until the end of their lifetime. (WRC-97)
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NG1 The band 535-1705 kHz is also allocated to the mobile service on a secondary basis for the distribution of public service information from Travelers Information Stations operating in accordance with the provisions of 47 CFR 90.242 on 10 kilohertz spaced channels from 540 kHz to 1700 kHz.
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NG5 In the band 535-1705 kHz, AM broadcast licensees and permittees may use their AM carrier on a secondary basis to transmit signals intended for both broadcast and non-broadcast purposes. In the band 88-108 MHz, FM broadcast licensees and permittees are permitted to use subcarriers on a secondary basis to transmit signals intended for both broadcast and non-broadcast purposes. In the bands 54-72, 76-88, 174-216, 470-608, and 614-698 MHz, TV broadcast licensees and permittees are permitted to use subcarriers on a secondary basis for both broadcast and non-broadcast purposes. Use of the band 614-698 MHz is subject to the provisions specified in NG33.
Wiki entries
AM Broadcast Band
Current Use
535 kHz–1.705 MHz AM Broadcast
The band 535-1705 kHz is used for AM broadcast in the U.S. (among other countries). Stations are assigned center frequencies every 10 kHz starting at 540 kHz and ending at 1700 kHz, and each analog broadcast has a bandwidth of approximately 5 kHz. There is a total of 117 available AM broadcast frequencies in the band.
Because radio signals in this range can travel a long distance by bouncing off the ionosphere (especially at night, when the densest parts of the ionosphere are at very high altitude), careful frequency coordination of the AM broadcast band is required. Some stations are required to reduce power at night, or go off the air completely, to avoid interference to other stations using the same frequency.
Some AM stations are also transmiting an "In-Band, On-Channel" (IBOC) digital signal, which is implemented using far-out sidebands of the analog signal. Digital broadcasting has not had a large uptake in the U.S., and there are lingering problems and concerns with the digital sidebands creating interference to other stations, especially at night when propagation can reach great distances.
Because radio signals in this range can travel a long distance by bouncing off the ionosphere (especially at night, when the densest parts of the ionosphere are at very high altitude), careful frequency coordination of the AM broadcast band is required. Some stations are required to reduce power at night, or go off the air completely, to avoid interference to other stations using the same frequency.
Some AM stations are also transmiting an "In-Band, On-Channel" (IBOC) digital signal, which is implemented using far-out sidebands of the analog signal. Digital broadcasting has not had a large uptake in the U.S., and there are lingering problems and concerns with the digital sidebands creating interference to other stations, especially at night when propagation can reach great distances.
AM Broadcast Band
Current Use
535 kHz–1.705 MHz AM Broadcast
The band 535-1705 kHz is used for AM broadcast in the U.S. (among other countries). Stations are assigned center frequencies every 10 kHz starting at 540 kHz and ending at 1700 kHz, and each analog broadcast has a bandwidth of approximately 5 kHz. There is a total of 117 available AM broadcast frequencies in the band.
Because radio signals in this range can travel a long distance by bouncing off the ionosphere (especially at night, when the densest parts of the ionosphere are at very high altitude), careful frequency coordination of the AM broadcast band is required. Some stations are required to reduce power at night, or go off the air completely, to avoid interference to other stations using the same frequency.
Some AM stations are also transmiting an "In-Band, On-Channel" (IBOC) digital signal, which is implemented using far-out sidebands of the analog signal. Digital broadcasting has not had a large uptake in the U.S., and there are lingering problems and concerns with the digital sidebands creating interference to other stations, especially at night when propagation can reach great distances.
As of March, 2012, there were 4,762 AM broadcast stations on the air in the U.S., or about 41 stations per channel on average.
Because radio signals in this range can travel a long distance by bouncing off the ionosphere (especially at night, when the densest parts of the ionosphere are at very high altitude), careful frequency coordination of the AM broadcast band is required. Some stations are required to reduce power at night, or go off the air completely, to avoid interference to other stations using the same frequency.
Some AM stations are also transmiting an "In-Band, On-Channel" (IBOC) digital signal, which is implemented using far-out sidebands of the analog signal. Digital broadcasting has not had a large uptake in the U.S., and there are lingering problems and concerns with the digital sidebands creating interference to other stations, especially at night when propagation can reach great distances.
As of March, 2012, there were 4,762 AM broadcast stations on the air in the U.S., or about 41 stations per channel on average.