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Allocations

Intro to Allocations

U.S. Non-Federal-Government Allocations

13.36 - 13.41 MHz
RADIO ASTRONOMY

US342

U.S. Federal Government Allocations

13.36 - 13.41 MHz
RADIO ASTRONOMY

US342 G115

ITU Region 1 Allocations

13.36 - 13.41 MHz
FIXED
RADIO ASTRONOMY

5.149

ITU Region 2 Allocations

13.36 - 13.41 MHz
FIXED
RADIO ASTRONOMY

5.149

ITU Region 3 Allocations

13.36 - 13.41 MHz
FIXED
RADIO ASTRONOMY

5.149

SpectrumWiki

Radio Astronomy (13.36 - 13.41 MHz)

Access Broadband over Power Line (Access BPL)

Footnotes

5.149 In making assignments to stations of other services to which the bands:

13360-13410 kHz,	22.81-22.86 GHz,
25550-25670 kHz,	23.07-23.12 GHz,
37.5-38.25 MHz,	31.2-31.3 GHz,
73-74.6 MHz	31.5-31.8 GHz
in Regions 1 and 3,	in Regions 1 and 3,
150.05-153 MHz	36.43-36.5 GHz,
in Region 1,	42.5-43.5 GHz,
322-328.6 MHz,	48.94-49.04 GHz,
406.1-410 MHz,	76-86 GHz,
608-614 MHz in	92-94 GHz,
Regions 1 and 3,	94.1-100 GHz,
1330-1400 MHz,	102-109.5 GHz,
1610.6-1613.8 MHz,	111.8-114.25 GHz,
1660-1670 MHz,	128.33-128.59 GHz,
1718.8-1722.2 MHz,	129.23-129.49 GHz,
2655-2690 MHz,	130-134 GHz,
3260-3267 MHz,	136-148.5 GHz,
3332-3339 MHz,	151.5-158.5 GHz,
3345.8-3352.5 MHz,	168.59-168.93 GHz,
4825-4835 MHz,	171.11-171.45 GHz,
4950-4990 MHz,	172.31-172.65 GHz,
4990-5000 MHz,	173.52-173.85 GHz,
6650-6675.2 MHz,	195.75-196.15 GHz,
10.6-10.68 GHz,	209-226 GHz,
14.47-14.5 GHz,	241-250 GHz,
22.01-22.21 GHz,	252-275 GHz
22.21-22.5 GHz,

are allocated, administrations are urged to take all practicable steps to protect the radio astronomy service from harmful interference. Emissions from spaceborne or airborne stations can be particularly serious sources of interference to the radio astronomy service (see Nos. 4.5 and 4.6 and Article 29). (WRC-07)

US342 In making assignments to stations of other services to which the bands:

13360-13410 kHz	42.77-42.87 GHz*
25550-25670 kHz	43.07-43.17 GHz*
37.5-38.25 MHz	43.37-43.47 GHz*
322-328.6 MHz*	48.94-49.04 GHz*
1330-1400 MHz*	76-86 GHz
1610.6-1613.8 MHz*	92-94 GHz
1660-1660.5 MHz*	94.1-100 GHz
1668.4-1670 MHz*	102-109.5 GHz
3260-3267 MHz*	111.8-114.25 GHz
3332-3339 MHz*	128.33-128.59 GHz*
3345.8-3352.5 MHz*	129.23-129.49 GHz*
4825-4835 MHz*	130-134 GHz
4950-4990 MHz	136-148.5 GHz
6650-6675.2 MHz*	151.5-158.5 GHz
14.47-14.5 GHz*	168.59-168.93 GHz*
22.01-22.21 GHz*	171.11-171.45 GHz*
22.21-22.5 GHz	172.31-172.65 GHz*
22.81-22.86 GHz*	173.52-173.85 GHz*
23.07-23.12 GHz*	195.75-196.15 GHz*
31.2-31.3 GHz	209-226 GHz
36.43-36.5 GHz*	241-250 GHz
42.5-43.5 GHz	252-275 GHz

are allocated (*indicates radio astronomy use for spectral line observations), all practicable steps shall be taken to protect the radio astronomy service from harmful interference. Emissions from spaceborne or airborne stations can be particularly serious sources of interference to the radio astronomy service (see ITU Radio Regulations at Nos. 4.5 and 4.6 and Article 29).

G115 In the band 13360-13410 kHz, the fixed service is allocated on a primary basis outside the conterminous United States. Within the conterminous United States, assignments in the fixed service are permitted, and will be protected for national defense purposes or, if they are to be used only in an emergency jeopardizing life, public safety, or important property under conditions calling for immediate communication where other means of communication do not exist.

SpectrumWiki

Radio Astronomy (13.36 - 13.41 MHz)

The band 13.36 - 13.41 MHz is the lowest frequency band allocated to the radio astronomy service. It is allocated on a primary basis in the U.S. and in all three ITU regions.

One radio astronomy facility that is being designed to make use of frequencies in this range is the Long Wavelength Array (LWA), which is co-located with the Very Large Array near Socorro, NM. The LWA design range is 10-88 MHz, with the main science goals and observing targets being relativistic particles in space (including supernova remnants, radio galaxies, and cosmic rays); cosmic evolution and the high-redshift universe; plasma astrophysics and space science; and transient cosmic radio sources.

Two major factors make radio astronomy at this low frequency very difficult. First, under normal conditions, the ionosphere heavily absorbs radio signals in this frequency range. Radio signals that are not absorbed will suffer strong and time-variable distortions due to density fluctations and motion of ionized material in the ionosphere.

Second, due to long-distance propagation of terrestrial radio signals in this range, radio frequency interference is a substantial problem, even for radio telescopes that are located at very remote sites. Within all three ITU regions, the band is shared with the fixed service.

Frequency Bands
Band	Use	Service	Table
13360 - 13410 kHz	Radio Astronomy (13.36-13.41 MHz)	Radio Astronomy	-

External Links:

Long Wavelength Array

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Access Broadband over Power Line (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).

Frequency Bands
Band	Use	Service	Table
1705 - 2850 kHz	Access BPL	-	-
3025 - 3400 kHz	Access BPL	-	-
3500 - 4650 kHz	Access BPL	-	-
4700 - 5450 kHz	Access BPL	-	-
5680 - 6525 kHz	Access BPL	-	-
6685 - 8815 kHz	Access BPL	-	-
8965 - 10005 kHz	Access BPL	-	-
10100 - 11275 kHz	Access BPL	-	-
11400 - 13260 kHz	Access BPL	-	-
13360 - 17900 kHz	Access BPL	-	-
17970 - 21924 kHz	Access BPL	-	-
22000 kHz - 74.8 MHz	Access BPL	-	-
75.2 - 80 MHz	Access BPL	-	-

External Links:

BPL (CommLawBlog)

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Long Wavelength Array

Engineering Data

	Lower Frequency	Center Frequency	Upper Frequency
Frequency	13360 kHz	13385 kHz	13410 kHz
Wavelength	22.4 m	22.4 m	22.4 m
Band designator(s)	HF	HF	HF
Isotropic collecting area	40.1 m²	39.9 m²	39.8 m²
Free space loss (1 m)	N/A (near field)	N/A (near field)	N/A (near field)
Free space loss (1 km)	55.0 dB	55.0 dB	55.0 dB
Free space loss (10 km)	75.0 dB	75.0 dB	75.0 dB
Free space loss (100 km)	95.0 dB	95.0 dB	95.0 dB
Free space loss (1000 km)	115.0 dB	115.0 dB	115.0 dB
Free space loss (35,786 km = GEO orbit)	146.0 dB	146.1 dB	146.1 dB
Free space loss (378,370 km = Moon)	166.5 dB	166.5 dB	166.6 dB