U.S. Non-Federal-Government Allocations
AMATEUR
FCC rule parts
SpectrumWiki
Radio spectrum allocations
Look up a frequency or a range.
Examples: 88.5 MHz, 1350–1430 MHz, 2.4 GHz
3.5 MHz (3,500,000 Hz)
U.S. Federal Government Allocations
ITU Region 1 Allocations
AMATEUR
FIXED
MOBILE except aeronautical mobile
ITU Region 2 Allocations
AMATEUR
ITU Region 3 Allocations
AMATEUR
FIXED
MOBILE
Footnotes
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5.92 Some countries of Region 1 use radiodetermination systems in the bands 1 606.5 1 625 kHz, 1 635 1 800 kHz, 1 850-2 160 kHz, 2 194-2 300 kHz, 2 502-2 850 kHz and 3 500-3 800 kHz, subject to agreement obtained under No. 9.21. The radiated mean power of these stations shall not exceed 50 W.
- 5.119
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US340 The band 2-30 MHz is available on a non-interference basis to Federal and non-Federal maritime and aeronautical stations for the purposes of measuring the quality of reception on radio channels. See 47 CFR 87.149 for the list of protected frequencies and bands within this frequency range. Actual communications shall be limited to those frequencies specifically allocated to the maritime mobile and aeronautical mobile services.
Wiki entries
Access Broadband over Power Line (Access BPL)
Current Use
3.5–4.65 MHz Access BPL
According to the FCC's definition, Access BPL is "a carrier current system installed and operated on an electric utility service as an unintentional radiator that sends radio frequency energy on frequencies between 1.705 MHz and 80 MHz over medium voltage lines or over low voltage lines to provide broadband communications and is located on the supply side of the utility service’s points of interconnection with customer premises. Access BPL does not include power line carrier systems as defined in § 15.3(t) or In-House BPL as defined in § 15.3(gg)."
Low voltage lines are defined as lines carrying, for example, 240/120 volts from a distribution transformer to a customer's premises. Medium voltage lines carry between 1,000 and 40,000 volts from a power substation to neighborhoods, and may be overhead or underground.
Access BPL is an unlicensed service operated under Subpart G of Part 15 of the FCC's rules. Radiated emission limits from medium voltage lines in the 1.705-30 MHz range must not exceed the limits in 47 CFR 15.209, and those from 30-80 MHz must not exceed the limits in 15.109(b). Systems that operate on low voltage lines must comply with 15.109(a) limits across the entire 1.705-80 MHz range.
When Access BPL systems must use notch filters to protect licensed services, the notch must be at least 25 dB below applicable Part 15 limits in the 1.705-30 MHz band, and at least 10 dB below the limits in the 30-80 MHz band.
There are 12 sub-bands in which Access BPL systems are not allowed to operate anywhere to protect aeronautical (land) stations and aircraft receivers. Those excluded bands are listed in 15.615(f), and are excluded in the list of Access BPL bands in this entry.
Access BPL systems are not allowed to operate within the sub-band 2173.5-2190.5 kHz within 1 km of coast station facilities listed in 47 CFR 15.615(f)(2)(i), to protect the internationally-recognized standard maritime calling frequency of 2182 kHz.
No Access BPL emissions are allowed in the 73.0-74.6 MHz radio astronomy band on overhead medium voltage lines within 65 km of the Very Large Array radio telescope in New Mexico (34 04 43.5N, 107 37 03.82W), or within 47 km of the VLA on underground power lines or overhead low voltage lines.
Access BPL operators must consult at least 30 days in advance when deploying systems near various FCC field offices, aeronautical and maritime stations, radar systems, radio astronomy stations, and research areas. Details are in 47 CFR 15.615(f)(3).
Low voltage lines are defined as lines carrying, for example, 240/120 volts from a distribution transformer to a customer's premises. Medium voltage lines carry between 1,000 and 40,000 volts from a power substation to neighborhoods, and may be overhead or underground.
Access BPL is an unlicensed service operated under Subpart G of Part 15 of the FCC's rules. Radiated emission limits from medium voltage lines in the 1.705-30 MHz range must not exceed the limits in 47 CFR 15.209, and those from 30-80 MHz must not exceed the limits in 15.109(b). Systems that operate on low voltage lines must comply with 15.109(a) limits across the entire 1.705-80 MHz range.
When Access BPL systems must use notch filters to protect licensed services, the notch must be at least 25 dB below applicable Part 15 limits in the 1.705-30 MHz band, and at least 10 dB below the limits in the 30-80 MHz band.
There are 12 sub-bands in which Access BPL systems are not allowed to operate anywhere to protect aeronautical (land) stations and aircraft receivers. Those excluded bands are listed in 15.615(f), and are excluded in the list of Access BPL bands in this entry.
Access BPL systems are not allowed to operate within the sub-band 2173.5-2190.5 kHz within 1 km of coast station facilities listed in 47 CFR 15.615(f)(2)(i), to protect the internationally-recognized standard maritime calling frequency of 2182 kHz.
No Access BPL emissions are allowed in the 73.0-74.6 MHz radio astronomy band on overhead medium voltage lines within 65 km of the Very Large Array radio telescope in New Mexico (34 04 43.5N, 107 37 03.82W), or within 47 km of the VLA on underground power lines or overhead low voltage lines.
Access BPL operators must consult at least 30 days in advance when deploying systems near various FCC field offices, aeronautical and maritime stations, radar systems, radio astronomy stations, and research areas. Details are in 47 CFR 15.615(f)(3).
Amateur Radio 80 m Band
Current Use
3.5–3.8 MHz Amateur Radio 80 m Band (ITU Region 1)
3.5–3.9 MHz Amateur Radio 80 m Band (ITU Region 3)
3.5–4 MHz Amateur Radio 80 m Band (ITU Region 2)
According to the ITU, "this band is used for contacts over distances of up to 500 km during the day, and for distances of 2 000 km and more at night. It is heavily used during communications emergencies."
Sometimes the upper portion of this band, which is mostly used for SSB communications, is referred to as 75 m, while the lower portion, used for CW and narrowband digital modes, is referred to as 80 m.
In the U.S., the ARRL has adopted the following band plan. The plan may apply in other countries as well. Following the band plan are the band segments that are authorized for the specified U.S. licensee classes.
ARRL BAND PLAN:
Band Uses Authorized for AMATEUR EXTRA Class Licensees:
Band Uses Authorized for ADVANCED Class Licensees:
Band Uses Authorized for GENERAL Class Licensees:
Band Uses Authorized for TECHNICIAN and NOVICE Class Licensees (200 W MAX):
Sometimes the upper portion of this band, which is mostly used for SSB communications, is referred to as 75 m, while the lower portion, used for CW and narrowband digital modes, is referred to as 80 m.
In the U.S., the ARRL has adopted the following band plan. The plan may apply in other countries as well. Following the band plan are the band segments that are authorized for the specified U.S. licensee classes.
ARRL BAND PLAN:
| Frequency (kHz) | Use |
| 3590 | RTTY/Data DX |
| 3570-3600 | RTTY/Data |
| 3790-3800 | DX window |
| 3845 | SSTV |
| 3885 | AM calling frequency |
Band Uses Authorized for AMATEUR EXTRA Class Licensees:
| Range (kHz) | Authorized Use(s) |
| 3500-3600 | RTTY and data |
| 3600-4000 | Phone and image |
Band Uses Authorized for ADVANCED Class Licensees:
| Range (kHz) | Authorized Use(s) |
| 3525-3600 | RTTY and data |
| 3700-4000 | Phone and image |
Band Uses Authorized for GENERAL Class Licensees:
| Range (kHz) | Authorized Use(s) |
| 3525-3600 | RTTY and data |
| 3800-4000 | Phone and image |
Band Uses Authorized for TECHNICIAN and NOVICE Class Licensees (200 W MAX):
| Range (kHz) | Authorized Use(s) |
| 3525-3600 | CW only |