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Allocations

Intro to Allocations

U.S. Non-Federal-Government Allocations

400.05 - 400.15 MHz
STANDARD FREQUENCY AND TIME SIGNAL-SATELLITE (400.1 MHz)

5.261

U.S. Federal Government Allocations

400.05 - 400.15 MHz
STANDARD FREQUENCY AND TIME SIGNAL-SATELLITE (400.1 MHz)

5.261

ITU Region 1 Allocations

400.05 - 400.15 MHz
STANDARD FREQUENCY AND TIME SIGNAL-SATELLITE (400.1 MHz)

5.261 5.262

ITU Region 2 Allocations

400.05 - 400.15 MHz
STANDARD FREQUENCY AND TIME SIGNAL-SATELLITE (400.1 MHz)

5.261 5.262

ITU Region 3 Allocations

400.05 - 400.15 MHz
STANDARD FREQUENCY AND TIME SIGNAL-SATELLITE (400.1 MHz)

5.261 5.262

SpectrumWiki

Band Uses (400.05 - 400.15 MHz)

WRC-19 Agenda Item 1.2

Radiosondes

Space operations

IEEE 802.15.4 HRP UWB

Footnotes

5.261 Emissions shall be confined in a band of ± 25 kHz about the standard frequency 400.1 MHz.

5.262 Additional allocation: in Saudi Arabia, Armenia, Azerbaijan, Bahrain, Belarus, Botswana, Colombia, Cuba, Egypt, the United Arab Emirates, Ecuador, the Russian Federation, Georgia, Hungary, Iran (Islamic Republic of), Iraq, Israel, Jordan, Kazakhstan, Kuwait, Liberia, Malaysia, Moldova, Oman, Uzbekistan, Pakistan, the Philippines, Qatar, the Syrian Arab Republic, Kyrgyzstan, Singapore, Somalia, Tajikistan, Chad, Turkmenistan and Ukraine, the band 400.05-401 MHz is also allocated to the fixed and mobile services on a primary basis. (WRC 12)

SpectrumWiki

Band Uses (400.05 - 400.15 MHz)

WRC-19 Agenda Item 1.2

1.2 to consider in-band power limits for earth stations operating in the mobile-satellite service, meteorological-satellite service and Earth exploration-satellite service in the frequency bands 401-403 MHz and 399.9-400.05 MHz, in accordance with Resolution 765 [COM6/7] (WRC-15);

Frequency Bands
Band	Use	Service	Table
399.9 - 400.05 MHz	WRC-19 Agenda Item 1.2	-	-
401 - 403 MHz	WRC-19 Agenda Item 1.2	-	-

External Links:

WRC-19 (International Telecommunication Union)

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Radiosondes

According to the U.S. National Weather Service:

In order to understand the dynamic processes that result in the weather we experience, we need to know what is happening through the entire atmosphere. These observations are primarily taken with the aid of radiosondes.

The radiosonde is a small instrument package that is suspended below balloon filled with either hydrogen or helium. As the radiosonde is carried aloft, it measures pressure, temperature, and relative humidity.

These sensors are linked to a battery-powered radio transmitter that sends the information to a ground receiver. By tracking the position of the radiosonde in flight via GPS (Global Positioning System), measurements of wind speed and direction aloft is also obtained.

Worldwide, most radiosonde observations are taken daily at 00Z and 12Z (6 a.m. and 6 p.m. EST). With worldwide coordination of these upper air observations, we can obtain a picture of the various pressure and wind patterns across the globe.

Radiosonde observations technically provide only pressure, temperature, and relative humidity data; the tracked position of a radiosonde is actually called a rawinsonde observation and is used to obtain wind speed and direction. However, meteorologists and other data users frequently refer to them as part of the radiosonde observation.

The radiosonde flight can last in excess of two hours, and during this time the radiosonde can ascend to over 115,000 feet (35,000 m) and drift more than 125 miles (200 km) from the release point. During the flight, the radiosonde is exposed to temperatures as cold as -130°F (-92°C) and air pressures of only a few hundredths of what is found on the Earth's surface.

When the balloon has expanded beyond its elastic limit (20-25 feet in diameter) and bursts, the radiosonde returns to Earth via a small parachute. This slows its descent, minimizing the danger to life and property.

If found, radiosondes are safe to handle, as long as the balloon is deflated. Cut the string to the balloon/parachute and place them in a trash receptacle. You may also dispose of the radiosonde itself or keep it.

Worldwide, there are about 1,300 upper-air stations. Observations are made by the NWS at 92 stations: 69 in the conterminous United States, 13 in Alaska, nine in the Pacific, and one in Puerto Rico.

NWS supports the operation of 10 other stations in the Caribbean. Through international agreements, data are exchanged between countries worldwide.

Frequency Bands
Band	Use	Service	Table
400.15 - 406 MHz	Radiosondes	Meteorological Aids	F
1675 - 1685 MHz	Radiosondes	Meteorological Aids	F

External Links:

Radiosondes (U.S. National Weather Service)

Associated Files:

A Lockheed Martin Mark IIA Microsonde (radiosonde).

Preparing to launch a radiosonde (Reno, NV area).

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Space operations

In FCC 23-76 (2023), the FCC modified their rules to increase the amount of spectrum available to non-government space operations:

"[W]e adopt a new secondary allocation in the 2025-2110 MHz band for non-Federal space operations, remove the restriction on use of the 2200-2290 MHz secondary non-Federal space operation allocation to four specific sub channels to make the entire 2200-2290 MHz band available, add a non Federal secondary mobile allocation to the 2200-2290 MHz band, and adopt licensing and technical rules for space launch operations. Additionally, we amend the allocation for the 399.9-400.05 MHz band to permit the deployment of Federal space stations. We also seek further comment on whether to adopt licensing and operating rules for payload activities as well as on modifying our existing 2360-2395 MHz space launch rules and on possible additional licensing provisions for sub-orbital launch vehicles. These actions will encourage the continued development of a robust U.S. commercial space sector to the benefit of national interests in security, prosperity, and science."

Frequency Bands
Band	Use	Service	Table
399.9 - 400.05 MHz	Federal space stations	Mobile-satellite	F
2025 - 2110 MHz	Non-federal space operations	Space Operation	N
2200 - 2290 MHz	Non-federal space operations	Space Operation	N
2360 - 2395 MHz	Possible space operation allocation	Space Operation	N

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IEEE 802.15.4 HRP UWB

High pulse repetition frequency ultra-wideband (HPR UWB) is one of the physical layers defined for low data rate personal area network (LR-WPAN) communications in the IEEE 802.15.4 standard.

According to the FiRa Consortium:

"In challenging environments, such as parking structures, hospitals, airports and high density venues, ultra-wideband (UWB) technology outperforms other technologies in terms of accuracy, power consumption, robustness in wireless connectivity, and security, by a wide margin.

"UWB securely determines the relative position of peer devices with a very high degree of accuracy and can operate with line of sight at up to 200 meters. In contrast to narrow band wireless technologies, the use of wide bandwidth means UWB provides very stable connectivity, with little to no interference and offers highly precise positioning, even in congested multi-path signal environments.

"By calculating precise location, fine ranging based on UWB is a more secure approach to closing and opening locks, whether those locks are installed on a car door, a warehouse entryway, a conference room, or your front door."

Frequencies
Frequency	Bandwidth	Use	Service	Table
499.2 MHz	499.2 MHz	802.15.4 HRP UWB Channel 0	-	-
3494.4 MHz	499.2 MHz	802.15.4 HRP UWB Channel 1	-	-
3993.6 MHz	499.2 MHz	802.15.4 HRP UWB Channel 2	-	-
3993.6 MHz	1.3312 GHz	802.15.4 HRP UWB Channel 4	-	-
4492.8 MHz	499.2 MHz	802.15.4 HRP UWB Channel 3	-	-
6489.6 MHz	1.0816 GHz	802.15.4 HRP UWB Channel 7	-	-
6489.6 MHz	499.2 MHz	802.15.4 HRP UWB Channel 5	-	-
6988.8 MHz	499.2 MHz	802.15.4 HRP UWB Channel 6	-	-
7488 MHz	499.2 MHz	802.15.4 HRP UWB Channel 8	-	-
7987.2 MHz	1.3312 GHz	802.15.4 HRP UWB Channel 11	-	-
7987.2 MHz	499.2 MHz	802.15.4 HRP UWB Channel 9	-	-
8486.4 MHz	499.2 MHz	802.15.4 HRP UWB Channel 10	-	-
8985.6 MHz	499.2 MHz	802.15.4 HRP UWB Channel 12	-	-
9484.8 MHz	1.35497 GHz	802.15.4 HRP UWB Channel 15	-	-
9484.8 MHz	499.2 MHz	802.15.4 HRP UWB Channel 13	-	-
9984 MHz	499.2 MHz	802.15.4 HRP UWB Channel 14	-	-

External Links:

IEEE 802.15.4 standard (IEEE)

IEEE 802.15.4 (Wikipedia)

Associated Files:

802.15.4 HRP UWB PHY band allocation

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Occupancy Measurements (10)

Engineering Data

	Lower Frequency	Center Frequency	Upper Frequency
Frequency	400.05 MHz	400.1 MHz	400.15 MHz
Wavelength	74.9 cm	74.9 cm	74.9 cm
Band designator(s)	UHF	UHF	UHF
Isotropic collecting area	446.9 cm²	446.8 cm²	446.7 cm²
Free space loss (1 m)	24.5 dB	24.5 dB	24.5 dB
Free space loss (1 km)	84.5 dB	84.5 dB	84.5 dB
Free space loss (10 km)	104.5 dB	104.5 dB	104.5 dB
Free space loss (100 km)	124.5 dB	124.5 dB	124.5 dB
Free space loss (1000 km)	144.5 dB	144.5 dB	144.5 dB
Free space loss (35,786 km = GEO orbit)	175.6 dB	175.6 dB	175.6 dB
Free space loss (378,370 km = Moon)	196.1 dB	196.1 dB	196.1 dB