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Allocations

U.S. Non-Federal-Government Allocations

8400 - 8450 MHz
Space research (deep space)(space-to-Earth)

U.S. Federal Government Allocations

8400 - 8450 MHz
FIXED
SPACE RESEARCH (deep space)(space-to-Earth)

ITU Region 1 Allocations

8400 - 8500 MHz
FIXED
MOBILE except aeronautical mobile
SPACE RESEARCH (space-to-Earth) 5.465 5.466

ITU Region 2 Allocations

8400 - 8500 MHz
FIXED
MOBILE except aeronautical mobile
SPACE RESEARCH (space-to-Earth) 5.465 5.466

ITU Region 3 Allocations

8400 - 8500 MHz
FIXED
MOBILE except aeronautical mobile
SPACE RESEARCH (space-to-Earth) 5.465 5.466

SpectrumWiki

NASA Deep Space Network (DSN)

Wideband Global SATCOM (WGS) System

Defense Satellite Communication System 3 (DSCS III)

Possible new FSS and maritime mobile-satellite allocations, 2015 World Radiocommunication Conference (WRC-15) Agenda Item 1.9

Possible allocations for FSS and maritime mobile-satellite service, 2015 World Radiocommunication Conference (WRC-15) Agenda Item 1.9

Footnotes

5.465 In the space research service, the use of the band 8400-8450 MHz is limited to deep space.

5.466 Different category of service: in Israel, Singapore and Sri Lanka, the allocation of the band 8400-8500 MHz to the space research service is on a secondary basis (see No. 5.32).

SpectrumWiki

NASA Deep Space Network (DSN)

According to NASA:

"The NASA Deep Space Network - or DSN - is an international network of antennas that supports interplanetary spacecraft missions and radio and radar astronomy observations for the exploration of the solar system and the universe. The network also supports selected Earth-orbiting missions.

"The DSN currently consists of three deep-space communications facilities placed approximately 120 degrees apart around the world: at Goldstone, in California's Mojave Desert; near Madrid, Spain; and near Canberra, Australia. This strategic placement permits constant observation of spacecraft as the Earth rotates, and helps to make the DSN the largest and most sensitive scientific telecommunications system in the world."

Frequency Bands
Band	Use	Service	Table
25.5 - 27 GHz	DSN K-Band Downlink (from spacecraft less than 2 million km from Earth)	Space Research (space-to-Earth)	F

Paired Frequency Bands
Paired Bands	Use	Service	Table
2025 - 2110 MHz	DSN S-Band Uplink (to spacecraft less than 2 million km from Earth)	Space Research (Earth-to-space)	F
2200 - 2290 MHz	DSN S-Band Downlink (from spacecraft less than 2 million km from Earth)	Space Research (space-to-Earth)	F
2110 - 2120 MHz	DSN S-Band Uplink (to spacecraft more than 2 million km from Earth)	Space Research (Earth-to-space)	F
2290 - 2300 MHz	DSN S-Band Downlink (from spacecraft more than 2 million km from Earth)	Space Research (deep space)	F
7145 - 7190 MHz	DSN X-Band Uplink (to spacecraft more than 2 million km from Earth)	Space Research (Earth-to-space)	F
8400 - 8450 MHz	DSN X-Band Downlink (from spacecraft more than 2 million km from Earth)	Space Research (deep space)	F
7190 - 7235 MHz	DSN X-Band Uplink (to spacecraft less than 2 million km from Earth)	Space Research (Earth-to-space)	F
8450 - 8500 MHz	DSN X-Band Downlink (from spacecraft less than 2 million km from Earth)	Space Research (space-to-Earth)	F
31.8 - 32.3 GHz	DSN Ka-Band Downlink (from spacecraft more than 2 million km from Earth)	Space Research (deep space)	F
34.2 - 34.7 GHz	DSN Ka-Band Uplink (to spacecraft more than 2 million km from Earth)	Space Research (Earth-to-space)	F

External Links:

NASA Deep Space Network

NASA DSN Frequency and Channel Assignments (DSN 810-005 part 201)

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Wideband Global SATCOM (WGS) System

The Wideband Global SATCOM (WGS) System provides fixed site satellite service at X-band and Ka-band from geosynchronous earth orbit in support of US military operations worldwide.

As of April 2013, four WGS satellites are in orbit, a fifth is scheduled for launch in 2013, a sixth has completed testing, and four more are being built.

Paired Frequency Bands
Paired Bands	Use	Service	Table
7250 - 7750 MHz	X-band downlink	Fixed-satellite	F
7900 - 8400 MHz	X-band uplink	Fixed-satellite	F
20.2 - 21.2 GHz	Ka-band downlink	Fixed-satellite	-
30 - 31 GHz	Ka-band uplink	Fixed-satellite	-

External Links:

WGS Article on Wikipedia

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Defense Satellite Communication System 3 (DSCS III)

According to the U.S. Space Force:

Defense Satellite Communications System (DSCS) constellation provides long haul communications to users worldwide through contested environments.

DSCS supports: the defense communications system, the military’s ground mobile forces, airborne terminals, ships at sea, and Department of Defense (DOD).

The first DSCS III satellite was launched in October 1982. The final DSCS III satellite, B6, was launched in August 2003. In all, DSCS III successfully launched 14 satellites, six of which are still operational and continue to be used in various capacities, from operational communications in Southwest Asia to research and development of ground-based support capabilities.

Space and Missile Systems Center (SMC), Los Angeles Air Force Base, Calif., sustains the DSCS Space Segment contract.

DSCS III satellites support globally distributed DOD and national security users. Modifications made to these satellites will provide substantial capacity improvements through higher power amplifiers, more sensitive receivers, and additional antenna connectivity options. The DSCS communications payload includes six independent Super High Frequency (SHF) transponder channels. Three receive and five transmit antennas provide selectable options for Earth coverage, area coverage and/or spot beam coverage. A special purpose single-channel transponder is also on board.

DSCS satellites provide the capabilities needed for effective implementation of worldwide military communications. It can adapt rapidly to dynamic operating conditions and perform under stressed environments. DSCS operates with large or small terminals. DSCS’s independent channels group users by operational needs or geographical location by allocating receiver sensitivity and transmitter power, thus providing maximum efficiency.

Paired Frequency Bands
Paired Bands	Use	Service	Table
7250 - 7750 MHz	DSCS III downlink	Mobile-satellite	F
7900 - 8400 MHz	DSCS III uplink	Mobile-satellite	F

Frequencies
Frequency	Bandwidth	Use	Service	Table
7600 MHz	-	DSCS III Beacon (A series satellites)	Mobile-satellite	F
7604.705882 MHz	-	DSCS III Beacon (B series satellites)	Mobile-satellite	F
8005.146484 MHz	-	DSCS III Channel 1 command uplink	Mobile-satellite	F
8370.146484 MHz	-	DSCS III Channel 5 command uplink	Mobile-satellite	F

External Links:

DSCS-3 (Gunter's Space Page)

DSCS-3 (fas.org)

DSCS III (Space Force)

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Possible new FSS and maritime mobile-satellite allocations, 2015 World Radiocommunication Conference (WRC-15) Agenda Item 1.9

1.9 to consider, in accordance with Resolution COM6/15 (WRC-12):

1.9.1 possible new allocations to the fixed-satellite service in the frequency bands 7 150-7 250 MHz (space-to-Earth) and 8 400-8 500 MHz (Earth-to-space), subject to appropriate sharing conditions;

1.9.2 the possibility of allocating the bands 7 375-7 750 MHz and 8 025-8 400 MHz to the maritime-mobile satellite service and additional regulatory measures, depending on the results of appropriate studies

Frequency Bands
Band	Use	Service	Table
7150 - 7250 MHz	WRC-15 Agenda Item 1.9.1	Fixed-satellite (space-to-Earth)	-
8400 - 8500 MHz	WRC-15 Agenda Item 1.9.1	Fixed-satellite (Earth-to-space)	-

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Possible allocations for FSS and maritime mobile-satellite service, 2015 World Radiocommunication Conference (WRC-15) Agenda Item 1.9

Frequency Bands
Band	Use	Service	Table
7150 - 7250 MHz	Agenda Item 1.9.1	Fixed-satellite (space-to-Earth)	-
7375 - 7750 MHz	Agenda Item 1.9.2 (maritime mobile-satellite)	Mobile-satellite	-
8025 - 8400 MHz	Agenda Item 1.9.2 (maritime mobile-satellite)	Mobile-satellite	-
8400 - 8500 MHz	Agenda Item 1.9.1	Fixed-satellite (Earth-to-space)	-

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Engineering Data

	Lower Frequency	Center Frequency	Upper Frequency
Frequency	8.4 GHz	8.45 GHz	8.5 GHz
Wavelength	3.6 cm	3.5 cm	3.5 cm
Band designator(s)	SHF; X-band (IEEE)	SHF; X-band (IEEE)	SHF; X-band (IEEE)
Isotropic collecting area	1.0 cm²	1.0 cm²	1.0 cm²
Free space loss (1 m)	50.9 dB	51.0 dB	51.0 dB
Free space loss (1 km)	110.9 dB	111.0 dB	111.0 dB
Free space loss (10 km)	130.9 dB	131.0 dB	131.0 dB
Free space loss (100 km)	150.9 dB	151.0 dB	151.0 dB
Free space loss (1000 km)	170.9 dB	171.0 dB	171.0 dB
Free space loss (35,786 km = GEO orbit)	202.0 dB	202.1 dB	202.1 dB
Free space loss (378,370 km = Moon)	222.5 dB	222.5 dB	222.6 dB